https://bugs.llvm.org/show_bug.cgi?id=41892
Bug ID: 41892
Summary: [X86][SSE] Failure to merge 2 x float stores to <2 x
float> store
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
https://godbolt.org/z/InfZZK
#include <x86intrin.h>
void sum_pairs_128(__m128 f, float *p) {
p[0] = f[0] + f[1];
p[1] = f[2] + f[3];
}
clang -O3 -march=btver2
_Z13sum_pairs_128Dv4_fPf: # @_Z13sum_pairs_128Dv4_fPf
vhaddps %xmm0, %xmm0, %xmm0
vmovss %xmm0, (%rdi)
vextractps $1, %xmm0, 4(%rdi)
retq
would be better if we managed to merge to:
_Z13sum_pairs_128Dv4_fPf: # @_Z13sum_pairs_128Dv4_fPf
vhaddps %xmm0, %xmm0, %xmm0
vmovsd %xmm0, (%rdi)
retq
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