Changes in directory llvm/lib/Transforms/Scalar:
InstructionCombining.cpp updated: 1.550 -> 1.551
---
Log message:
Undo the last patch until 253.perlbmk passes with these changes.
---
Diffs of the changes: (+46 -3)
InstructionCombining.cpp | 49 ++++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 46 insertions(+), 3 deletions(-)
Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.550
llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.551
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.550 Tue Nov 28
01:23:01 2006
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp Tue Nov 28 14:23:51 2006
@@ -5739,6 +5739,13 @@
unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
+ // FIXME. We currently implement cast-to-bool as a setne %X, 0. This is
+ // because codegen cannot accurately perform a truncate to bool operation.
+ // Something goes wrong in promotion to a larger type. When CodeGen can
+ // handle a proper truncation to bool, this should be removed.
+ if (DestTy == Type::BoolTy)
+ return BinaryOperator::createSetNE(Src, Constant::getNullValue(SrcTy));
+
// See if we can simplify any instructions used by the LHS whose sole
// purpose is to compute bits we don't care about.
uint64_t KnownZero = 0, KnownOne = 0;
@@ -6014,11 +6021,35 @@
}
Instruction *InstCombiner::visitFPToUI(CastInst &CI) {
- return commonCastTransforms(CI);
+ if (Instruction *I = commonCastTransforms(CI))
+ return I;
+
+ // FIXME. We currently implement cast-to-bool as a setne %X, 0. This is
+ // because codegen cannot accurately perform a truncate to bool operation.
+ // Something goes wrong in promotion to a larger type. When CodeGen can
+ // handle a proper truncation to bool, this should be removed.
+ Value *Src = CI.getOperand(0);
+ const Type *SrcTy = Src->getType();
+ const Type *DestTy = CI.getType();
+ if (DestTy == Type::BoolTy)
+ return BinaryOperator::createSetNE(Src, Constant::getNullValue(SrcTy));
+ return 0;
}
Instruction *InstCombiner::visitFPToSI(CastInst &CI) {
- return commonCastTransforms(CI);
+ if (Instruction *I = commonCastTransforms(CI))
+ return I;
+
+ // FIXME. We currently implement cast-to-bool as a setne %X, 0. This is
+ // because codegen cannot accurately perform a truncate to bool operation.
+ // Something goes wrong in promotion to a larger type. When CodeGen can
+ // handle a proper truncation to bool, this should be removed.
+ Value *Src = CI.getOperand(0);
+ const Type *SrcTy = Src->getType();
+ const Type *DestTy = CI.getType();
+ if (DestTy == Type::BoolTy)
+ return BinaryOperator::createSetNE(Src, Constant::getNullValue(SrcTy));
+ return 0;
}
Instruction *InstCombiner::visitUIToFP(CastInst &CI) {
@@ -6030,7 +6061,19 @@
}
Instruction *InstCombiner::visitPtrToInt(CastInst &CI) {
- return commonCastTransforms(CI);
+ if (Instruction *I = commonCastTransforms(CI))
+ return I;
+
+ // FIXME. We currently implement cast-to-bool as a setne %X, 0. This is
+ // because codegen cannot accurately perform a truncate to bool operation.
+ // Something goes wrong in promotion to a larger type. When CodeGen can
+ // handle a proper truncation to bool, this should be removed.
+ Value *Src = CI.getOperand(0);
+ const Type *SrcTy = Src->getType();
+ const Type *DestTy = CI.getType();
+ if (DestTy == Type::BoolTy)
+ return BinaryOperator::createSetNE(Src, Constant::getNullValue(SrcTy));
+ return 0;
}
Instruction *InstCombiner::visitIntToPtr(CastInst &CI) {
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