derek.holloway
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50 lines
2.6 KiB
C
50 lines
2.6 KiB
C
// Test that misexpect detects mis-annotated branches
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// test diagnostics are issued when profiling data mis-matches annotations
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// RUN: llvm-profdata merge %S/Inputs/misexpect-branch.proftext -o %t.profdata
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// RUN: %clang_cc1 %s -O2 -o - -emit-llvm -fprofile-instrument-use=clang -fprofile-instrument-use-path=%t.profdata -verify=imprecise -Wmisexpect
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// RUN: %clang_cc1 %s -O2 -o - -emit-llvm -fprofile-instrument-use=clang -fprofile-instrument-use-path=%t.profdata -verify=exact -Wmisexpect -debug-info-kind=line-tables-only
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// there should be no diagnostics when the tolerance is sufficiently high, or when -Wmisexpect is not requested
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// RUN: %clang_cc1 %s -O2 -o - -emit-llvm -fprofile-instrument-use=clang -fprofile-instrument-use-path=%t.profdata -verify=foo -fdiagnostics-misexpect-tolerance=10 -Wmisexpect -debug-info-kind=line-tables-only
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// RUN: %clang_cc1 %s -O2 -o - -disable-llvm-passes -emit-llvm -fprofile-instrument-use=clang -fprofile-instrument-use-path=%t.profdata -verify=foo
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// Ensure we emit an error when we don't use pgo with tolerance threshold
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// RUN: %clang_cc1 %s -O2 -o - -emit-llvm -fdiagnostics-misexpect-tolerance=10 -Wmisexpect -debug-info-kind=line-tables-only 2>&1 | FileCheck -check-prefix=NO_PGO %s
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// Test -fdiagnostics-misexpect-tolerance= requires pgo profile
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// NO_PGO: '-fdiagnostics-misexpect-tolerance=' requires profile-guided optimization information
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// foo-no-diagnostics
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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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int foo(int);
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int baz(int);
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int buzz();
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const int inner_loop = 100;
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const int outer_loop = 2000;
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int bar() { // imprecise-warning-re {{potential performance regression from use of __builtin_expect(): annotation was correct on {{.+}}% ({{[0-9]+ / [0-9]+}}) of profiled executions}}
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int rando = buzz();
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int x = 0;
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if (likely(rando % (outer_loop * inner_loop) == 0)) { // exact-warning-re {{potential performance regression from use of __builtin_expect(): annotation was correct on {{.+}}% ({{[0-9]+ / [0-9]+}}) of profiled executions}}
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x = baz(rando);
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} else {
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x = foo(50);
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}
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return x;
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}
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int fizz() { // imprecise-warning-re {{potential performance regression from use of __builtin_expect(): annotation was correct on {{.+}}% ({{[0-9]+ / [0-9]+}}) of profiled executions}}
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int rando = buzz();
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int x = 0;
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if (unlikely(rando % (outer_loop * inner_loop) == 0)) { // exact-warning-re {{potential performance regression from use of __builtin_expect(): annotation was correct on {{.+}}% ({{[0-9]+ / [0-9]+}}) of profiled executions}}
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x = baz(rando);
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} else {
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x = foo(50);
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}
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return x;
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}
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