478 lines
56 KiB
HTML
478 lines
56 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
|
|
<title>Mu's instructions and their table-driven translation</title>
|
|
<meta name="Generator" content="Vim/8.1">
|
|
<meta name="plugin-version" content="vim8.1_v1">
|
|
<meta name="syntax" content="none">
|
|
<meta name="settings" content="use_css,no_foldcolumn,expand_tabs,prevent_copy=">
|
|
<meta name="colorscheme" content="minimal-light">
|
|
<style type="text/css">
|
|
<!--
|
|
pre { font-family: monospace; color: #000000; background-color: #ffffd7; }
|
|
body { font-family: monospace; color: #000000; background-color: #ffffd7; }
|
|
* { font-size: 1em; }
|
|
.muRegEbx { color: #5f00ff; }
|
|
.muRegEdi { color: #00af00; }
|
|
.muComment { color: #005faf; }
|
|
.PreProc { color: #c000c0; }
|
|
.muRegEsi { color: #005faf; }
|
|
.Delimiter { color: #c000c0; }
|
|
.Constant { color: #008787; }
|
|
.Special { color: #ff6060; }
|
|
.muRegEcx { color: #870000; }
|
|
.muRegEdx { color: #af5f00; }
|
|
-->
|
|
</style>
|
|
</head>
|
|
<body>
|
|
<pre id='vimCodeElement'>
|
|
<span class="muComment">## Mu's instructions and their table-driven translation</span>
|
|
|
|
See <a href="http://akkartik.name/akkartik-convivial-20200607.pdf">http://akkartik.name/akkartik-convivial-20200607.pdf</a> for the complete
|
|
story. In brief: Mu is a memory-safe statement-oriented language where most
|
|
statements translate to a single instruction of machine code. Blocks consist of
|
|
flat lists of instructions. Instructions can have inputs after the operation,
|
|
and outputs to the left of a '<span class="Special"><-</span>'. Inputs and outputs must be variables. They
|
|
can't include nested expressions. Variables can be literals ('n'), or live in a
|
|
register ('var/reg') or in memory ('var') at some 'stack-offset' from the 'ebp'
|
|
register. Outputs must be registers. To modify a variable in memory, pass it in
|
|
by reference as an input. (Inputs are more precisely called 'inouts'.)
|
|
Conversely, registers that are just read from must not be passed as outputs.
|
|
|
|
The following chart shows all the instruction forms supported by Mu, along with
|
|
the SubX instruction they're translated to.
|
|
|
|
<span class="muComment">## Integer instructions</span>
|
|
|
|
These instructions use the general-purpose registers.
|
|
|
|
var/eax <span class="Special"><-</span> increment => <span class="Constant">"40/increment-eax"</span>
|
|
var/<span class="muRegEcx">ecx</span> <span class="Special"><-</span> increment => <span class="Constant">"41/increment-ecx"</span>
|
|
var/<span class="muRegEdx">edx</span> <span class="Special"><-</span> increment => <span class="Constant">"42/increment-edx"</span>
|
|
var/<span class="muRegEbx">ebx</span> <span class="Special"><-</span> increment => <span class="Constant">"43/increment-ebx"</span>
|
|
var/<span class="muRegEsi">esi</span> <span class="Special"><-</span> increment => <span class="Constant">"46/increment-esi"</span>
|
|
var/<span class="muRegEdi">edi</span> <span class="Special"><-</span> increment => <span class="Constant">"47/increment-edi"</span>
|
|
increment var => <span class="Constant">"ff 0/subop/increment *(ebp+"</span> var.stack-offset <span class="Constant">")"</span>
|
|
increment *var/reg => <span class="Constant">"ff 0/subop/increment *"</span> reg
|
|
|
|
var/eax <span class="Special"><-</span> decrement => <span class="Constant">"48/decrement-eax"</span>
|
|
var/<span class="muRegEcx">ecx</span> <span class="Special"><-</span> decrement => <span class="Constant">"49/decrement-ecx"</span>
|
|
var/<span class="muRegEdx">edx</span> <span class="Special"><-</span> decrement => <span class="Constant">"4a/decrement-edx"</span>
|
|
var/<span class="muRegEbx">ebx</span> <span class="Special"><-</span> decrement => <span class="Constant">"4b/decrement-ebx"</span>
|
|
var/<span class="muRegEsi">esi</span> <span class="Special"><-</span> decrement => <span class="Constant">"4e/decrement-esi"</span>
|
|
var/<span class="muRegEdi">edi</span> <span class="Special"><-</span> decrement => <span class="Constant">"4f/decrement-edi"</span>
|
|
decrement var => <span class="Constant">"ff 1/subop/decrement *(ebp+"</span> var.stack-offset <span class="Constant">")"</span>
|
|
decrement *var/reg => <span class="Constant">"ff 1/subop/decrement *"</span> reg
|
|
|
|
var/reg <span class="Special"><-</span> add var2/reg2 => <span class="Constant">"01/add-to %"</span> reg <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> add var2 => <span class="Constant">"03/add *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> add *var2/reg2 => <span class="Constant">"03/add *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
add-to var1, var2/reg => <span class="Constant">"01/add-to *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
add-to *var1/reg1, var2/reg2 => <span class="Constant">"01/add-to *"</span> reg1 <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
var/eax <span class="Special"><-</span> add n => <span class="Constant">"05/add-to-eax "</span> n <span class="Constant">"/imm32"</span>
|
|
var/reg <span class="Special"><-</span> add n => <span class="Constant">"81 0/subop/add %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
add-to var, n => <span class="Constant">"81 0/subop/add *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
|
|
add-to *var/reg, n => <span class="Constant">"81 0/subop/add *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
|
|
var/reg <span class="Special"><-</span> subtract var2/reg2 => <span class="Constant">"29/subtract-from %"</span> reg <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> subtract var2 => <span class="Constant">"2b/subtract *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> subtract *var2/reg2 => <span class="Constant">"2b/subtract *"</span> reg2 <span class="Constant">" "</span> reg1 <span class="Constant">"/r32"</span>
|
|
subtract-from var1, var2/reg2 => <span class="Constant">"29/subtract-from *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> reg2 <span class="Constant">"/r32"</span>
|
|
subtract-from *var1/reg1, var2/reg2 => <span class="Constant">"29/subtract-from *"</span> reg1 <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
var/eax <span class="Special"><-</span> subtract n => <span class="Constant">"2d/subtract-from-eax "</span> n <span class="Constant">"/imm32"</span>
|
|
var/reg <span class="Special"><-</span> subtract n => <span class="Constant">"81 5/subop/subtract %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
subtract-from var, n => <span class="Constant">"81 5/subop/subtract *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
|
|
subtract-from *var/reg, n => <span class="Constant">"81 5/subop/subtract *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
|
|
var/reg <span class="Special"><-</span> and var2/reg2 => <span class="Constant">"21/and-with %"</span> reg <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> and var2 => <span class="Constant">"23/and *(ebp+"</span> var2.stack-offset <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> and *var2/reg2 => <span class="Constant">"23/and *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
and-with var1, var2/reg => <span class="Constant">"21/and-with *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
and-with *var1/reg1, var2/reg2 => <span class="Constant">"21/and-with *"</span> reg1 <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
var/eax <span class="Special"><-</span> and n => <span class="Constant">"25/and-with-eax "</span> n <span class="Constant">"/imm32"</span>
|
|
var/reg <span class="Special"><-</span> and n => <span class="Constant">"81 4/subop/and %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
and-with var, n => <span class="Constant">"81 4/subop/and *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
|
|
and-with *var/reg, n => <span class="Constant">"81 4/subop/and *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
|
|
var/reg <span class="Special"><-</span> or var2/reg2 => <span class="Constant">"09/or-with %"</span> reg <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> or var2 => <span class="Constant">"0b/or *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> or *var2/reg2 => <span class="Constant">"0b/or *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
or-with var1, var2/reg2 => <span class="Constant">"09/or-with *(ebp+"</span> var1.stack-offset <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
or-with *var1/reg1, var2/reg2 => <span class="Constant">"09/or-with *"</span> reg1 <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
var/eax <span class="Special"><-</span> or n => <span class="Constant">"0d/or-with-eax "</span> n <span class="Constant">"/imm32"</span>
|
|
var/reg <span class="Special"><-</span> or n => <span class="Constant">"81 1/subop/or %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
or-with var, n => <span class="Constant">"81 1/subop/or *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
|
|
or-with *var/reg, n => <span class="Constant">"81 1/subop/or *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
|
|
var/reg <span class="Special"><-</span> not => <span class="Constant">"f7 2/subop/not %"</span> reg
|
|
not var => <span class="Constant">"f7 2/subop/not *(ebp+"</span> var.stack-offset <span class="Constant">")"</span>
|
|
not *var/reg => <span class="Constant">"f7 2/subop/not *"</span> reg
|
|
|
|
var/reg <span class="Special"><-</span> xor var2/reg2 => <span class="Constant">"31/xor-with %"</span> reg <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> xor var2 => <span class="Constant">"33/xor *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> xor *var2/reg2 => <span class="Constant">"33/xor *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
xor-with var1, var2/reg => <span class="Constant">"31/xor-with *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
xor-with *var1/reg1, var2/reg2 => <span class="Constant">"31/xor-with *"</span> reg1 <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
var/eax <span class="Special"><-</span> xor n => <span class="Constant">"35/xor-with-eax "</span> n <span class="Constant">"/imm32"</span>
|
|
var/reg <span class="Special"><-</span> xor n => <span class="Constant">"81 6/subop/xor %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
xor-with var, n => <span class="Constant">"81 6/subop/xor *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
|
|
xor-with *var/reg, n => <span class="Constant">"81 6/subop/xor *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
|
|
var/reg <span class="Special"><-</span> negate => <span class="Constant">"f7 3/subop/negate %"</span> reg
|
|
negate var => <span class="Constant">"f7 3/subop/negate *(ebp+"</span> var.stack-offset <span class="Constant">")"</span>
|
|
negate *var/reg => <span class="Constant">"f7 3/subop/negate *"</span> reg
|
|
|
|
var/reg <span class="Special"><-</span> shift-left n => <span class="Constant">"c1/shift 4/subop/left %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
var/reg <span class="Special"><-</span> shift-right n => <span class="Constant">"c1/shift 5/subop/right %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
var/reg <span class="Special"><-</span> shift-right-signed n => <span class="Constant">"c1/shift 7/subop/right-signed %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
shift-left var, n => <span class="Constant">"c1/shift 4/subop/left *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
|
|
shift-left *var/reg, n => <span class="Constant">"c1/shift 4/subop/left *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
shift-right var, n => <span class="Constant">"c1/shift 5/subop/right *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
|
|
shift-right *var/reg, n => <span class="Constant">"c1/shift 5/subop/right *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
shift-right-signed var, n => <span class="Constant">"c1/shift 7/subop/right-signed *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
|
|
shift-right-signed *var/reg, n => <span class="Constant">"c1/shift 7/subop/right-signed *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
|
|
var/eax <span class="Special"><-</span> copy n => <span class="Constant">"b8/copy-to-eax "</span> n <span class="Constant">"/imm32"</span>
|
|
var/<span class="muRegEcx">ecx</span> <span class="Special"><-</span> copy n => <span class="Constant">"b9/copy-to-ecx "</span> n <span class="Constant">"/imm32"</span>
|
|
var/<span class="muRegEdx">edx</span> <span class="Special"><-</span> copy n => <span class="Constant">"ba/copy-to-edx "</span> n <span class="Constant">"/imm32"</span>
|
|
var/<span class="muRegEbx">ebx</span> <span class="Special"><-</span> copy n => <span class="Constant">"bb/copy-to-ebx "</span> n <span class="Constant">"/imm32"</span>
|
|
var/<span class="muRegEsi">esi</span> <span class="Special"><-</span> copy n => <span class="Constant">"be/copy-to-esi "</span> n <span class="Constant">"/imm32"</span>
|
|
var/<span class="muRegEdi">edi</span> <span class="Special"><-</span> copy n => <span class="Constant">"bf/copy-to-edi "</span> n <span class="Constant">"/imm32"</span>
|
|
var/reg <span class="Special"><-</span> copy var2/reg2 => <span class="Constant">"89/<- %"</span> reg <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
copy-to var1, var2/reg => <span class="Constant">"89/<- *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
copy-to *var1/reg1, var2/reg2 => <span class="Constant">"89/<- *"</span> reg1 <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> copy var2 => <span class="Constant">"8b/-> *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> copy *var2/reg2 => <span class="Constant">"8b/-> *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> copy n => <span class="Constant">"c7 0/subop/copy %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
copy-to var, n => <span class="Constant">"c7 0/subop/copy *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
|
|
copy-to *var/reg, n => <span class="Constant">"c7 0/subop/copy *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
|
|
var/reg <span class="Special"><-</span> copy-byte var2/reg2 => <span class="Constant">"8a/byte-> %"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
<span class="Constant">"81 4/subop/and %"</span> reg <span class="Constant">" 0xff/imm32"</span>
|
|
var/reg <span class="Special"><-</span> copy-byte *var2/reg2 => <span class="Constant">"8a/byte-> *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
<span class="Constant">"81 4/subop/and %"</span> reg <span class="Constant">" 0xff/imm32"</span>
|
|
copy-byte-to *var1/reg1, var2/reg2 => <span class="Constant">"88/byte<- *"</span> reg1 <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
|
|
compare var1, var2/reg2 => <span class="Constant">"39/compare *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> reg2 <span class="Constant">"/r32"</span>
|
|
compare *var1/reg1, var2/reg2 => <span class="Constant">"39/compare *"</span> reg1 <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
|
|
compare var1/reg1, var2 => <span class="Constant">"3b/compare<- *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg1 <span class="Constant">"/r32"</span>
|
|
compare var/reg, *var2/reg2 => <span class="Constant">"3b/compare<- *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
compare var/eax, n => <span class="Constant">"3d/compare-eax-with "</span> n <span class="Constant">"/imm32"</span>
|
|
compare var/reg, n => <span class="Constant">"81 7/subop/compare %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
compare var, n => <span class="Constant">"81 7/subop/compare *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
|
|
compare *var/reg, n => <span class="Constant">"81 7/subop/compare *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
|
|
|
|
var/reg <span class="Special"><-</span> multiply var2 => <span class="Constant">"0f af/multiply *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> multiply var2/reg2 => <span class="Constant">"0f af/multiply %"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> multiply *var2/reg2 => <span class="Constant">"0f af/multiply *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
|
|
<span class="muComment">## Floating-point operations</span>
|
|
|
|
These instructions operate on either floating-point registers (xreg) or
|
|
general-purpose registers (reg) in indirect mode.
|
|
|
|
var/xreg <span class="Special"><-</span> add var2/xreg2 => <span class="Constant">"f3 0f 58/add %"</span> xreg2 <span class="Constant">" "</span> xreg1 <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> add var2 => <span class="Constant">"f3 0f 58/add *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> add *var2/reg2 => <span class="Constant">"f3 0f 58/add *"</span> reg2 <span class="Constant">" "</span> xreg <span class="Constant">"/x32"</span>
|
|
|
|
var/xreg <span class="Special"><-</span> subtract var2/xreg2 => <span class="Constant">"f3 0f 5c/subtract %"</span> xreg2 <span class="Constant">" "</span> xreg1 <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> subtract var2 => <span class="Constant">"f3 0f 5c/subtract *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> subtract *var2/reg2 => <span class="Constant">"f3 0f 5c/subtract *"</span> reg2 <span class="Constant">" "</span> xreg <span class="Constant">"/x32"</span>
|
|
|
|
var/xreg <span class="Special"><-</span> multiply var2/xreg2 => <span class="Constant">"f3 0f 59/multiply %"</span> xreg2 <span class="Constant">" "</span> xreg1 <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> multiply var2 => <span class="Constant">"f3 0f 59/multiply *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> multiply *var2/reg2 => <span class="Constant">"f3 0f 59/multiply *"</span> reg2 <span class="Constant">" "</span> xreg <span class="Constant">"/x32"</span>
|
|
|
|
var/xreg <span class="Special"><-</span> divide var2/xreg2 => <span class="Constant">"f3 0f 5e/divide %"</span> xreg2 <span class="Constant">" "</span> xreg1 <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> divide var2 => <span class="Constant">"f3 0f 5e/divide *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> divide *var2/reg2 => <span class="Constant">"f3 0f 5e/divide *"</span> reg2 <span class="Constant">" "</span> xreg <span class="Constant">"/x32"</span>
|
|
|
|
There are also some exclusively floating-point instructions:
|
|
|
|
var/xreg <span class="Special"><-</span> reciprocal var2/xreg2 => <span class="Constant">"f3 0f 53/reciprocal %"</span> xreg2 <span class="Constant">" "</span> xreg1 <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> reciprocal var2 => <span class="Constant">"f3 0f 53/reciprocal *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> reciprocal *var2/reg2 => <span class="Constant">"f3 0f 53/reciprocal *"</span> reg2 <span class="Constant">" "</span> xreg <span class="Constant">"/x32"</span>
|
|
|
|
var/xreg <span class="Special"><-</span> square-root var2/xreg2 => <span class="Constant">"f3 0f 51/square-root %"</span> xreg2 <span class="Constant">" "</span> xreg1 <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> square-root var2 => <span class="Constant">"f3 0f 51/square-root *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> square-root *var2/reg2 => <span class="Constant">"f3 0f 51/square-root *"</span> reg2 <span class="Constant">" "</span> xreg <span class="Constant">"/x32"</span>
|
|
|
|
var/xreg <span class="Special"><-</span> inverse-square-root var2/xreg2 => <span class="Constant">"f3 0f 52/inverse-square-root %"</span> xreg2 <span class="Constant">" "</span> xreg1 <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> inverse-square-root var2 => <span class="Constant">"f3 0f 52/inverse-square-root *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> inverse-square-root *var2/reg2 => <span class="Constant">"f3 0f 52/inverse-square-root *"</span> reg2 <span class="Constant">" "</span> xreg <span class="Constant">"/x32"</span>
|
|
|
|
var/xreg <span class="Special"><-</span> min var2/xreg2 => <span class="Constant">"f3 0f 5d/min %"</span> xreg2 <span class="Constant">" "</span> xreg1 <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> min var2 => <span class="Constant">"f3 0f 5d/min *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> min *var2/reg2 => <span class="Constant">"f3 0f 5d/min *"</span> reg2 <span class="Constant">" "</span> xreg <span class="Constant">"/x32"</span>
|
|
|
|
var/xreg <span class="Special"><-</span> max var2/xreg2 => <span class="Constant">"f3 0f 5f/max %"</span> xreg2 <span class="Constant">" "</span> xreg1 <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> max var2 => <span class="Constant">"f3 0f 5f/max *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> max *var2/reg2 => <span class="Constant">"f3 0f 5f/max *"</span> reg2 <span class="Constant">" "</span> xreg <span class="Constant">"/x32"</span>
|
|
|
|
Remember, when these instructions use indirect mode, they still use an integer
|
|
register. Floating-point registers can't hold addresses.
|
|
|
|
Most instructions operate exclusively on integer or floating-point operands.
|
|
The only exceptions are the instructions for converting between integers and
|
|
floating-point numbers.
|
|
|
|
var/xreg <span class="Special"><-</span> convert var2/reg2 => <span class="Constant">"f3 0f 2a/convert-to-float %"</span> reg2 <span class="Constant">" "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> convert var2 => <span class="Constant">"f3 0f 2a/convert-to-float *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> convert *var2/reg2 => <span class="Constant">"f3 0f 2a/convert-to-float *"</span> reg2 <span class="Constant">" "</span> xreg <span class="Constant">"/x32"</span>
|
|
|
|
Converting floats to ints performs rounding by default. (We don't mess with the
|
|
MXCSR control register.)
|
|
|
|
var/reg <span class="Special"><-</span> convert var2/xreg2 => <span class="Constant">"f3 0f 2d/convert-to-int %"</span> xreg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> convert var2 => <span class="Constant">"f3 0f 2d/convert-to-int *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> convert *var2/reg2 => <span class="Constant">"f3 0f 2d/convert-to-int *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
|
|
There's a separate instruction for truncating the fractional part.
|
|
|
|
var/reg <span class="Special"><-</span> truncate var2/xreg2 => <span class="Constant">"f3 0f 2c/truncate-to-int %"</span> xreg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> truncate var2 => <span class="Constant">"f3 0f 2c/truncate-to-int *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg <span class="Special"><-</span> truncate *var2/reg2 => <span class="Constant">"f3 0f 2c/truncate-to-int *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
|
|
There are no instructions accepting floating-point literals. To obtain integer
|
|
literals in floating-point registers, copy them to general-purpose registers
|
|
and then convert them to floating-point.
|
|
|
|
One pattern you may have noticed above is that the floating-point instructions
|
|
above always write to registers. The only exceptions are `copy` instructions,
|
|
which can write to memory locations.
|
|
|
|
var/xreg <span class="Special"><-</span> copy var2/xreg2 => <span class="Constant">"f3 0f 11/<- %"</span> xreg <span class="Constant">" "</span> xreg2 <span class="Constant">"/x32"</span>
|
|
copy-to var1, var2/xreg => <span class="Constant">"f3 0f 11/<- *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> copy var2 => <span class="Constant">"f3 0f 10/-> *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> xreg <span class="Constant">"/x32"</span>
|
|
var/xreg <span class="Special"><-</span> copy *var2/reg2 => <span class="Constant">"f3 0f 10/-> *"</span> reg2 <span class="Constant">" "</span> xreg <span class="Constant">"/x32"</span>
|
|
|
|
Comparisons must always start with a register:
|
|
|
|
compare var1/xreg1, var2/xreg2 => <span class="Constant">"0f 2f/compare %"</span> xreg2 <span class="Constant">" "</span> xreg1 <span class="Constant">"/x32"</span>
|
|
compare var1/xreg1, var2 => <span class="Constant">"0f 2f/compare *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> xreg1 <span class="Constant">"/x32"</span>
|
|
|
|
<span class="muComment">## Blocks</span>
|
|
|
|
In themselves, blocks generate no instructions. However, if a block contains
|
|
variable declarations, they must be cleaned up when the block ends.
|
|
|
|
Clean up var on the stack => <span class="Constant">"81 0/subop/add %esp "</span> size-of(var) <span class="Constant">"/imm32"</span>
|
|
Clean up var/reg => <span class="Constant">"8f 0/subop/pop %"</span> reg
|
|
|
|
Clean up var/xreg => <span class="Constant">"f3 0f 10/-> *esp "</span> xreg <span class="Constant">"/x32"</span>
|
|
<span class="Constant">"81 0/subop/add %esp 4/imm32"</span>
|
|
|
|
<span class="muComment">## Jumps</span>
|
|
|
|
Besides having to clean up any variable declarations (see above) between
|
|
themselves and their target, jumps translate like this:
|
|
|
|
<span class="PreProc">break</span> => <span class="Constant">"e9/jump break/disp32"</span>
|
|
<span class="PreProc">break</span> label => <span class="Constant">"e9/jump "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop</span> => <span class="Constant">"e9/jump loop/disp32"</span>
|
|
<span class="PreProc">loop</span> label => <span class="Constant">"e9/jump "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
<span class="PreProc">break-if-=</span> => <span class="Constant">"0f 84/jump-if-= break/disp32"</span>
|
|
<span class="PreProc">break-if-=</span> label => <span class="Constant">"0f 84/jump-if-= "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop-if-=</span> => <span class="Constant">"0f 84/jump-if-= loop/disp32"</span>
|
|
<span class="PreProc">loop-if-=</span> label => <span class="Constant">"0f 84/jump-if-= "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
<span class="PreProc">break-if-!=</span> => <span class="Constant">"0f 85/jump-if-!= break/disp32"</span>
|
|
<span class="PreProc">break-if-!=</span> label => <span class="Constant">"0f 85/jump-if-!= "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop-if-!=</span> => <span class="Constant">"0f 85/jump-if-!= loop/disp32"</span>
|
|
<span class="PreProc">loop-if-!=</span> label => <span class="Constant">"0f 85/jump-if-!= "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
<span class="PreProc">break-if-<</span> => <span class="Constant">"0f 8c/jump-if-< break/disp32"</span>
|
|
<span class="PreProc">break-if-<</span> label => <span class="Constant">"0f 8c/jump-if-< "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop-if-<</span> => <span class="Constant">"0f 8c/jump-if-< loop/disp32"</span>
|
|
<span class="PreProc">loop-if-<</span> label => <span class="Constant">"0f 8c/jump-if-< "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
<span class="PreProc">break-if-></span> => <span class="Constant">"0f 8f/jump-if-> break/disp32"</span>
|
|
<span class="PreProc">break-if-></span> label => <span class="Constant">"0f 8f/jump-if-> "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop-if-></span> => <span class="Constant">"0f 8f/jump-if-> loop/disp32"</span>
|
|
<span class="PreProc">loop-if-></span> label => <span class="Constant">"0f 8f/jump-if-> "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
<span class="PreProc">break-if-<=</span> => <span class="Constant">"0f 8e/jump-if-<= break/disp32"</span>
|
|
<span class="PreProc">break-if-<=</span> label => <span class="Constant">"0f 8e/jump-if-<= "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop-if-<=</span> => <span class="Constant">"0f 8e/jump-if-<= loop/disp32"</span>
|
|
<span class="PreProc">loop-if-<=</span> label => <span class="Constant">"0f 8e/jump-if-<= "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
<span class="PreProc">break-if->=</span> => <span class="Constant">"0f 8d/jump-if->= break/disp32"</span>
|
|
<span class="PreProc">break-if->=</span> label => <span class="Constant">"0f 8d/jump-if->= "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop-if->=</span> => <span class="Constant">"0f 8d/jump-if->= loop/disp32"</span>
|
|
<span class="PreProc">loop-if->=</span> label => <span class="Constant">"0f 8d/jump-if->= "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
<span class="PreProc">break-if-addr<</span> => <span class="Constant">"0f 82/jump-if-addr< break/disp32"</span>
|
|
<span class="PreProc">break-if-addr<</span> label => <span class="Constant">"0f 82/jump-if-addr< "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop-if-addr<</span> => <span class="Constant">"0f 82/jump-if-addr< loop/disp32"</span>
|
|
<span class="PreProc">loop-if-addr<</span> label => <span class="Constant">"0f 82/jump-if-addr< "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
<span class="PreProc">break-if-addr></span> => <span class="Constant">"0f 87/jump-if-addr> break/disp32"</span>
|
|
<span class="PreProc">break-if-addr></span> label => <span class="Constant">"0f 87/jump-if-addr> "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop-if-addr></span> => <span class="Constant">"0f 87/jump-if-addr> loop/disp32"</span>
|
|
<span class="PreProc">loop-if-addr></span> label => <span class="Constant">"0f 87/jump-if-addr> "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
<span class="PreProc">break-if-addr<=</span> => <span class="Constant">"0f 86/jump-if-addr<= break/disp32"</span>
|
|
<span class="PreProc">break-if-addr<=</span> label => <span class="Constant">"0f 86/jump-if-addr<= "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop-if-addr<=</span> => <span class="Constant">"0f 86/jump-if-addr<= loop/disp32"</span>
|
|
<span class="PreProc">loop-if-addr<=</span> label => <span class="Constant">"0f 86/jump-if-addr<= "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
<span class="PreProc">break-if-addr>=</span> => <span class="Constant">"0f 83/jump-if-addr>= break/disp32"</span>
|
|
<span class="PreProc">break-if-addr>=</span> label => <span class="Constant">"0f 83/jump-if-addr>= "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop-if-addr>=</span> => <span class="Constant">"0f 83/jump-if-addr>= loop/disp32"</span>
|
|
<span class="PreProc">loop-if-addr>=</span> label => <span class="Constant">"0f 83/jump-if-addr>= "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
Similar float variants like `<span class="PreProc">break-if-float<`</span> are aliases for the corresponding
|
|
`addr` equivalents. The x86 instruction set stupidly has floating-point
|
|
operations only update a subset of flags.
|
|
|
|
Four sets of conditional jumps are useful for detecting overflow.
|
|
|
|
<span class="PreProc">break-if-carry</span> => <span class="Constant">"0f 82/jump-if-carry break/disp32"</span>
|
|
<span class="PreProc">break-if-carry</span> label => <span class="Constant">"0f 82/jump-if-carry "</span> label <span class="Constant">"/disp32"</span>
|
|
<span class="PreProc">loop-if-carry</span> => <span class="Constant">"0f 82/jump-if-carry break/disp32"</span>
|
|
<span class="PreProc">loop-if-carry</span> label => <span class="Constant">"0f 82/jump-if-carry "</span> label <span class="Constant">"/disp32"</span>
|
|
|
|
<span class="PreProc">break-if-not-carry</span> => <span class="Constant">"0f 83/jump-if-not-carry break/disp32"</span>
|
|
<span class="PreProc">break-if-not-carry</span> label => <span class="Constant">"0f 83/jump-if-not-carry "</span> label <span class="Constant">"/disp32"</span>
|
|
<span class="PreProc">loop-if-not-carry</span> => <span class="Constant">"0f 83/jump-if-not-carry break/disp32"</span>
|
|
<span class="PreProc">loop-if-not-carry</span> label => <span class="Constant">"0f 83/jump-if-not-carry "</span> label <span class="Constant">"/disp32"</span>
|
|
|
|
<span class="PreProc">break-if-overflow</span> => <span class="Constant">"0f 80/jump-if-overflow break/disp32"</span>
|
|
<span class="PreProc">break-if-overflow</span> label => <span class="Constant">"0f 80/jump-if-overflow "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop-if-overflow</span> => <span class="Constant">"0f 80/jump-if-overflow loop/disp32"</span>
|
|
<span class="PreProc">loop-if-overflow</span> label => <span class="Constant">"0f 80/jump-if-overflow "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
<span class="PreProc">break-if-not-overflow</span> => <span class="Constant">"0f 81/jump-if-not-overflow break/disp32"</span>
|
|
<span class="PreProc">break-if-not-overflow</span> label => <span class="Constant">"0f 81/jump-if-not-overflow "</span> label <span class="Constant">":break/disp32"</span>
|
|
<span class="PreProc">loop-if-not-overflow</span> => <span class="Constant">"0f 81/jump-if-not-overflow loop/disp32"</span>
|
|
<span class="PreProc">loop-if-not-overflow</span> label => <span class="Constant">"0f 81/jump-if-not-overflow "</span> label <span class="Constant">":loop/disp32"</span>
|
|
|
|
All this relies on a convention that every `<span class="Delimiter">{}</span>` block is delimited by labels
|
|
ending in `:<span class="PreProc">loop</span>` and `:<span class="PreProc">break</span>`.
|
|
|
|
<span class="muComment">## Returns</span>
|
|
|
|
The `<span class="PreProc">return</span>` instruction cleans up variable declarations just like an unconditional
|
|
`<span class="PreProc">jump</span>` to end of function, but also emits a series of copies before the final
|
|
`<span class="PreProc">jump</span>`, copying each argument of `<span class="PreProc">return</span>` to the register appropriate to the
|
|
respective function output. This doesn't work if a function output register
|
|
contains a later `<span class="PreProc">return</span>` argument (e.g. if the registers for two outputs are
|
|
swapped in `<span class="PreProc">return</span>`), so you can't do that.
|
|
|
|
<span class="PreProc">return</span> => <span class="Constant">"c3/return"</span>
|
|
|
|
---
|
|
|
|
In the following instructions types are provided for clarity even if they must
|
|
be provided in an earlier 'var' declaration.
|
|
|
|
<span class="muComment"># Address operations</span>
|
|
|
|
var/reg: (addr T) <span class="Special"><-</span> address var2: T
|
|
=> <span class="Constant">"8d/copy-address *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
|
|
<span class="muComment"># Array operations</span>
|
|
|
|
var/reg: (addr T) <span class="Special"><-</span> index arr/rega: (addr array T), idx/regi: int
|
|
| if size-of(T) is <span class="Constant">1</span>, <span class="Constant">2</span>, <span class="Constant">4</span> or <span class="Constant">8</span>
|
|
=> <span class="Constant">"81 7/subop/compare %"</span> rega <span class="Constant">" 0/imm32"</span>
|
|
<span class="Constant">"0f 84/jump-if-= __mu-abort-null-index-base-address/disp32"</span>
|
|
<span class="Constant">"(__check-mu-array-bounds *"</span> rega <span class="Constant">" %"</span> regi <span class="Constant">" "</span> size-of(T) <span class="Constant">")"</span>
|
|
<span class="Constant">"8d/copy-address *("</span> rega <span class="Constant">"+"</span> regi <span class="Constant">"<<"</span> log2(size-of(T)) <span class="Constant">"+4) "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg: (addr T) <span class="Special"><-</span> index arr: (array T len), idx/regi: int
|
|
=> <span class="Constant">"(__check-mu-array-bounds *(ebp+"</span> arr.stack-offset <span class="Constant">") %"</span> regi <span class="Constant">" "</span> size-of(T) <span class="Constant">")"</span>
|
|
<span class="Constant">"8d/copy-address *(ebp+"</span> regi <span class="Constant">"<<"</span> log2(size-of(T)) <span class="Constant">"+"</span> (arr.stack-offset + <span class="Constant">4</span>) <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg: (addr T) <span class="Special"><-</span> index arr/rega: (addr array T), n
|
|
=> <span class="Constant">"81 7/subop/compare %"</span> rega <span class="Constant">" 0/imm32"</span>
|
|
<span class="Constant">"0f 84/jump-if-= __mu-abort-null-index-base-address/disp32"</span>
|
|
<span class="Constant">"(__check-mu-array-bounds *"</span> rega <span class="Constant">" "</span> n <span class="Constant">" "</span> size-of(T) <span class="Constant">")"</span>
|
|
<span class="Constant">"8d/copy-address *("</span> rega <span class="Constant">"+"</span> (n*size-of(T)+<span class="Constant">4</span>) <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg: (addr T) <span class="Special"><-</span> index arr: (array T len), n
|
|
=> <span class="Constant">"(__check-mu-array-bounds *(ebp+"</span> arr.stack-offset <span class="Constant">") "</span> n <span class="Constant">" "</span> size-of(T) <span class="Constant">")"</span>
|
|
<span class="Constant">"8d/copy-address *(ebp+"</span> (arr.stack-offset+<span class="Constant">4</span>+n*size-of(T)) <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
|
|
var/reg: (offset T) <span class="Special"><-</span> compute-offset arr: (addr array T), idx/regi: int <span class="muComment"># arr can be in reg or mem</span>
|
|
=> <span class="Constant">"69/multiply %"</span> regi <span class="Constant">" "</span> size-of(T) <span class="Constant">"/imm32 "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg: (offset T) <span class="Special"><-</span> compute-offset arr: (addr array T), idx: int <span class="muComment"># arr can be in reg or mem</span>
|
|
=> <span class="Constant">"69/multiply *(ebp+"</span> idx.stack-offset <span class="Constant">") "</span> size-of(T) <span class="Constant">"/imm32 "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg: (addr T) <span class="Special"><-</span> index arr/rega: (addr array T), o/rego: (offset T)
|
|
=> <span class="Constant">"81 7/subop/compare %"</span> rega <span class="Constant">" 0/imm32"</span>
|
|
<span class="Constant">"0f 84/jump-if-= __mu-abort-null-index-base-address/disp32"</span>
|
|
<span class="Constant">"(__check-mu-array-bounds %"</span> rega <span class="Constant">" %"</span> rego <span class="Constant">" 1 \"" function-name "</span>\<span class="Constant">")"</span>
|
|
<span class="Constant">"8d/copy-address *("</span> rega <span class="Constant">"+"</span> rego <span class="Constant">"+4) "</span> reg <span class="Constant">"/r32"</span>
|
|
|
|
Computing the length of an array is complex.
|
|
|
|
var/reg: int <span class="Special"><-</span> length arr/reg2: (addr array T)
|
|
| if T is byte (TODO)
|
|
=> <span class="Constant">"8b/-> *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
| if size-of(T) is <span class="Constant">4</span> or <span class="Constant">8</span> or <span class="Constant">16</span> or <span class="Constant">32</span> or <span class="Constant">64</span> or <span class="Constant">128</span>
|
|
=> <span class="Constant">"8b/-> *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
|
|
<span class="Constant">"c1/shift 5/subop/logic-right %"</span> reg <span class="Constant">" "</span> log2(size-of(T)) <span class="Constant">"/imm8"</span>
|
|
| otherwise
|
|
x86 has no instruction to divide by a literal, so
|
|
we need up to <span class="Constant">3</span> extra registers! eax/<span class="muRegEdx">edx</span> for division and say <span class="muRegEcx">ecx</span>
|
|
=> if reg is not eax
|
|
<span class="Constant">"50/push-eax"</span>
|
|
if reg is not <span class="muRegEcx">ecx</span>
|
|
<span class="Constant">"51/push-ecx"</span>
|
|
if reg is not <span class="muRegEdx">edx</span>
|
|
<span class="Constant">"52/push-edx"</span>
|
|
<span class="Constant">"8b/-> *"</span> reg2 <span class="Constant">" eax/r32"</span>
|
|
<span class="Constant">"31/xor %edx 2/r32/edx"</span> <span class="muComment"># sign-extend, but array size can't be negative</span>
|
|
<span class="Constant">"b9/copy-to-ecx "</span> size-of(T) <span class="Constant">"/imm32"</span>
|
|
<span class="Constant">"f7 7/subop/idiv-eax-edx-by %ecx"</span>
|
|
if reg is not eax
|
|
<span class="Constant">"89/<- %"</span> reg <span class="Constant">" 0/r32/eax"</span>
|
|
if reg is not <span class="muRegEdx">edx</span>
|
|
<span class="Constant">"5a/pop-to-edx"</span>
|
|
if reg is not <span class="muRegEcx">ecx</span>
|
|
<span class="Constant">"59/pop-to-ecx"</span>
|
|
if reg is not eax
|
|
<span class="Constant">"58/pop-to-eax"</span>
|
|
|
|
<span class="muComment"># User-defined types</span>
|
|
|
|
If a record (product) type T was defined to have elements a, b, c, ... of
|
|
types T_a, T_b, T_c, ..., then accessing one of those elements f of type T_f:
|
|
|
|
var/reg: (addr T_f) <span class="Special"><-</span> get var2/reg2: (addr T), f
|
|
=> <span class="Constant">"81 7/subop/compare %"</span> reg2 <span class="Constant">" 0/imm32"</span>
|
|
<span class="Constant">"0f 84/jump-if-= __mu-abort-null-get-base-address/disp32"</span>
|
|
<span class="Constant">"8d/copy-address *("</span> reg2 <span class="Constant">"+"</span> offset(f) <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
var/reg: (addr T_f) <span class="Special"><-</span> get var2: T, f
|
|
=> <span class="Constant">"8d/copy-address *(ebp+"</span> var2.stack-offset <span class="Constant">"+"</span> offset(f) <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
|
|
|
|
When the base is an address we perform a null check.
|
|
|
|
<span class="muComment"># Allocating memory</span>
|
|
|
|
allocate in: (addr handle T)
|
|
=> <span class="Constant">"(allocate Heap "</span> size-of(T) <span class="Constant">" "</span> in <span class="Constant">")"</span>
|
|
|
|
populate in: (addr handle array T), num <span class="muComment"># can be literal or variable on stack or register</span>
|
|
=> <span class="Constant">"(allocate-array2 Heap "</span> size-of(T) <span class="Constant">" "</span> num <span class="Constant">" "</span> in <span class="Constant">")"</span>
|
|
|
|
populate-stream in: (addr handle stream T), num <span class="muComment"># can be literal or variable on stack or register</span>
|
|
=> <span class="Constant">"(new-stream Heap "</span> size-of(T) <span class="Constant">" "</span> num <span class="Constant">" "</span> in <span class="Constant">")"</span>
|
|
|
|
<span class="muComment"># Some miscellaneous helpers to avoid error-prone size computations</span>
|
|
|
|
clear x: (addr T)
|
|
=> <span class="Constant">"(zero-out "</span> s <span class="Constant">" "</span> size-of(T) <span class="Constant">")"</span>
|
|
|
|
read-from-stream s: (addr stream T), out: (addr T)
|
|
=> <span class="Constant">"(read-from-stream "</span> s <span class="Constant">" "</span> out <span class="Constant">" "</span> size-of(T) <span class="Constant">")"</span>
|
|
|
|
write-to-stream s: (addr stream T), in: (addr T)
|
|
=> <span class="Constant">"(write-to-stream "</span> s <span class="Constant">" "</span> in <span class="Constant">" "</span> size-of(T) <span class="Constant">")"</span>
|
|
|
|
vim:ft=mu:nowrap:textwidth=<span class="Constant">0</span>
|
|
</pre>
|
|
</body>
|
|
</html>
|
|
<!-- vim: set foldmethod=manual : -->
|