https://bugs.llvm.org/show_bug.cgi?id=44694
Bug ID: 44694
Summary: [X86][AVX] Failure to combine to HADDPD
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/U2jZo3
#include <x86intrin.h>
__m256d add_pd(__m256d a, __m256d b) {
return __builtin_shufflevector(a, b, -1, 2, 4, 6) +
__builtin_shufflevector(a, b, -1, 3, 5, 7);
}
define <4 x double> @_Z6add_pdDv4_dS_(<4 x double> %0, <4 x double> %1) {
%3 = shufflevector <4 x double> %0, <4 x double> %1, <4 x i32> <i32 undef,
i32 2, i32 4, i32 6>
%4 = shufflevector <4 x double> %0, <4 x double> %1, <4 x i32> <i32 undef,
i32 3, i32 5, i32 7>
%5 = fadd <4 x double> %3, %4
ret <4 x double> %5
}
_Z6add_pdDv4_dS_: # @_Z6add_pdDv4_dS_
vperm2f128 $49, %ymm1, %ymm0, %ymm0 # ymm0 = ymm0[2,3],ymm1[2,3]
vinsertf128 $1, %xmm1, %ymm0, %ymm1
vunpcklpd %ymm0, %ymm1, %ymm2 # ymm2 = ymm1[0],ymm0[0],ymm1[2],ymm0[2]
vshufpd $14, %ymm0, %ymm1, %ymm0 # ymm0 = ymm1[0],ymm0[1],ymm1[3],ymm0[3]
vaddpd %ymm0, %ymm2, %ymm0
retq
Which should be combine to:
vperm2f128 $49, %ymm1, %ymm0, %ymm2 # ymm2 = ymm0[2,3],ymm1[2,3]
vinsertf128 $1, %xmm1, %ymm0, %ymm0
vhaddpd %ymm2, %ymm0, %ymm0
retq
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