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| author | Kartik Agaram <vc@akkartik.com> | 2019-05-22 22:26:02 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2019-05-22 22:33:42 -0700 |
| commit | d1fa22f7b45378ddb6ce4eaf04f36f6c0bf0203c (patch) | |
| tree | 3ef25991f53b7990a6bf954efdabe89f2d8850bc /subx | |
| parent | 40077d0d2b39ca5bed1f316e186b8f23b7148dc8 (diff) | |
| download | mu-d1fa22f7b45378ddb6ce4eaf04f36f6c0bf0203c.tar.gz | |
5221
Explore using a second register for pointer dereferencing.
Diffstat (limited to 'subx')
| -rw-r--r-- | subx/apps/handle.subx | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/subx/apps/handle.subx b/subx/apps/handle.subx index 60b4021a..97a6c622 100644 --- a/subx/apps/handle.subx +++ b/subx/apps/handle.subx @@ -231,6 +231,17 @@ lookup: # h : (handle T) -> EAX : (address T) # add 4 05/add-to-EAX 4/imm32 # - } + # - alternative consuming a second register { +#? # ECX = handle->alloc_id +#? 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX +#? # EAX = handle->address (payload) +#? 8b/copy 1/mod/*+disp8 0/rm32/EAX . . . 0/r32/EAX 4/disp8 . # copy *(EAX+4) to EAX +#? # if (ECX != *EAX) abort +#? 39/compare 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # compare *EAX and ECX +#? 75/jump-if-not-equal $lookup:abort/disp8 +#? # add 4 to EAX +#? 05/add-to-EAX 4/imm32 + # - } # . epilog 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP 5d/pop-to-EBP |