clang/test/Profile/c-unprofiled-blocks.c

   1 // Blocks that we have no profile data for (ie, it was never reached in training
   2 // runs) shouldn't have any branch weight metadata added.
   3
   4 // RUN: llvm-profdata merge %S/Inputs/c-unprofiled-blocks.proftext -o %t.profdata
   5 // 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
   6
   7 // PGOUSE-LABEL: @never_called(i32 noundef %i)
   8 int never_called(int i) {
   9   // PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}{{$}}
  10   if (i) {}
  11
  12   // PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}{{$}}
  13   for (i = 0; i < 100; ++i) {
  14   }
  15
  16   // PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}{{$}}
  17   while (--i) {}
  18
  19   // PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}, !llvm.loop [[LOOP1:!.*]]
  20   do {} while (i++ < 75);
  21
  22   // PGOUSE: switch {{.*}} [
  23   // PGOUSE-NEXT: i32 12
  24   // PGOUSE-NEXT: i32 82
  25   // PGOUSE-NEXT: ]{{$}}
  26   switch (i) {
  27   case 12: return 3;
  28   case 82: return 0;
  29   default: return 89;
  30   }
  31 }
  32
  33 // PGOUSE-LABEL: @dead_code(i32 noundef %i)
  34 int dead_code(int i) {
  35   // PGOUSE: br {{.*}}, !prof !{{[0-9]+}}
  36   if (i) {
  37     // This branch is never reached.
  38
  39     // PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}{{$}}
  40     if (!i) {}
  41
  42     // PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}{{$}}
  43     for (i = 0; i < 100; ++i) {
  44     }
  45
  46     // PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}{{$}}
  47     while (--i) {}
  48
  49     // PGOUSE: br i1 %{{[^,]*}}, label %{{[^,]*}}, label %{{[^,]*}}, !llvm.loop [[LOOP2:!.*]]
  50     do {} while (i++ < 75);
  51
  52     // PGOUSE: switch {{.*}} [
  53     // PGOUSE-NEXT: i32 12
  54     // PGOUSE-NEXT: i32 82
  55     // PGOUSE-NEXT: ]{{$}}
  56     switch (i) {
  57     case 12: return 3;
  58     case 82: return 0;
  59     default: return 89;
  60     }
  61   }
  62   return 2;
  63 }
  64
  65 // PGOUSE-LABEL: @main(i32 noundef %argc, ptr noundef %argv)
  66 int main(int argc, const char *argv[]) {
  67   dead_code(0);
  68   return 0;
  69 }