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Kartik Agaram 2020-10-31 20:38:11 -07:00
parent 84a7745224
commit c3964ff60a
1 changed files with 16 additions and 0 deletions
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@ -215,6 +215,22 @@ Comparisons must always start with a register:
compare var1/xreg1, var2/xreg2 => "0f 2f/compare %" xreg2 " " xreg1 "/x32"
compare var1/xreg1, var2 => "0f 2f/compare *(ebp+" var2.stack-offset ") " xreg1 "/x32"
## Blocks
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 => "81 0/subop/add %esp " size-of(var) "/imm32"
Clean up var/reg => "8f 0/subop/pop %" reg
Clean up var/xreg => "f3 0f 10/-> *esp " xreg "/x32"
"81 0/subop/add %esp 4/imm32"
## Jumps
Besides having to clean up any variable declarations (see above) between
themselves and their target, jumps translate like this:
break => "e9/jump break/disp32"
break label => "e9/jump " label ":break/disp32"
loop => "e9/jump loop/disp32"