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[SelectionDAG] combine vextract (v1iX extract_subvector(vNiX, Idx))

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into vextract(vNiX,Idx) when creating vextract with getNode().
This case appeared in AVX512 after fixing pr33349 in r310552.

Differential revision: https://reviews.llvm.org/D36571

llvm-svn: 310828
This commit is contained in:
Elad Cohen 2017-08-14 10:49:45 +00:00
parent e2fe4189b2
commit 81062b38f1
2 changed files with 9 additions and 8 deletions
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9
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -4373,6 +4373,15 @@ SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,
return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT, N1.getOperand(0), N2);
}
}
// EXTRACT_VECTOR_ELT of v1iX EXTRACT_SUBVECTOR could be formed
// when vector types are scalarized and v1iX is legal.
// vextract (v1iX extract_subvector(vNiX, Idx)) -> vextract(vNiX,Idx)
if (N1.getOpcode() == ISD::EXTRACT_SUBVECTOR &&
N1.getValueType().getVectorNumElements() == 1) {
return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT, N1.getOperand(0),
N1.getOperand(1));
}
break;
case ISD::EXTRACT_ELEMENT:
assert(N2C && (unsigned)N2C->getZExtValue() < 2 && "Bad EXTRACT_ELEMENT!");

8
test/CodeGen/X86/pr33349.ll
View File

@ -43,8 +43,6 @@ target triple = "x86_64-unknown-linux-gnu"
; SKX-NEXT: kshiftrw $2, %k0, %k1
; SKX-NEXT: kshiftlw $15, %k1, %k2
; SKX-NEXT: kshiftrw $15, %k2, %k2
; SKX-NEXT: kshiftlw $15, %k2, %k2
; SKX-NEXT: kshiftrw $15, %k2, %k2
; SKX-NEXT: kmovd %k2, %eax
; SKX-NEXT: testb $1, %al
; SKX-NEXT: fld1
@ -53,24 +51,18 @@ target triple = "x86_64-unknown-linux-gnu"
; SKX-NEXT: fcmovne %st(2), %st(0)
; SKX-NEXT: kshiftlw $14, %k1, %k1
; SKX-NEXT: kshiftrw $15, %k1, %k1
; SKX-NEXT: kshiftlw $15, %k1, %k1
; SKX-NEXT: kshiftrw $15, %k1, %k1
; SKX-NEXT: kmovd %k1, %eax
; SKX-NEXT: testb $1, %al
; SKX-NEXT: fld %st(1)
; SKX-NEXT: fcmovne %st(3), %st(0)
; SKX-NEXT: kshiftlw $15, %k0, %k1
; SKX-NEXT: kshiftrw $15, %k1, %k1
; SKX-NEXT: kshiftlw $15, %k1, %k1
; SKX-NEXT: kshiftrw $15, %k1, %k1
; SKX-NEXT: kmovd %k1, %eax
; SKX-NEXT: testb $1, %al
; SKX-NEXT: fld %st(2)
; SKX-NEXT: fcmovne %st(4), %st(0)
; SKX-NEXT: kshiftlw $14, %k0, %k0
; SKX-NEXT: kshiftrw $15, %k0, %k0
; SKX-NEXT: kshiftlw $15, %k0, %k0
; SKX-NEXT: kshiftrw $15, %k0, %k0
; SKX-NEXT: kmovd %k0, %eax
; SKX-NEXT: testb $1, %al
; SKX-NEXT: fxch %st(3)