clang/test/CodeGen/extend-variable-liveness.c

   1 // RUN: %clang_cc1 %s -triple x86_64-unknown-linux-gnu -emit-llvm -fextend-variable-liveness -o - | FileCheck %s --implicit-check-not=llvm.fake.use
   2 // Check that fake use calls are emitted at the correct locations, i.e.
   3 // at the end of lexical blocks and at the end of the function.
   4
   5 int glob_i;
   6 char glob_c;
   7 float glob_f;
   8
   9 int foo(int i) {
  10   // CHECK-LABEL: define{{.*}}foo
  11   if (i < 4) {
  12     char j = i * 3;
  13     if (glob_i > 3) {
  14       float f = glob_f;
  15       j = f;
  16       glob_c = j;
  17       // CHECK: call void (...) @llvm.fake.use(float %
  18       // CHECK-NEXT: br label %
  19     }
  20     glob_i = j;
  21     // CHECK: call void (...) @llvm.fake.use(i8 %
  22     // CHECK-NEXT: br label %
  23   }
  24   // CHECK: call void (...) @llvm.fake.use(i32 %
  25   // CHECK-NEXT: ret
  26   return 4;
  27 }
  28
  29 // CHECK: declare void @llvm.fake.use(...)