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Make promotion in operation legalization for SETCC work correctly.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76153 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2009-07-17 05:16:04 +00:00
parent 0b79a7727d
commit a64eb92fe3
2 changed files with 11 additions and 23 deletions
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28
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
View File

@ -2973,7 +2973,8 @@ void SelectionDAGLegalize::PromoteNode(SDNode *Node,
SmallVectorImpl<SDValue> &Results) {
MVT OVT = Node->getValueType(0);
if (Node->getOpcode() == ISD::UINT_TO_FP ||
Node->getOpcode() == ISD::SINT_TO_FP) {
Node->getOpcode() == ISD::SINT_TO_FP ||
Node->getOpcode() == ISD::SETCC) {
OVT = Node->getOperand(0).getValueType();
}
MVT NVT = TLI.getTypeToPromoteTo(Node->getOpcode(), OVT);
@ -3085,30 +3086,11 @@ void SelectionDAGLegalize::PromoteNode(SDNode *Node,
break;
}
case ISD::SETCC: {
// First step, figure out the appropriate operation to use.
// Allow SETCC to not be supported for all legal data types
// Mostly this targets FP
MVT NewInTy = Node->getOperand(0).getValueType();
MVT OldVT = NewInTy; OldVT = OldVT;
// Scan for the appropriate larger type to use.
while (1) {
NewInTy = (MVT::SimpleValueType)(NewInTy.getSimpleVT()+1);
assert(NewInTy.isInteger() == OldVT.isInteger() &&
"Fell off of the edge of the integer world");
assert(NewInTy.isFloatingPoint() == OldVT.isFloatingPoint() &&
"Fell off of the edge of the floating point world");
// If the target supports SETCC of this type, use it.
if (TLI.isOperationLegalOrCustom(ISD::SETCC, NewInTy))
break;
}
if (NewInTy.isInteger())
if (NVT.isInteger())
llvm_unreachable("Cannot promote Legal Integer SETCC yet");
else {
Tmp1 = DAG.getNode(ISD::FP_EXTEND, dl, NewInTy, Tmp1);
Tmp2 = DAG.getNode(ISD::FP_EXTEND, dl, NewInTy, Tmp2);
Tmp1 = DAG.getNode(ISD::FP_EXTEND, dl, NVT, Node->getOperand(0));
Tmp2 = DAG.getNode(ISD::FP_EXTEND, dl, NVT, Node->getOperand(1));
}
Results.push_back(DAG.getNode(ISD::SETCC, dl, Node->getValueType(0),
Tmp1, Tmp2, Node->getOperand(2)));

6
test/CodeGen/Alpha/2009-07-16-PromoteFloatCompare.ll Normal file
View File

@ -0,0 +1,6 @@
; RUN: llvm-as < %s | llc -march=alpha
define i1 @a(float %x) {
%r = fcmp ult float %x, 1.0
ret i1 %r
}