https://bugs.llvm.org/show_bug.cgi?id=34394
Bug ID: 34394
Summary: [X86] broadcast i32x2 from memory not lowered to the
memory form of vbroadcasti32x2
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: ayman.m...@intel.com
CC: llvm-bugs@lists.llvm.org
Broadcasting <2 x i32> from memory gets lowered to bad sequence instead of
simply using the vbroadcasti32x2 instruction.
define <4 x i32> @test_2xi32_to_4xi32_mem(<2 x i32>* %vp) {
%vec = load <2 x i32>, <2 x i32>* %vp
%res = shufflevector <2 x i32> %vec, <2 x i32> undef, <4 x i32> <i32 0, i32
1, i32 0, i32 1>
ret <4 x i32> %res
}
LLVM emits:
vpmovzxdq (%rdi), %xmm0 # xmm0 = mem[0],zero,mem[1],zero
vpshufd $136, %xmm0, %xmm0 # xmm0 = xmm0[0,2,0,2]
retq
Instead of:
vbroadcasti32x2 (%rdi), %xmm0
retq
==============================================================================
define <8 x i32> @test_2xi32_to_8xi32_mem(<2 x i32>* %vp) {
%vec = load <2 x i32>, <2 x i32>* %vp
%res = shufflevector <2 x i32> %vec, <2 x i32> undef, <8 x i32> <i32 0, i32
1, i32 0, i32 1, i32 0, i32 1, i32 0, i32 1>
ret <8 x i32> %res
}
LLVM emits:
vpmovzxdq (%rdi), %xmm0 # xmm0 = mem[0],zero,mem[1],zero
vpshufd $232, %xmm0, %xmm0 # xmm0 = xmm0[0,2,2,3]
vpbroadcastq %xmm0, %ymm0
retq
Instead of:
vbroadcasti32x2 (%rdi), %ymm0
retq
==============================================================================
define <16 x i32> @test_2xi32_to_16xi32_mem(<2 x i32>* %vp) {
%vec = load <2 x i32>, <2 x i32>* %vp
%res = shufflevector <2 x i32> %vec, <2 x i32> undef, <16 x i32> <i32 0, i32
1, i32 0, i32 1, i32 0, i32 1, i32 0, i32 1, i32 0, i32 1, i32 0, i32 1, i32 0,
i32 1, i32 0, i32 1>
ret <16 x i32> %res
}
LLVM emits the following:
vpmovzxdq (%rdi), %xmm0 # xmm0 = mem[0],zero,mem[1],zero
vmovdqa32 .LCPI45_0(%rip), %zmm1 # zmm1 = [0,2,0,2,0,2,0,2,0,2,0,2,0,2,0,2]
vpermd %zmm0, %zmm1, %zmm0
retq
Instead of:
vbroadcasti32x2 (%rdi), %zmm0
retq
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