diff options
Diffstat (limited to 'subx/054string_equal.subx')
| -rw-r--r-- | subx/054string_equal.subx | 234 |
1 files changed, 117 insertions, 117 deletions
diff --git a/subx/054string_equal.subx b/subx/054string_equal.subx index a397dd8e..2b0d6006 100644 --- a/subx/054string_equal.subx +++ b/subx/054string_equal.subx @@ -1,169 +1,169 @@ # Comparing 'regular' length-prefixed strings. == code -# instruction effective address operand displacement immediate -# op subop mod rm32 base index scale r32 -# 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes +# instruction effective address operand displacement immediate +# op subop mod rm32 base index scale r32 +# 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes # main: - 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-to-EAX 1/imm32 - cd/syscall 0x80/imm8 + 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-to-EAX 1/imm32 + cd/syscall 0x80/imm8 string-equal: # s : string, benchmark : 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 - # pseudocode: - # if s.length != b.length return false - # for i = 0; i < s.length; ++i - # if s[i] != b[i] return false - # return true - # registers: - # i: ECX - # s.length: EDX - # b.length: EBX - # b[i]: EBX - # s[i]: EAX - # - # var s/EAX : (address array byte) - 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 0/r32/EAX 8/disp8 . # copy *(EBP+8) to EAX - # var benchmark/EBX : (address array byte) - 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 s.length != b.length return false + # 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 + # pseudocode: + # if s.length != b.length return false + # for i = 0; i < s.length; ++i + # if s[i] != b[i] return false + # return true + # registers: + # i: ECX + # s.length: EDX + # b.length: EBX + # b[i]: EBX + # s[i]: EAX + # + # var s/EAX : (address array byte) + 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 0/r32/EAX 8/disp8 . # copy *(EBP+8) to EAX + # var benchmark/EBX : (address array byte) + 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 s.length != b.length return false # EDX = s.length - 8b/copy 0/mod/indirect 0/rm32/EAX . . . 2/r32/EDX . . # copy *EAX to EDX + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 2/r32/EDX . . # copy *EAX to EDX # compare s.length and b.length - 39/compare 0/mod/indirect 3/rm32/EBX . . . 2/r32/EDX . . # compare *EBX with EDX - 75/jump-if-not-equal $string-equal:false/disp8 + 39/compare 0/mod/indirect 3/rm32/EBX . . . 2/r32/EDX . . # compare *EBX with EDX + 75/jump-if-not-equal $string-equal:false/disp8 $string-equal:lengths: - # var i/ECX : int = 0 - b9/copy-to-ECX 0/imm32 - # EBX = &b[i] - 43/inc-EBX - # EAX = &s[i] - 40/inc-EAX + # var i/ECX : int = 0 + b9/copy-to-ECX 0/imm32 + # EBX = &b[i] + 43/inc-EBX + # EAX = &s[i] + 40/inc-EAX $string-equal:loop: - # if i >= s.length return true - 39/compare 3/mod/direct 1/rm32/ECX . . . 2/r32/EDX . . # compare ECX with EDX - 7d/jump-if-greater-or-equal $string-equal:true/disp8 - # if b[i] != s[i] return false + # if i >= s.length return true + 39/compare 3/mod/direct 1/rm32/ECX . . . 2/r32/EDX . . # compare ECX with EDX + 7d/jump-if-greater-or-equal $string-equal:true/disp8 + # if b[i] != s[i] return false # ESI = s[i] - 8b/copy 0/mod/indirect 0/rm32/EAX . . . 6/r32/ESI . . # copy *EAX to ESI + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 6/r32/ESI . . # copy *EAX to ESI # compare b[i] with ESI - 39/compare 0/mod/indirect 3/rm32/EBX . . . 6/r32/ESI . . # compare *EBX with ESI - 75/jump-if-not-equal $string-equal:false/disp8 - # ++i - 41/inc-ECX - 40/inc-EAX - 43/inc-EBX - # loop - eb/jump $string-equal:loop/disp8 + 39/compare 0/mod/indirect 3/rm32/EBX . . . 6/r32/ESI . . # compare *EBX with ESI + 75/jump-if-not-equal $string-equal:false/disp8 + # ++i + 41/inc-ECX + 40/inc-EAX + 43/inc-EBX + # loop + eb/jump $string-equal:loop/disp8 $string-equal:true: - # return true - b8/copy-to-EAX 1/imm32 - eb/jump $string-equal:end/disp8 + # return true + b8/copy-to-EAX 1/imm32 + eb/jump $string-equal:end/disp8 $string-equal:false: - # return false - b8/copy-to-EAX 0/imm32 + # return false + b8/copy-to-EAX 0/imm32 $string-equal:end: - # restore registers - 5e/pop-to-ESI - 5b/pop-to-EBX - 5a/pop-to-EDX - 59/pop-to-ECX - # epilog - 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP - 5d/pop-to-EBP - c3/return + # restore registers + 5e/pop-to-ESI + 5b/pop-to-EBX + 5a/pop-to-EDX + 59/pop-to-ECX + # epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return ## tests test-compare-empty-with-empty-string: - # EAX = string-equal("", "") + # EAX = string-equal("", "") # push args - 68/push ""/imm32 - 68/push ""/imm32 + 68/push ""/imm32 + 68/push ""/imm32 # call - e8/call string-equal/disp32 + e8/call string-equal/disp32 # discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # call check-ints-equal(EAX, 1, msg) + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # call check-ints-equal(EAX, 1, msg) # push args - 68/push "F - test-compare-empty-with-empty-string"/imm32 - 68/push 1/imm32/true - 50/push-EAX + 68/push "F - test-compare-empty-with-empty-string"/imm32 + 68/push 1/imm32/true + 50/push-EAX # call - e8/call check-ints-equal/disp32 + e8/call check-ints-equal/disp32 # discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP - c3/return + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + c3/return test-compare-empty-with-non-empty-string: # also checks length-mismatch code path - # EAX = string-equal("", "Abc") + # EAX = string-equal("", "Abc") # push args - 68/push "Abc"/imm32 - 68/push ""/imm32 + 68/push "Abc"/imm32 + 68/push ""/imm32 # call - e8/call string-equal/disp32 + e8/call string-equal/disp32 # discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # call check-ints-equal(EAX, 0, msg) + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # call check-ints-equal(EAX, 0, msg) # push args - 68/push "F - test-compare-empty-with-non-empty-string"/imm32 - 68/push 0/imm32/false - 50/push-EAX + 68/push "F - test-compare-empty-with-non-empty-string"/imm32 + 68/push 0/imm32/false + 50/push-EAX # call - e8/call check-ints-equal/disp32 + e8/call check-ints-equal/disp32 # discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP - c3/return + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + c3/return test-compare-equal-strings: - # EAX = string-equal("Abc", "Abc") + # EAX = string-equal("Abc", "Abc") # push args - 68/push "Abc"/imm32 - 68/push "Abc"/imm32 + 68/push "Abc"/imm32 + 68/push "Abc"/imm32 # call - e8/call string-equal/disp32 + e8/call string-equal/disp32 # discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # call check-ints-equal(EAX, 1, msg) + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # call check-ints-equal(EAX, 1, msg) # push args - 68/push "F - test-compare-equal-strings"/imm32 - 68/push 1/imm32/true - 50/push-EAX + 68/push "F - test-compare-equal-strings"/imm32 + 68/push 1/imm32/true + 50/push-EAX # call - e8/call check-ints-equal/disp32 + e8/call check-ints-equal/disp32 # discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP - c3/return + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + c3/return test-compare-inequal-strings-equal-lengths: - # EAX = string-equal("Abc", "Adc") + # EAX = string-equal("Abc", "Adc") # push args - 68/push "Adc"/imm32 - 68/push "Abc"/imm32 + 68/push "Adc"/imm32 + 68/push "Abc"/imm32 # call - e8/call string-equal/disp32 + e8/call string-equal/disp32 # discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # call check-ints-equal(EAX, 0, msg) + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # call check-ints-equal(EAX, 0, msg) # push args - 68/push "F - test-compare-inequal-strings-equal-lengths"/imm32 - 68/push 0/imm32/false - 50/push-EAX + 68/push "F - test-compare-inequal-strings-equal-lengths"/imm32 + 68/push 0/imm32/false + 50/push-EAX # call - e8/call check-ints-equal/disp32 + e8/call check-ints-equal/disp32 # discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP - c3/return + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + c3/return # vim:nowrap:textwidth=0 |