https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105034
Bug ID: 105034 Summary: [10/11/12 regression]Suboptimal codegen for min/max with -Os Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: crazylht at gmail dot com Target Milestone: --- #define max(a,b) (((a) > (b))? (a) : (b)) #define min(a,b) (((a) < (b))? (a) : (b)) int foo(int x) { return max(x,0); } int bar(int x) { return min(x,0); } unsigned int baz(unsigned int x) { return min(x,1); } gcc10/11/12 -Os -msse4.1 foo(int): movd xmm0, edi xorps xmm1, xmm1 pmaxsd xmm0, xmm1 movd eax, xmm0 ret bar(int): movd xmm0, edi xorps xmm1, xmm1 pminsd xmm0, xmm1 movd eax, xmm0 ret baz(unsigned int): xor eax, eax test edi, edi setne al ret gcc9.4 -Os -msse4.1 foo(int): test edi, edi mov eax, 0 cmovns eax, edi ret bar(int): test edi, edi mov eax, 0 cmovle eax, edi ret baz(unsigned int): xor eax, eax test edi, edi setne al ret Os size text data bss dec hex filename 178 0 0 178 b2 Os.o O2 size text data bss dec hex filename 176 0 0 176 b0 O2.o https://godbolt.org/z/1sYxdTcKz