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Take account of boolean vector contents when promoting a build vector from i1 to some other type. rdar://problem/12210060

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llvm-svn: 162960
This commit is contained in:
Pete Cooper 2012-08-30 23:58:52 +00:00
parent 115dc993c3
commit a83a3953f1
2 changed files with 33 additions and 1 deletions
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18
lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
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@ -2913,8 +2913,24 @@ SDValue DAGTypeLegalizer::PromoteIntRes_BUILD_VECTOR(SDNode *N) {
SmallVector<SDValue, 8> Ops;
Ops.reserve(NumElems);
unsigned ExtendOp = ISD::ANY_EXTEND;
// Extending boolean constants needs to consider the
// value boolean vector constants take on this target and extend
// with sign or zeros appropriately.
if (OutVT.getVectorElementType() == MVT::i1) {
switch (TLI.getBooleanContents(true)) {
case TargetLowering::UndefinedBooleanContent:
break;
case TargetLowering::ZeroOrOneBooleanContent:
ExtendOp = ISD::ZERO_EXTEND;
break;
case TargetLowering::ZeroOrNegativeOneBooleanContent:
ExtendOp = ISD::SIGN_EXTEND;
break;
}
}
for (unsigned i = 0; i != NumElems; ++i) {
SDValue Op = DAG.getNode(ISD::ANY_EXTEND, dl, NOutVTElem, N->getOperand(i));
SDValue Op = DAG.getNode(ExtendOp, dl, NOutVTElem, N->getOperand(i));
Ops.push_back(Op);
}

16
test/CodeGen/X86/vec_select.ll Normal file
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@ -0,0 +1,16 @@
; RUN: llc < %s -march=x86 | FileCheck %s
; When legalizing the v4i1 constant, we need to consider the boolean contents
; For x86 a boolean vector constant is all ones so the constants in memory
; will be ~0U not 1.
; CHECK: .long 4294967295
; CHECK: .long 4294967295
; CHECK: .long 0
; CHECK: .long 0
; CHECK: test
define <4 x i8> @test(<4 x i8> %a, <4 x i8> %b) {
%sel = select <4 x i1> <i1 true, i1 true, i1 false, i1 false>, <4 x i8> %a, <4 x i8> %b
ret <4 x i8> %sel
}