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AMDGPU: Sign extend constants when splitting them

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This will confuse later passes which try to look at the
immediate value and don't truncate first.

llvm-svn: 280974
This commit is contained in:
Matt Arsenault 2016-09-08 17:44:36 +00:00
parent b779c31861
commit c2bf766536
1 changed files with 2 additions and 3 deletions
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5
lib/Target/AMDGPU/SIInstrInfo.cpp
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@ -1990,11 +1990,10 @@ MachineOperand SIInstrInfo::buildExtractSubRegOrImm(
unsigned SubIdx,
const TargetRegisterClass *SubRC) const {
if (Op.isImm()) {
// XXX - Is there a better way to do this?
if (SubIdx == AMDGPU::sub0)
return MachineOperand::CreateImm(Op.getImm() & 0xFFFFFFFF);
return MachineOperand::CreateImm(static_cast<int32_t>(Op.getImm()));
if (SubIdx == AMDGPU::sub1)
return MachineOperand::CreateImm(Op.getImm() >> 32);
return MachineOperand::CreateImm(static_cast<int32_t>(Op.getImm() >> 32));
llvm_unreachable("Unhandled register index for immediate");
}