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Fix undefined behavior (negation of INT_MIN) in ARM backend.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162520 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Smith 2012-08-24 00:35:46 +00:00
parent 9e085a8637
commit aaf217953b
2 changed files with 2 additions and 2 deletions
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2
lib/Target/ARM/ARMInstrInfo.td
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@ -275,7 +275,7 @@ def imm16_31 : ImmLeaf<i32, [{
def so_imm_neg_asmoperand : AsmOperandClass { let Name = "ARMSOImmNeg"; }
def so_imm_neg : Operand<i32>, PatLeaf<(imm), [{
int64_t Value = -(int)N->getZExtValue();
unsigned Value = -(unsigned)N->getZExtValue();
return Value && ARM_AM::getSOImmVal(Value) != -1;
}], imm_neg_XFORM> {
let ParserMatchClass = so_imm_neg_asmoperand;

2
lib/Target/ARM/MCTargetDesc/ARMMCCodeEmitter.cpp
View File

@ -783,7 +783,7 @@ getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx,
// Immediate is always encoded as positive. The 'U' bit controls add vs sub.
if (Imm8 < 0)
Imm8 = -Imm8;
Imm8 = -(uint32_t)Imm8;
// Scaled by 4.
Imm8 /= 4;