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[fast-isel] Don't try to encode LONG_MIN using cmn instructions.

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rdar://11038907


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152847 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2012-03-15 21:40:23 +00:00
parent b84ad4aa7d
commit 530b19b702
1 changed files with 9 additions and 5 deletions
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14
lib/Target/ARM/ARMFastISel.cpp
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@ -1384,12 +1384,16 @@ bool ARMFastISel::ARMEmitCmp(const Value *Src1Value, const Value *Src2Value,
SrcVT == MVT::i1) {
const APInt &CIVal = ConstInt->getValue();
Imm = (isZExt) ? (int)CIVal.getZExtValue() : (int)CIVal.getSExtValue();
if (Imm < 0) {
isNegativeImm = true;
Imm = -Imm;
// We can't encode LONG_MIN (i.e., 0x80000000) as an immediate because
// there is no way to represent 2147483648 as a signed 32-bit int.
if (Imm != (int)0x80000000) {
if (Imm < 0) {
isNegativeImm = true;
Imm = -Imm;
}
UseImm = isThumb2 ? (ARM_AM::getT2SOImmVal(Imm) != -1) :
(ARM_AM::getSOImmVal(Imm) != -1);
}
UseImm = isThumb2 ? (ARM_AM::getT2SOImmVal(Imm) != -1) :
(ARM_AM::getSOImmVal(Imm) != -1);
}
} else if (const ConstantFP *ConstFP = dyn_cast<ConstantFP>(Src2Value)) {
if (SrcVT == MVT::f32 || SrcVT == MVT::f64)