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[AMDGPU] Simplify getNumFlatOffsetBits. NFC. 

Remove some checks that have already been done in the only caller.
This commit is contained in:
Jay Foad 2020-10-01 15:06:27 +01:00
parent 56d8a37216
commit e20f459229
3 changed files with 3 additions and 10 deletions
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2
llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
View File

@ -1712,7 +1712,7 @@ bool AMDGPUDAGToDAGISel::SelectFlatOffset(SDNode *N,
SDLoc DL(N);
uint64_t RemainderOffset = COffsetVal;
uint64_t ImmField = 0;
const unsigned NumBits = TII->getNumFlatOffsetBits(AS, IsSigned);
const unsigned NumBits = TII->getNumFlatOffsetBits(IsSigned);
if (IsSigned) {
// Use signed division by a power of two to truncate towards 0.
int64_t D = 1LL << (NumBits - 1);

9
llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
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@ -6893,14 +6893,7 @@ bool SIInstrInfo::isBufferSMRD(const MachineInstr &MI) const {
return RI.getRegClass(RCID)->hasSubClassEq(&AMDGPU::SGPR_128RegClass);
}
unsigned SIInstrInfo::getNumFlatOffsetBits(unsigned AddrSpace,
bool Signed) const {
if (!ST.hasFlatInstOffsets())
return 0;
if (ST.hasFlatSegmentOffsetBug() && AddrSpace == AMDGPUAS::FLAT_ADDRESS)
return 0;
unsigned SIInstrInfo::getNumFlatOffsetBits(bool Signed) const {
if (ST.getGeneration() >= AMDGPUSubtarget::GFX10)
return Signed ? 12 : 11;

2
llvm/lib/Target/AMDGPU/SIInstrInfo.h
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@ -1016,7 +1016,7 @@ public:
return isUInt<12>(Imm);
}
unsigned getNumFlatOffsetBits(unsigned AddrSpace, bool Signed) const;
unsigned getNumFlatOffsetBits(bool Signed) const;
/// Returns if \p Offset is legal for the subtarget as the offset to a FLAT
/// encoded instruction. If \p Signed, this is for an instruction that