ac73b73c16
Since C++11, the C++ standard has a forward progress guarantee [intro.progress], so all such functions must have the `mustprogress` requirement. In addition, from C11 and onwards, loops without a non-zero constant conditional or no conditional are also required to make progress (C11 6.8.5p6). This patch implements these attribute deductions so they can be used by the optimization passes. Differential Revision: https://reviews.llvm.org/D86841
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
// Blocks that we have no profile data for (ie, it was never reached in training
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// runs) shouldn't have any branch weight metadata added.
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// RUN: llvm-profdata merge %S/Inputs/c-unprofiled-blocks.proftext -o %t.profdata
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// RUN: %clang_cc1 -triple x86_64-apple-macosx10.9 -main-file-name c-unprofiled-blocks.c %s -o - -emit-llvm -fprofile-instrument-use-path=%t.profdata | FileCheck -check-prefix=PGOUSE %s
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// PGOUSE-LABEL: @never_called(i32 %i)
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int never_called(int i) {
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// PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}{{$}}
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if (i) {}
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// PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}{{$}}
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for (i = 0; i < 100; ++i) {
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}
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// PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}{{$}}
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while (--i) {}
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// PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}, !llvm.loop [[LOOP1:!.*]]
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do {} while (i++ < 75);
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// PGOUSE: switch {{.*}} [
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// PGOUSE-NEXT: i32 12
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// PGOUSE-NEXT: i32 82
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// PGOUSE-NEXT: ]{{$}}
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switch (i) {
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case 12: return 3;
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case 82: return 0;
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default: return 89;
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}
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}
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// PGOUSE-LABEL: @dead_code(i32 %i)
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int dead_code(int i) {
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// PGOUSE: br {{.*}}, !prof !{{[0-9]+}}
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if (i) {
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// This branch is never reached.
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// PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}{{$}}
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if (!i) {}
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// PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}{{$}}
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for (i = 0; i < 100; ++i) {
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}
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// PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}{{$}}
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while (--i) {}
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// PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}, !llvm.loop [[LOOP2:!.*]]
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do {} while (i++ < 75);
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// PGOUSE: switch {{.*}} [
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// PGOUSE-NEXT: i32 12
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// PGOUSE-NEXT: i32 82
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// PGOUSE-NEXT: ]{{$}}
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switch (i) {
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case 12: return 3;
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case 82: return 0;
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default: return 89;
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}
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}
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return 2;
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}
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// PGOUSE-LABEL: @main(i32 %argc, i8** %argv)
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int main(int argc, const char *argv[]) {
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dead_code(0);
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return 0;
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}
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