diff options
Diffstat (limited to 'CSAPP/tmul.s')
| -rw-r--r-- | CSAPP/tmul.s | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/CSAPP/tmul.s b/CSAPP/tmul.s new file mode 100644 index 0000000..52cee75 --- /dev/null +++ b/CSAPP/tmul.s @@ -0,0 +1,43 @@ + .file "tmul.c" + .text + .globl tmul_ok_asm + .type tmul_ok_asm, @function +tmul_ok_asm: +.LFB0: + .cfi_startproc + imulq %rdi, %rsi + movq %rsi, (%rdx) +# Code deleted +# testq %rsi, %rsi +# setg %al +# Code inserted + setae %al +# End of code inserted + movzbl %al, %eax + ret + .cfi_endproc +.LFE0: + .size tmul_ok_asm, .-tmul_ok_asm + .globl umul_ok_asm + .type umul_ok_asm, @function +umul_ok_asm: +.LFB1: + .cfi_startproc + movq %rdx, %rcx #Save copy of dest + movq %rsi, %rax #copy y to %rax + mulq %rdi #unsigned multiplication + movq %rax, (%rcx) #copy result (low 64-bit) to dest + setae %al #Set low-order byt according to mulq +# Code removed +# imulq %rdi, %rsi +# movq %rsi, (%rdx) +# testq %rsi, %rsi +# setne %al +# End of code removed + movzbl %al, %eax + ret + .cfi_endproc +.LFE1: + .size umul_ok_asm, .-umul_ok_asm + .ident "GCC: (GNU) 5.3.1 20160406 (Red Hat 5.3.1-6)" + .section .note.GNU-stack,"",@progbits |