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[NVPTX] Enable StructuredCFG for NVPTX
Summary: Make NVPTX require structured CFG. Added a temporary flag to "roll back" the behavior for easy deployment. Combined with D45008, this fixes several internal Nvidia GPU test failures that we suspect to be ptxas miscompiles (PR27738). Reviewers: jlebar Subscribers: jholewinski, sanjoy, llvm-commits, hiraditya Differential Revision: https://reviews.llvm.org/D45070 llvm-svn: 328885
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@ -44,6 +44,14 @@ static cl::opt<bool>
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cl::desc("Disable load/store vectorizer"),
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cl::init(false), cl::Hidden);
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// TODO: Remove this flag when we are confident with no regressions.
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static cl::opt<bool> DisableRequireStructuredCFG(
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"disable-nvptx-require-structured-cfg",
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cl::desc("Transitional flag to turn off NVPTX's requirement on preserving "
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"structured CFG. The requirement should be disabled only when "
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"unexpected regressions happen."),
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cl::init(false), cl::Hidden);
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namespace llvm {
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void initializeNVVMIntrRangePass(PassRegistry&);
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@ -108,6 +116,8 @@ NVPTXTargetMachine::NVPTXTargetMachine(const Target &T, const Triple &TT,
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drvInterface = NVPTX::NVCL;
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else
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drvInterface = NVPTX::CUDA;
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if (!DisableRequireStructuredCFG)
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setRequiresStructuredCFG(true);
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initAsmInfo();
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}
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