================
@@ -3437,6 +3437,30 @@ void SIInstrInfo::removeModOperands(MachineInstr &MI)
const {
}
}
+std::optional<int64_t> SIInstrInfo::extractSubregFromImm(int64_t Imm,
+ unsigned SubRegIndex)
{
+ switch (SubRegIndex) {
+ case AMDGPU::NoSubRegister:
+ return Imm;
+ case AMDGPU::sub0:
+ return Lo_32(Imm);
+ case AMDGPU::sub1:
+ return Hi_32(Imm);
+ case AMDGPU::lo16:
+ return SignExtend64<16>(Imm);
+ case AMDGPU::hi16:
+ return SignExtend64<16>(Imm >> 16);
+ case AMDGPU::sub1_lo16:
+ return SignExtend64<16>(Imm >> 32);
+ case AMDGPU::sub1_hi16:
+ return SignExtend64<16>(Imm >> 48);
+ default:
+ return std::nullopt;
+ }
+
+ llvm_unreachable("covered subregister switch");
----------------
arsenm wrote:
Yes, this should be the version that makes msvc, gcc, and clang happy
https://github.com/llvm/llvm-project/pull/127484
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