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| author | Kartik Agaram <vc@akkartik.com> | 2018-09-24 23:49:43 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-09-24 23:49:43 -0700 |
| commit | bc3e572acd4bfb3556c2361c7c6559380eacda0a (patch) | |
| tree | b0afe16fd5eef0a3a1d38a5e5fb0199d0921e797 /subx/apps/factorial.subx | |
| parent | 5347cf8bf4839218171f5f46b07e00d26fa76292 (diff) | |
| download | mu-bc3e572acd4bfb3556c2361c7c6559380eacda0a.tar.gz | |
4518
Diffstat (limited to 'subx/apps/factorial.subx')
| -rw-r--r-- | subx/apps/factorial.subx | 49 |
1 files changed, 41 insertions, 8 deletions
diff --git a/subx/apps/factorial.subx b/subx/apps/factorial.subx index b6d904ba..b4f8867e 100644 --- a/subx/apps/factorial.subx +++ b/subx/apps/factorial.subx @@ -106,9 +106,15 @@ test_factorial: # print msg to stderr if a != b, otherwise print "." check_ints_equal: # (a : int, b : int, msg : (address array byte)) -> boolean + # prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # save registers + 51/push-ECX + 53/push-EBX # load args into EAX, EBX and ECX - 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 0/r32/EAX 0x4/disp8 . # copy *(ESP+4) to EAX - 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 3/r32/EBX 0x8/disp8 . # copy *(ESP+8) to EBX + 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 0/r32/EAX 0x8/disp8 . # copy *(EBP+8) to EAX + 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 3/r32/EBX 0xc/disp8 . # copy *(EBP+12) to EBX # if EAX == b/EBX 39/compare 3/mod/direct 0/rm32/EAX . . . 3/r32/EBX . . # compare EAX and EBX 75/jump-if-unequal $check_ints_equal:else/disp8 @@ -120,11 +126,11 @@ check_ints_equal: # (a : int, b : int, msg : (address array byte)) -> boolean # discard arg 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add 4 to ESP # return - c3/return + eb/jump $check_ints_equal:end/disp8 # else: $check_ints_equal:else: # copy msg into ECX - 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 1/r32/ECX 0xc/disp8 . # copy *(ESP+12) to ECX + 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 1/r32/ECX 0x10/disp8 . # copy *(EBP+16) to ECX # print(ECX) # push args 51/push-ECX @@ -139,12 +145,28 @@ $check_ints_equal:else: e8/call write_stderr/disp32 # discard arg 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add 4 to ESP +$check_ints_equal:end: + # restore registers + 5b/pop-to-EBX + 59/pop-to-ECX # end + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP c3/return # compare a null-terminated ascii string with a more idiomatic length-prefixed byte array # reason for the name: the only place we should have null-terminated ascii strings is from commandline args argv_equal: # s : null-terminated ascii string, benchmark : length-prefixed ascii string -> EAX : boolean + # prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # save registers + 51/push-ECX + 52/push-EDX + 53/push-EBX + 56/push-ESI + 57/push-EDI + # pseudocode: # initialize n = b.length # initialize s1 = s @@ -160,12 +182,12 @@ argv_equal: # s : null-terminated ascii string, benchmark : length-prefixed asc # return *s1 == 0 # {{{ # initialize s into EDI - 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 7/r32/EDI 4/disp8 . # copy *(ESP+4) to EDI + 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 7/r32/EDI 8/disp8 . # copy *(EBP+8) to EDI # initialize benchmark length n into EDX - 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 2/r32/EDX 8/disp8 . # copy *(ESP+8) to EDX + 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 2/r32/EDX 0xc/disp8 . # copy *(EBP+12) to EDX 8b/copy 0/mod/indirect 2/rm32/EDX . . . 2/r32/EDX . . # copy *EDX to EDX # initialize benchmark data into ESI - 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 6/r32/ESI 8/disp8 . # copy *(ESP+8) to ESI + 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 4 to ESI # initialize loop counter i into ECX b9/copy . . . . . . . 0/imm32/exit # copy 1 to ECX @@ -197,10 +219,21 @@ $argv_break: 81 7/subop/compare 3/mod/direct 0/rm32/EAX . . . . . 0/imm32 # compare EAX with 0 75/jump-if-not-equal $argv_fail/disp8 b8/copy . . . . . . . 1/imm32 # copy 1 to EAX - c3/return + eb/jump $argv_end/disp8 # return false $argv_fail: b8/copy . . . . . . . 0/imm32 # copy 0 to EAX + +$argv_end: + # restore registers + 5f/pop-to-EDI + 5e/pop-to-ESI + 5b/pop-to-EBX + 5a/pop-to-EDX + 59/pop-to-ECX + # end + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP c3/return # }}} # tests for argv_equal {{{ |