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Print vectorization analysis when loop hint is specified. 

This patche and a related llvm patch solve the problem of having to explicitly enable analysis when specifying a loop hint pragma to get the diagnostics. Passing AlwasyPrint as the pass name (see below) causes the front-end to print the diagnostic if the user has specified '-Rpass-analysis' without an '=<target-pass>’. Users of loop hints can pass that compiler option without having to specify the pass and they will get diagnostics for only those loops with loop hints.

llvm-svn: 244556
This commit is contained in:
Tyler Nowicki 2015-08-11 01:10:08 +00:00
parent c94d6ad241
commit 65061a293b
2 changed files with 42 additions and 15 deletions
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36
clang/lib/CodeGen/CodeGenAction.cpp
View File

@ -495,33 +495,39 @@ void BackendConsumer::OptimizationRemarkHandler(
void BackendConsumer::OptimizationRemarkHandler(
const llvm::DiagnosticInfoOptimizationRemarkAnalysis &D) {
// Optimization analysis remarks are active only if the -Rpass-analysis
// flag has a regular expression that matches the name of the pass
// name in \p D.
if (CodeGenOpts.OptimizationRemarkAnalysisPattern &&
CodeGenOpts.OptimizationRemarkAnalysisPattern->match(D.getPassName()))
// Optimization analysis remarks are active if the pass name is set to
// llvm::DiagnosticInfo::AlwasyPrint or if the -Rpass-analysis flag has a
// regular expression that matches the name of the pass name in \p D.
if (D.getPassName() == llvm::DiagnosticInfo::AlwaysPrint ||
(CodeGenOpts.OptimizationRemarkAnalysisPattern &&
CodeGenOpts.OptimizationRemarkAnalysisPattern->match(D.getPassName())))
EmitOptimizationMessage(
D, diag::remark_fe_backend_optimization_remark_analysis);
}
void BackendConsumer::OptimizationRemarkHandler(
const llvm::DiagnosticInfoOptimizationRemarkAnalysisFPCommute &D) {
// Optimization analysis remarks are active only if the -Rpass-analysis
// flag has a regular expression that matches the name of the pass
// name in \p D.
if (CodeGenOpts.OptimizationRemarkAnalysisPattern &&
CodeGenOpts.OptimizationRemarkAnalysisPattern->match(D.getPassName()))
// Optimization analysis remarks are active if the pass name is set to
// llvm::DiagnosticInfo::AlwasyPrint or if the -Rpass-analysis flag has a
// regular expression that matches the name of the pass name in \p D.
if (D.getPassName() == llvm::DiagnosticInfo::AlwaysPrint ||
(CodeGenOpts.OptimizationRemarkAnalysisPattern &&
CodeGenOpts.OptimizationRemarkAnalysisPattern->match(D.getPassName())))
EmitOptimizationMessage(
D, diag::remark_fe_backend_optimization_remark_analysis_fpcommute);
}
void BackendConsumer::OptimizationRemarkHandler(
const llvm::DiagnosticInfoOptimizationRemarkAnalysisAliasing &D) {
// Optimization analysis remarks are active only if the -Rpass-analysis
// flag has a regular expression that matches the name of the pass
// name in \p D.
if (CodeGenOpts.OptimizationRemarkAnalysisPattern &&
CodeGenOpts.OptimizationRemarkAnalysisPattern->match(D.getPassName()))
// Optimization analysis remarks are active if the pass name is set to
// llvm::DiagnosticInfo::AlwasyPrint or if the -Rpass-analysis flag has a
// regular expression that matches the name of the pass name in \p D.
if (D.getPassName() == llvm::DiagnosticInfo::AlwaysPrint ||
(CodeGenOpts.OptimizationRemarkAnalysisPattern &&
CodeGenOpts.OptimizationRemarkAnalysisPattern->match(D.getPassName())))
EmitOptimizationMessage(
D, diag::remark_fe_backend_optimization_remark_analysis_aliasing);
}

21
clang/test/Frontend/optimization-remark-analysis.c Normal file
View File

@ -0,0 +1,21 @@
// RUN: %clang -O1 -fvectorize -emit-llvm -Rpass-analysis -S %s -o - 2>&1 | FileCheck %s --check-prefix=RPASS
// RUN: %clang -O1 -fvectorize -emit-llvm -S %s -o - 2>&1 | FileCheck %s
// RPASS: {{.*}}:21:1: remark: loop not vectorized: loop contains a switch statement
// CHECK-NOT: {{.*}}:21:1: remark: loop not vectorized: loop contains a switch statement
double foo(int N, int *Array) {
double v = 0.0;
#pragma clang loop vectorize(enable)
for (int i = 0; i < N; i++) {
switch(Array[i]) {
case 0: v += 1.0f; break;
case 1: v -= 0.5f; break;
case 2: v *= 2.0f; break;
default: v = 0.0f;
}
}
return v;
}