https://bugs.llvm.org/show_bug.cgi?id=39477
Bug ID: 39477
Summary: Failure to simplify floor(float(int x)) -> float(int
x)
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: fil...@gmail.com, llvm-bugs@lists.llvm.org,
spatel+l...@rotateright.com, til...@gmail.com
#include <math.h>
float floor_s32(int a)
{
return floorf(a);
}
double floor_s64(long long a)
{
return floor(a);
}
-O3 -march=btver2
https://godbolt.org/z/3xAI3L
clang:
_Z9floor_s32i: # @_Z9floor_s32i
vcvtsi2ssl %edi, %xmm0, %xmm0
vroundss $9, %xmm0, %xmm0, %xmm0
retq
_Z9floor_s64x: # @_Z9floor_s64x
vcvtsi2sdq %rdi, %xmm0, %xmm0
vroundsd $9, %xmm0, %xmm0, %xmm0
retq
gcc:
_Z9floor_s32i:
vcvtsi2ss %edi, %xmm0, %xmm0
ret
_Z9floor_s64x:
vcvtsi2sdq %rdi, %xmm0, %xmm0
ret
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