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[SelectionDAG] Simplify extract_subvector( insert_subvector ( Vec, In, Idx ), Idx ) -> In

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If we are extracting a subvector that has just been inserted then we should just use the original inserted subvector.

This has come up in certain several x86 shuffle lowering cases where we are crossing 128-bit lanes.

Differential Revision: https://reviews.llvm.org/D24254

llvm-svn: 280715
This commit is contained in:
Simon Pilgrim 2016-09-06 16:42:05 +00:00
parent 700b4d043d
commit e2c59dd3f4
2 changed files with 10 additions and 9 deletions
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6
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -3750,6 +3750,12 @@ SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,
// Trivial extraction.
if (VT.getSimpleVT() == N1.getSimpleValueType())
return N1;
// EXTRACT_SUBVECTOR of INSERT_SUBVECTOR is often created
// during shuffle legalization.
if (N1.getOpcode() == ISD::INSERT_SUBVECTOR && N2 == N1.getOperand(2) &&
VT == N1.getOperand(1).getValueType())
return N1.getOperand(1);
}
break;
}

13
test/CodeGen/X86/vector-shuffle-256-v16.ll
View File

@ -3500,8 +3500,7 @@ define <16 x i16> @insert_dup_mem_v16i16_i32(i32* %ptr) {
; AVX1-LABEL: insert_dup_mem_v16i16_i32:
; AVX1: # BB#0:
; AVX1-NEXT: vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
; AVX1-NEXT: vpshuflw {{.*#+}} xmm0 = xmm0[0,0,0,0,4,5,6,7]
; AVX1-NEXT: vpshufd {{.*#+}} xmm0 = xmm0[0,0,1,1]
; AVX1-NEXT: vpshufb {{.*#+}} xmm0 = xmm0[0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1]
; AVX1-NEXT: vinsertf128 $1, %xmm0, %ymm0, %ymm0
; AVX1-NEXT: retq
;
@ -3521,8 +3520,7 @@ define <16 x i16> @insert_dup_mem_v16i16_sext_i16(i16* %ptr) {
; AVX1: # BB#0:
; AVX1-NEXT: movswl (%rdi), %eax
; AVX1-NEXT: vmovd %eax, %xmm0
; AVX1-NEXT: vpshuflw {{.*#+}} xmm0 = xmm0[0,0,0,0,4,5,6,7]
; AVX1-NEXT: vpshufd {{.*#+}} xmm0 = xmm0[0,0,1,1]
; AVX1-NEXT: vpshufb {{.*#+}} xmm0 = xmm0[0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1]
; AVX1-NEXT: vinsertf128 $1, %xmm0, %ymm0, %ymm0
; AVX1-NEXT: retq
;
@ -3544,8 +3542,7 @@ define <16 x i16> @insert_dup_elt1_mem_v16i16_i32(i32* %ptr) #0 {
; AVX1-LABEL: insert_dup_elt1_mem_v16i16_i32:
; AVX1: # BB#0:
; AVX1-NEXT: vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
; AVX1-NEXT: vpshuflw {{.*#+}} xmm0 = xmm0[1,1,1,1,4,5,6,7]
; AVX1-NEXT: vpshufd {{.*#+}} xmm0 = xmm0[0,0,1,1]
; AVX1-NEXT: vpshufb {{.*#+}} xmm0 = xmm0[2,3,2,3,2,3,2,3,2,3,2,3,2,3,2,3]
; AVX1-NEXT: vinsertf128 $1, %xmm0, %ymm0, %ymm0
; AVX1-NEXT: retq
;
@ -3564,9 +3561,7 @@ define <16 x i16> @insert_dup_elt3_mem_v16i16_i32(i32* %ptr) #0 {
; AVX1-LABEL: insert_dup_elt3_mem_v16i16_i32:
; AVX1: # BB#0:
; AVX1-NEXT: vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
; AVX1-NEXT: vpshufd {{.*#+}} xmm0 = xmm0[1,0,1,1]
; AVX1-NEXT: vpshuflw {{.*#+}} xmm0 = xmm0[3,3,3,3,4,5,6,7]
; AVX1-NEXT: vpshufd {{.*#+}} xmm0 = xmm0[0,0,1,1]
; AVX1-NEXT: vpshufb {{.*#+}} xmm0 = xmm0[2,3,2,3,2,3,2,3,2,3,2,3,2,3,2,3]
; AVX1-NEXT: vinsertf128 $1, %xmm0, %ymm0, %ymm0
; AVX1-NEXT: retq
;