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| author | Kartik Agaram <vc@akkartik.com> | 2018-10-05 21:30:22 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-10-05 21:30:22 -0700 |
| commit | 94ad882e828f83df4a4cc0deab1a10e9d5e54eec (patch) | |
| tree | f51448732674fa8744e8517c4755255afc764b1f /subx/052kernel_string_equal.subx | |
| parent | 03d50cc83c7c2bebb2b019667b80c1c51f4a8def (diff) | |
| download | mu-94ad882e828f83df4a4cc0deab1a10e9d5e54eec.tar.gz | |
4668
Diffstat (limited to 'subx/052kernel_string_equal.subx')
| -rw-r--r-- | subx/052kernel_string_equal.subx | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/subx/052kernel_string_equal.subx b/subx/052kernel_string_equal.subx index b0b646c5..85aba0c0 100644 --- a/subx/052kernel_string_equal.subx +++ b/subx/052kernel_string_equal.subx @@ -24,7 +24,7 @@ e8/call run-tests/disp32 # 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'. # exit(Num-test-failures) 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/EBX Num-test-failures/disp32 # copy *Num-test-failures to EBX - b8/copy . . . . . . . 1/imm32 # copy to EAX + b8/copy-to-EAX 1/imm32 cd/syscall 0x80/imm8 # compare a null-terminated ascii string with a more idiomatic length-prefixed byte array @@ -63,15 +63,15 @@ kernel-string-equal: # s : null-terminated ascii string, benchmark : length-pre 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 6/r32/ESI 0xc/disp8 . # copy *(EBP+12) to ESI 81 0/subop/add 3/mod/direct 6/rm32/ESI . . . . . 4/imm32 # add to ESI # initialize loop counter i into ECX - b9/copy . . . . . . . 0/imm32/exit # copy to ECX + b9/copy-to-ECX 0/imm32/exit # while (i/ECX < n/EDX) $kernel-string-equal:loop: 39/compare 3/mod/direct 1/rm32/ECX . . . 2/r32/EDX . . # compare ECX with EDX 74/jump-if-equal $kernel-string-equal:break/disp8 # c1/EAX, c2/EBX = *s, *benchmark - b8/copy 0/imm32 # clear EAX + b8/copy-to-EAX 0/imm32 8a/copy 0/mod/indirect 7/rm32/EDI . . . 0/r32/EAX . . # copy byte at *EDI to lower byte of EAX - bb/copy 0/imm32 # clear EBX + bb/copy-to-EBX 0/imm32 8a/copy 0/mod/indirect 6/rm32/ESI . . . 3/r32/EBX . . # copy byte at *ESI to lower byte of EBX # if (c1 == 0) return false 3d/compare-EAX 0/imm32 @@ -87,16 +87,16 @@ $kernel-string-equal:loop: eb/jump $kernel-string-equal:loop/disp8 $kernel-string-equal:break: # if (*s/EDI == 0) return true - b8/copy 0/imm32 # clear EAX + b8/copy-to-EAX 0/imm32 8a/copy 0/mod/indirect 7/rm32/EDI . . . 0/r32/EAX . . # copy byte at *EDI to lower byte of EAX 3d/compare-EAX 0/imm32 75/jump-if-not-equal $kernel-string-equal:false/disp8 $kernel-string-equal:true: - b8/copy . . . . . . . 1/imm32 # copy to EAX + b8/copy-to-EAX 1/imm32 eb/jump $kernel-string-equal:end/disp8 # return false $kernel-string-equal:false: - b8/copy . . . . . . . 0/imm32 # copy to EAX + b8/copy-to-EAX 0/imm32 $kernel-string-equal:end: # restore registers |