akkartik
/
mu
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

6946 - print floats somewhat intuitively in hex

This commit is contained in:
Kartik Agaram 2020-10-04 11:12:23 -07:00
parent 0371140abe
commit b8d613e7c2
18 changed files with 314 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

132
117write-int-hex.subx
View File

@ -176,24 +176,9 @@ test-write-byte-hex-buffered:
c3/return
write-int32-hex: # f: (addr stream byte), n: int
# pseudocode:
# write(f, "0x")
# ecx = 28
# while true
# if (ecx < 0) break
# eax = n >> ecx
# eax = eax & 0xf
# append-byte(f, AL)
# ecx -= 4
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# . save registers
50/push-eax
51/push-ecx
# ecx = 28
b9/copy-to-ecx 0x1c/imm32
$write-int32-hex:hex-prefix:
# write(f, "0x")
# . . push args
@ -203,11 +188,48 @@ $write-int32-hex:hex-prefix:
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
$write-int32-hex:loop:
# if (ecx < 0) break
$write-int32-hex:rest:
# write-int32-hex-bits(f, n, 32)
# . . push args
68/push 0x20/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call write-int32-hex-bits/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
$write-int32-hex:end:
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
# print rightmost 'bits' of 'n'
# bits must be multiple of 4
write-int32-hex-bits: # f: (addr stream byte), n: int, bits: int
# pseudocode:
# bits -= 4
# while true
# if (bits < 0) break
# eax = n >> bits
# eax = eax & 0xf
# append-byte(f, AL)
# bits -= 4
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# . save registers
50/push-eax
51/push-ecx
# ecx = bits-4
8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 1/r32/ecx 0x10/disp8 . # copy *(ebp+16) to ecx
81 5/subop/subtract 3/mod/direct 1/rm32/ecx . . . . . 4/imm32 # subtract from ecx
$write-int32-hex-bits:loop:
# if (bits < 0) break
81 7/subop/compare 3/mod/direct 1/rm32/ecx . . . . . 0/imm32 # compare ecx
7c/jump-if-< $write-int32-hex:end/disp8
# eax = n >> ecx
7c/jump-if-< $write-int32-hex-bits:end/disp8
# eax = n >> bits
8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0xc/disp8 . # copy *(ebp+12) to eax
d3/>>ecx 5/subop/pad-zeroes 3/mod/direct 0/rm32/eax . . . . . . # shift eax right by ecx bits, padding zeroes
# eax = to-hex-char(AL)
@ -221,10 +243,10 @@ $write-int32-hex:loop:
e8/call append-byte/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# ecx -= 4
# bits -= 4
81 5/subop/subtract 3/mod/direct 1/rm32/ecx . . . . . 4/imm32 # subtract from ecx
eb/jump $write-int32-hex:loop/disp8
$write-int32-hex:end:
eb/jump $write-int32-hex-bits:loop/disp8
$write-int32-hex-bits:end:
# . restore registers
59/pop-to-ecx
58/pop-to-eax
@ -264,24 +286,9 @@ test-write-int32-hex:
c3/return
write-int32-hex-buffered: # f: (addr buffered-file), n: int
# pseudocode:
# write-buffered(f, "0x")
# ecx = 28
# while true
# if (ecx < 0) break
# eax = n >> ecx
# eax = eax & 0xf
# write-byte-buffered(f, AL)
# ecx -= 4
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# . save registers
50/push-eax
51/push-ecx
# ecx = 28
b9/copy-to-ecx 0x1c/imm32
$write-int32-hex-buffered:hex-prefix:
# write-buffered(f, "0x")
# . . push args
@ -291,11 +298,48 @@ $write-int32-hex-buffered:hex-prefix:
e8/call write-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
$write-int32-hex-buffered:loop:
# if (ecx < 0) break
$write-int32-hex-buffered:rest:
# write-int32-hex-bits-buffered(f, n, 32)
# . . push args
68/push 0x20/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call write-int32-hex-bits-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
$write-int32-hex-buffered:end:
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
# print rightmost 'bits' of 'n'
# bits must be multiple of 4
write-int32-hex-bits-buffered: # f: (addr buffered-file), n: int, bits: int
# pseudocode:
# bits -= 4
# while true
# if (bits < 0) break
# eax = n >> bits
# eax = eax & 0xf
# write-byte-buffered(f, AL)
# bits -= 4
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# . save registers
50/push-eax
51/push-ecx
# ecx = bits-4
8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 1/r32/ecx 0x10/disp8 . # copy *(ebp+16) to ecx
81 5/subop/subtract 3/mod/direct 1/rm32/ecx . . . . . 4/imm32 # subtract from ecx
$write-int32-hex-bits-buffered:loop:
# if (bits < 0) break
81 7/subop/compare 3/mod/direct 1/rm32/ecx . . . . . 0/imm32 # compare ecx
7c/jump-if-< $write-int32-hex-buffered:end/disp8
# eax = n >> ecx
7c/jump-if-< $write-int32-hex-bits-buffered:end/disp8
# eax = n >> bits
8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0xc/disp8 . # copy *(ebp+12) to eax
d3/>>ecx 5/subop/pad-zeroes 3/mod/direct 0/rm32/eax . . . . . . # shift eax right by ecx bits, padding zeroes
# eax = to-hex-char(AL)
@ -309,10 +353,10 @@ $write-int32-hex-buffered:loop:
e8/call write-byte-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# ecx -= 4
# bits -= 4
81 5/subop/subtract 3/mod/direct 1/rm32/ecx . . . . . 4/imm32 # subtract from ecx
eb/jump $write-int32-hex-buffered:loop/disp8
$write-int32-hex-buffered:end:
eb/jump $write-int32-hex-bits-buffered:loop/disp8
$write-int32-hex-bits-buffered:end:
# . restore registers
59/pop-to-ecx
58/pop-to-eax

13
304screen.subx
View File

@ -236,6 +236,19 @@ $print-int32-hex-to-real-screen:end:
5d/pop-to-ebp
c3/return
print-int32-hex-bits-to-real-screen: # n: int, bits: int
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
#
(write-int32-hex-bits-buffered Stdout *(ebp+8) *(ebp+0xc) *(ebp+0x10))
(flush Stdout)
$print-int32-hex-bits-to-real-screen:end:
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
print-int32-decimal-to-real-screen: # n: int
# . prologue
55/push-ebp

3
400.mu
View File

@ -62,7 +62,9 @@ sig write-buffered f: (addr buffered-file), msg: (addr array byte)
sig append-byte-hex f: (addr stream byte), n: int
sig write-byte-hex-buffered f: (addr buffered-file), n: int
sig write-int32-hex f: (addr stream byte), n: int
sig write-int32-hex-bits f: (addr stream byte), n: int, bits: int
sig write-int32-hex-buffered f: (addr buffered-file), n: int
sig write-int32-hex-bits-buffered f: (addr buffered-file), n: int, bits: int
sig is-hex-int? in: (addr slice) -> result/eax: boolean
sig parse-hex-int in: (addr array byte) -> result/eax: int
sig parse-hex-int-from-slice in: (addr slice) -> result/eax: int
@ -152,6 +154,7 @@ sig print-slice-to-real-screen s: (addr slice)
sig print-stream-to-real-screen s: (addr stream byte)
sig print-grapheme-to-real-screen c: grapheme
sig print-int32-hex-to-real-screen n: int
sig print-int32-hex-bits-to-real-screen n: int, bits: int
sig print-int32-decimal-to-real-screen n: int
sig write-int32-decimal-buffered f: (addr buffered-file), n: int
sig reset-formatting-on-real-screen

39
405screen.mu
View File

@ -435,6 +435,45 @@ $print-int32-hex:body: {
{
break-if-=
# fake screen
var s2: (stream byte 0x100)
var s2-addr/esi: (addr stream byte) <- address s2
write-int32-hex s2-addr, n
var screen-addr/edi: (addr screen) <- copy screen
{
var done?/eax: boolean <- stream-empty? s2-addr
compare done?, 0
break-if-!=
var g/eax: grapheme <- read-grapheme s2-addr
print-grapheme screen, g
loop
}
}
}
}
fn print-int32-hex-bits screen: (addr screen), n: int, bits: int {
$print-int32-hex-bits:body: {
compare screen, 0
{
break-if-!=
print-int32-hex-bits-to-real-screen n, bits
break $print-int32-hex-bits:body
}
{
break-if-=
# fake screen
var s2: (stream byte 0x100)
var s2-addr/esi: (addr stream byte) <- address s2
write-int32-hex-bits s2-addr, n, bits
var screen-addr/edi: (addr screen) <- copy screen
{
var done?/eax: boolean <- stream-empty? s2-addr
compare done?, 0
break-if-!=
var g/eax: grapheme <- read-grapheme s2-addr
print-grapheme screen, g
loop
}
}
}
}

171
408print-float.mu Normal file
View File

@ -0,0 +1,171 @@
# quick-n-dirty way to print out floats in hex
# examples:
# 0.5 = 0x3f000000 = 0011| 1111 | 0000 | 0000 | 0000 | 0000 | 0000 | 0000
# = 0 | 01111110 | 00000000000000000000000
# + exponent mantissa
# = 0 | 00000000000000000000000 | 01111110
# mantissa exponent
# = 0 | 000000000000000000000000 | 01111110
# zero-pad mantissa exponent
# = +1.000000 e -01
fn test-print-float-normal {
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 0x20 # 32 columns should be more than enough
# print 0.5
var one/eax: int <- copy 1
var half/xmm0: float <- convert one
var two/eax: int <- copy 2
var two-f/xmm1: float <- convert two
half <- divide two-f
print-float screen, half
#
check-screen-row screen, 1, "1.000000e-01 ", "F - test-print-float-normal"
}
fn test-print-float-zero {
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 0x20 # 32 columns should be more than enough
# print 0
var zero: float
print-float screen, zero
#
check-screen-row screen, 1, "0 ", "F - test-print-float-zero"
}
fn test-print-float-negative-zero {
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 0x20 # 32 columns should be more than enough
# print 0
var n: int
copy-to n, 0x80000000
var negative-zero/xmm0: float <- reinterpret n
print-float screen, negative-zero
#
check-screen-row screen, 1, "-0 ", "F - test-print-float-negative-zero"
}
fn test-print-float-infinity {
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 0x20 # 32 columns should be more than enough
# print
var n: int
# 0|11111111|00000000000000000000000
# 0111|1111|1000|0000|0000|0000|0000|0000
copy-to n, 0x7f800000
var infinity/xmm0: float <- reinterpret n
print-float screen, infinity
#
check-screen-row screen, 1, "Inf ", "F - test-print-float-infinity"
}
fn test-print-float-negative-infinity {
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 0x20 # 32 columns should be more than enough
# print
var n: int
copy-to n, 0xff800000
var negative-infinity/xmm0: float <- reinterpret n
print-float screen, negative-infinity
#
check-screen-row screen, 1, "-Inf ", "F - test-print-float-negative-infinity"
}
fn test-print-float-not-a-number {
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 0x20 # 32 columns should be more than enough
# print
var n: int
copy-to n, 0xffffffff # exponent must be all 1's, and mantissa must be non-zero
var negative-infinity/xmm0: float <- reinterpret n
print-float screen, negative-infinity
#
check-screen-row screen, 1, "Nan ", "F - test-print-float-not-a-number"
}
fn print-float screen: (addr screen), n: float {
$print-float:body: {
# - special names
var bits/eax: int <- reinterpret n
compare bits, 0
{
break-if-!=
print-string screen, "0"
break $print-float:body
}
compare bits, 0x80000000
{
break-if-!=
print-string screen, "-0"
break $print-float:body
}
compare bits, 0x7f800000
{
break-if-!=
print-string screen, "Inf"
break $print-float:body
}
compare bits, 0xff800000
{
break-if-!=
print-string screen, "-Inf"
break $print-float:body
}
var exponent/ecx: int <- copy bits
exponent <- shift-right 0x17 # 23 bits of mantissa
exponent <- and 0xff
compare exponent, 0xff
{
break-if-!=
print-string screen, "Nan"
break $print-float:body
}
# - regular numbers
var sign/edx: int <- copy bits
sign <- shift-right 0x1f
{
compare sign, 1
break-if-!=
print-string screen, "-"
}
$print-float:leading-digit: {
# check for subnormal numbers
compare exponent, 0
{
break-if-!=
print-string screen, "0."
exponent <- increment
break $print-float:leading-digit
}
# normal numbers
print-string screen, "1."
}
var mantissa/ebx: int <- copy bits
mantissa <- and 0x7fffff
print-int32-hex-bits screen, mantissa, 0x18
# print exponent
print-string screen, "e"
exponent <- subtract 0x7f
compare exponent, 0
{
break-if->=
print-string screen, "-"
}
var exp-magnitude/eax: int <- abs exponent
print-int32-hex-bits screen, exp-magnitude, 8
}
}
#? fn main -> r/ebx: int {
#? run-tests
#? #? test-print-float-negative-zero
#? #? print-int32-hex 0, 0
#? #? test-print-float-normal
#? r <- copy 0
#? }

BIN
apps/assort
View File

Binary file not shown.

BIN
apps/braces
View File

Binary file not shown.

BIN
apps/calls
View File

Binary file not shown.

BIN
apps/crenshaw2-1
View File

Binary file not shown.

BIN
apps/crenshaw2-1b
View File

Binary file not shown.

BIN
apps/dquotes
View File

Binary file not shown.

BIN
apps/factorial
View File

Binary file not shown.

BIN
apps/hex
View File

Binary file not shown.

BIN
apps/mu
View File

Binary file not shown.

BIN
apps/pack
View File

Binary file not shown.

BIN
apps/sigils
View File

Binary file not shown.

BIN
apps/survey
View File

Binary file not shown.

BIN
apps/tests
View File

Binary file not shown.