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Reland "[AMDGPU] Fix data race on RegisterBank initialization."

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This commit is contained in:
Huihui Zhang 2020-02-07 14:05:52 -08:00
parent 7476e569b5
commit 6556c615f3
1 changed files with 7 additions and 7 deletions
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14
llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
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@ -197,15 +197,15 @@ AMDGPURegisterBankInfo::AMDGPURegisterBankInfo(const GCNSubtarget &ST)
TII(Subtarget.getInstrInfo()) {
// HACK: Until this is fully tablegen'd.
static bool AlreadyInit = false;
if (AlreadyInit)
return;
static llvm::once_flag InitializeRegisterBankFlag;
AlreadyInit = true;
static auto InitializeRegisterBankOnce = [this]() {
assert(&getRegBank(AMDGPU::SGPRRegBankID) == &AMDGPU::SGPRRegBank &&
&getRegBank(AMDGPU::VGPRRegBankID) == &AMDGPU::VGPRRegBank &&
&getRegBank(AMDGPU::AGPRRegBankID) == &AMDGPU::AGPRRegBank);
};
assert(&getRegBank(AMDGPU::SGPRRegBankID) == &AMDGPU::SGPRRegBank &&
&getRegBank(AMDGPU::VGPRRegBankID) == &AMDGPU::VGPRRegBank &&
&getRegBank(AMDGPU::AGPRRegBankID) == &AMDGPU::AGPRRegBank);
llvm::call_once(InitializeRegisterBankFlag, InitializeRegisterBankOnce);
}
static bool isVectorRegisterBank(const RegisterBank &Bank) {