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R600/SI: Mark EXEC_LO and EXEC_HI as reserved

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These registers can be allocated and used like other 32-bit registers,
but it seems like a likely source for bugs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218350 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard 2014-09-24 01:33:23 +00:00
parent b8112412cf
commit 90d1726693
1 changed files with 6 additions and 0 deletions
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6
lib/Target/R600/SIRegisterInfo.cpp
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@ -32,6 +32,12 @@ SIRegisterInfo::SIRegisterInfo(const AMDGPUSubtarget &st)
BitVector SIRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
Reserved.set(AMDGPU::EXEC);
// EXEC_LO and EXEC_HI could be allocated and used as regular register,
// but this seems likely to result in bugs, so I'm marking them as reserved.
Reserved.set(AMDGPU::EXEC_LO);
Reserved.set(AMDGPU::EXEC_HI);
Reserved.set(AMDGPU::INDIRECT_BASE_ADDR);
Reserved.set(AMDGPU::FLAT_SCR);