llvm::misexpect Namespace Reference

Functions
void	checkBackendInstrumentation (Instruction &I, const llvm::ArrayRef< uint32_t > RealWeights)
	checkBackendInstrumentation - compares PGO counters to the thresholds used for llvm.expect and warns if the PGO counters are outside of the expected range.
void	checkFrontendInstrumentation (Instruction &I, const ArrayRef< uint32_t > ExpectedWeights)
	checkFrontendInstrumentation - compares PGO counters to the thresholds used for llvm.expect and warns if the PGO counters are outside of the expected range.
void	verifyMisExpect (Instruction &I, ArrayRef< uint32_t > RealWeights, const ArrayRef< uint32_t > ExpectedWeights)
	veryifyMisExpect - compares RealWeights to the thresholds used for llvm.expect and warns if the PGO counters are outside of the expected range.
void	checkExpectAnnotations (Instruction &I, const ArrayRef< uint32_t > ExistingWeights, bool IsFrontend)
	checkExpectAnnotations - compares PGO counters to the thresholds used for llvm.expect and warns if the PGO counters are outside of the expected range.

Function Documentation

checkBackendInstrumentation()

void llvm::misexpect::checkBackendInstrumentation	(	Instruction &	I,
		const llvm::ArrayRef< uint32_t >	RealWeights
	)

checkBackendInstrumentation - compares PGO counters to the thresholds used for llvm.expect and warns if the PGO counters are outside of the expected range.

It extracts the expected weights from the MD_prof weights attatched to the instruction, which are are assumed to come from lowered llvm.expect intrinsics. The RealWeights parameter and the extracted expected weights are then passed to verifyMisexpect() for verification

Parameters

I	The Instruction being checked
RealWeights	A vector of profile weights for each target block

Definition at line 186 of file MisExpect.cpp.

References llvm::extractBranchWeights(), I, and verifyMisExpect().

Referenced by checkExpectAnnotations().

checkExpectAnnotations()

void llvm::misexpect::checkExpectAnnotations	(	Instruction &	I,
		const ArrayRef< uint32_t >	ExistingWeights,
		bool	IsFrontend
	)

checkExpectAnnotations - compares PGO counters to the thresholds used for llvm.expect and warns if the PGO counters are outside of the expected range.

It extracts the expected weights from the MD_prof weights attatched to the instruction, which are are assumed to come from lowered llvm.expect intrinsics. The RealWeights parameter and the extracted expected weights are then passed to verifyMisexpect() for verification. It is a thin wrapper around the checkFrontendInstrumentation and checkBackendInstrumentation APIs

Parameters

I	The Instruction being checked
ExistingWeights	A vector of profile weights for each target block
IsFrontend	A boolean describing if this is Frontend instrumentation

Definition at line 202 of file MisExpect.cpp.

References checkBackendInstrumentation(), checkFrontendInstrumentation(), and I.

Referenced by handleSwitchExpect(), and llvm::setProfMetadata().

checkFrontendInstrumentation()

void llvm::misexpect::checkFrontendInstrumentation	(	Instruction &	I,
		const ArrayRef< uint32_t >	ExpectedWeights
	)

checkFrontendInstrumentation - compares PGO counters to the thresholds used for llvm.expect and warns if the PGO counters are outside of the expected range.

It extracts the expected weights from the MD_prof weights attatched to the instruction, which are are assumed to come from profiling data attached by the frontend prior to llvm.expect intrinsic lowering. The ExpectedWeights parameter and the extracted real weights are then passed to verifyMisexpect() for verification

Parameters

I	The Instruction being checked
ExpectedWeights	A vector of the expected weights for each target block, this determines the threshold values used when emiting diagnostics

Definition at line 194 of file MisExpect.cpp.

References llvm::extractBranchWeights(), I, and verifyMisExpect().

Referenced by checkExpectAnnotations(), and handleBrSelExpect().

verifyMisExpect()

void llvm::misexpect::verifyMisExpect	(	Instruction &	I,
		ArrayRef< uint32_t >	RealWeights,
		const ArrayRef< uint32_t >	ExpectedWeights
	)

veryifyMisExpect - compares RealWeights to the thresholds used for llvm.expect and warns if the PGO counters are outside of the expected range.

Parameters

I	The Instruction being checked
RealWeights	A vector of profile weights from the profile data
ExpectedWeights	A vector of the weights attatch by llvm.expect

Definition at line 123 of file MisExpect.cpp.

References llvm::ArrayRef< T >::begin(), llvm::ArrayRef< T >::end(), End, llvm::BranchProbability::getBranchProbability(), I, Idx, LikelyBranchWeight, llvm::ArrayRef< T >::size(), and UnlikelyBranchWeight.

Referenced by checkBackendInstrumentation(), and checkFrontendInstrumentation().