Create a subregclass from SGPR for the call clobbered register pairs. #160
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Use this register class in the return instruction for the operand that holds the return address.
cdevadas
commented
Jun 20, 2019
| @@ -683,6 +683,12 @@ void SIFrameLowering::emitEpilogue(MachineFunction &MF, | |||
| LivePhysRegs LiveRegs(*ST.getRegisterInfo()); | |||
| LiveRegs.addLiveIns(MBB); | |||
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| // to avoid clobbering the registers used in the return instruction. | |||
| if (MBBI->getOpcode() == AMDGPU::S_SETPC_B64_return && | |||
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I assume it is safe to check for the opcode first, and then get the registers.
Not sure whether I should check the operand is register.
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Use this new register class in the return instruction for the operand that holds the return address.