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[AMDGPU] Ask subtarget if waitcnt instruction is needed before barrier instruction 

Differential Revision: https://reviews.llvm.org/D24985

llvm-svn: 282875
This commit is contained in:
Konstantin Zhuravlyov 2016-09-30 16:50:36 +00:00
parent 51f514d853
commit d7bdf24f32
2 changed files with 9 additions and 2 deletions
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6
llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
View File

@ -540,6 +540,12 @@ public:
/// Return the maximum number of waves per SIMD for kernels using \p VGPRs VGPRs
unsigned getOccupancyWithNumVGPRs(unsigned VGPRs) const;
/// \returns True if waitcnt instruction is needed before barrier instruction,
/// false otherwise.
bool needWaitcntBeforeBarrier() const {
return true;
}
};
} // End namespace llvm

5
llvm/lib/Target/AMDGPU/SIInsertWaits.cpp
View File

@ -590,8 +590,9 @@ bool SIInsertWaits::runOnMachineFunction(MachineFunction &MF) {
// S_SENDMSG implicitly waits for all outstanding LGKM transfers to finish,
// but we also want to wait for any other outstanding transfers before
// signalling other hardware blocks
if (I->getOpcode() == AMDGPU::S_BARRIER ||
I->getOpcode() == AMDGPU::S_SENDMSG)
if ((I->getOpcode() == AMDGPU::S_BARRIER &&
ST->needWaitcntBeforeBarrier()) ||
I->getOpcode() == AMDGPU::S_SENDMSG)
Required = LastIssued;
else
Required = handleOperands(*I);