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[SelectionDAG] Add support for vector demandedelts in BSWAP opcodes 

llvm-svn: 286582
This commit is contained in:
Simon Pilgrim 2016-11-11 11:51:29 +00:00
parent 9db74e7f1c
commit 807f9cf243
2 changed files with 4 additions and 7 deletions
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3
llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -2575,7 +2575,8 @@ void SelectionDAG::computeKnownBits(SDValue Op, APInt &KnownZero,
break;
}
case ISD::BSWAP: {
computeKnownBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1);
computeKnownBits(Op.getOperand(0), KnownZero2, KnownOne2, DemandedElts,
Depth + 1);
KnownZero = KnownZero2.byteSwap();
KnownOne = KnownOne2.byteSwap();
break;

8
llvm/test/CodeGen/X86/known-bits-vector.ll
View File

@ -309,16 +309,12 @@ define <4 x i32> @knownbits_mask_srem_shuffle_lshr(<4 x i32> %a0) nounwind {
define <4 x i32> @knownbits_mask_bswap_shuffle_shl(<4 x i32> %a0) nounwind {
; X32-LABEL: knownbits_mask_bswap_shuffle_shl:
; X32: # BB#0:
; X32-NEXT: vpand {{\.LCPI.*}}, %xmm0, %xmm0
; X32-NEXT: vpshufb {{.*#+}} xmm0 = xmm0[3,2,1,0,3,2,1,0,15,14,13,12,15,14,13,12]
; X32-NEXT: vpslld $22, %xmm0, %xmm0
; X32-NEXT: vxorps %xmm0, %xmm0, %xmm0
; X32-NEXT: retl
;
; X64-LABEL: knownbits_mask_bswap_shuffle_shl:
; X64: # BB#0:
; X64-NEXT: vpand {{.*}}(%rip), %xmm0, %xmm0
; X64-NEXT: vpshufb {{.*#+}} xmm0 = xmm0[3,2,1,0,3,2,1,0,15,14,13,12,15,14,13,12]
; X64-NEXT: vpslld $22, %xmm0, %xmm0
; X64-NEXT: vxorps %xmm0, %xmm0, %xmm0
; X64-NEXT: retq
%1 = and <4 x i32> %a0, <i32 32767, i32 -1, i32 -1, i32 32767>
%2 = call <4 x i32> @llvm.bswap.v4i32(<4 x i32> %1)