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[X86][AVX] Fold broadcast(bitcast(src)) -> bitcast(broadcast(src))

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llvm-svn: 352751
This commit is contained in:
Simon Pilgrim 2019-01-31 14:04:07 +00:00
parent e2881b3306
commit c8d3ba7d8f
4 changed files with 16 additions and 12 deletions
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8
lib/Target/X86/X86ISelLowering.cpp
View File

@ -31938,6 +31938,14 @@ static SDValue combineTargetShuffle(SDValue N, SelectionDAG &DAG,
return DAG.getNode(X86ISD::VBROADCAST, DL, VT,
DAG.getBitcast(SrcVT, Res));
}
// broadcast(bitcast(src)) -> bitcast(broadcast(src))
// 32-bit targets have to bitcast i64 to f64, so better to bitcast upward.
if (Src.getOpcode() == ISD::BITCAST &&
SrcVT.getScalarSizeInBits() == BCVT.getScalarSizeInBits()) {
EVT NewVT = EVT::getVectorVT(*DAG.getContext(), BCVT.getScalarType(),
VT.getVectorNumElements());
return DAG.getBitcast(VT, DAG.getNode(X86ISD::VBROADCAST, DL, NewVT, BC));
}
return SDValue();
}
case X86ISD::PSHUFD:

8
test/CodeGen/X86/avx-vbroadcast.ll
View File

@ -45,9 +45,9 @@ define <4 x i64> @A2(i64* %ptr, i64* %ptr2) nounwind uwtable readnone ssp {
; X64-LABEL: A2:
; X64: ## %bb.0: ## %entry
; X64-NEXT: movq (%rdi), %rax
; X64-NEXT: vmovq %rax, %xmm0
; X64-NEXT: movq %rax, (%rsi)
; X64-NEXT: vmovddup {{.*#+}} xmm0 = xmm0[0,0]
; X64-NEXT: vmovq %rax, %xmm0
; X64-NEXT: vpshufd {{.*#+}} xmm0 = xmm0[0,1,0,1]
; X64-NEXT: vinsertf128 $1, %xmm0, %ymm0, %ymm0
; X64-NEXT: retq
entry:
@ -110,8 +110,8 @@ define <8 x i32> @B3(i32* %ptr, i32* %ptr2) nounwind uwtable readnone ssp {
; X32-NEXT: movl {{[0-9]+}}(%esp), %eax
; X32-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X32-NEXT: movl (%ecx), %ecx
; X32-NEXT: vmovd %ecx, %xmm0
; X32-NEXT: movl %ecx, (%eax)
; X32-NEXT: vmovd %ecx, %xmm0
; X32-NEXT: vpshufd {{.*#+}} xmm0 = xmm0[0,0,0,0]
; X32-NEXT: vinsertf128 $1, %xmm0, %ymm0, %ymm0
; X32-NEXT: retl
@ -119,8 +119,8 @@ define <8 x i32> @B3(i32* %ptr, i32* %ptr2) nounwind uwtable readnone ssp {
; X64-LABEL: B3:
; X64: ## %bb.0: ## %entry
; X64-NEXT: movl (%rdi), %eax
; X64-NEXT: vmovd %eax, %xmm0
; X64-NEXT: movl %eax, (%rsi)
; X64-NEXT: vmovd %eax, %xmm0
; X64-NEXT: vpshufd {{.*#+}} xmm0 = xmm0[0,0,0,0]
; X64-NEXT: vinsertf128 $1, %xmm0, %ymm0, %ymm0
; X64-NEXT: retq

3
test/CodeGen/X86/avx2-vbroadcast.ll
View File

@ -244,8 +244,7 @@ define <16 x i16> @broadcast_mem_v4i16_v16i16(<4 x i16>* %ptr) {
; X32-LABEL: broadcast_mem_v4i16_v16i16:
; X32: ## %bb.0:
; X32-NEXT: movl {{[0-9]+}}(%esp), %eax
; X32-NEXT: vmovsd {{.*#+}} xmm0 = mem[0],zero
; X32-NEXT: vbroadcastsd %xmm0, %ymm0
; X32-NEXT: vbroadcastsd (%eax), %ymm0
; X32-NEXT: retl
;
; X64-LABEL: broadcast_mem_v4i16_v16i16:

9
test/CodeGen/X86/subvector-broadcast.ll
View File

@ -1592,15 +1592,13 @@ define <8 x i32> @test_2xi32_to_8xi32_mem(<2 x i32>* %vp) {
; X32-AVX2-LABEL: test_2xi32_to_8xi32_mem:
; X32-AVX2: # %bb.0:
; X32-AVX2-NEXT: movl {{[0-9]+}}(%esp), %eax
; X32-AVX2-NEXT: vmovsd {{.*#+}} xmm0 = mem[0],zero
; X32-AVX2-NEXT: vbroadcastsd %xmm0, %ymm0
; X32-AVX2-NEXT: vbroadcastsd (%eax), %ymm0
; X32-AVX2-NEXT: retl
;
; X32-AVX512-LABEL: test_2xi32_to_8xi32_mem:
; X32-AVX512: # %bb.0:
; X32-AVX512-NEXT: movl {{[0-9]+}}(%esp), %eax
; X32-AVX512-NEXT: vmovsd {{.*#+}} xmm0 = mem[0],zero
; X32-AVX512-NEXT: vbroadcastsd %xmm0, %ymm0
; X32-AVX512-NEXT: vbroadcastsd (%eax), %ymm0
; X32-AVX512-NEXT: retl
;
; X64-AVX1-LABEL: test_2xi32_to_8xi32_mem:
@ -1635,8 +1633,7 @@ define <16 x i32> @test_2xi32_to_16xi32_mem(<2 x i32>* %vp) {
; X32-AVX2-LABEL: test_2xi32_to_16xi32_mem:
; X32-AVX2: # %bb.0:
; X32-AVX2-NEXT: movl {{[0-9]+}}(%esp), %eax
; X32-AVX2-NEXT: vmovsd {{.*#+}} xmm0 = mem[0],zero
; X32-AVX2-NEXT: vbroadcastsd %xmm0, %ymm0
; X32-AVX2-NEXT: vbroadcastsd (%eax), %ymm0
; X32-AVX2-NEXT: vmovaps %ymm0, %ymm1
; X32-AVX2-NEXT: retl
;