#include <algorithm>
int f(int x, int y) {
return x > y ? x : y;
}
int g(int x, int y) {
return std::max(x, y);
}sh-3.2$ clang++ -O2 -S foo.cc-O2 gen code係無分別。
.section __TEXT,__text,regular,pure_instructions
.build_version macos, 10, 14
.globl __Z1fii ## -- Begin function _Z1fii
.p2align 4, 0x90
__Z1fii: ## @_Z1fii
.cfi_startproc
## %bb.0:
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset %rbp, -16
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
cmpl %esi, %edi
cmovgel %edi, %esi
movl %esi, %eax
popq %rbp
retq
.cfi_endproc
## -- End function
.globl __Z1gii ## -- Begin function _Z1gii
.p2align 4, 0x90
__Z1gii: ## @_Z1gii
.cfi_startproc
## %bb.0:
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset %rbp, -16
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
cmpl %esi, %edi
cmovll %esi, %edi
movl %edi, %eax
popq %rbp
retq
.cfi_endproc
## -- End function
.subsections_via_symbols
驚食死
