clang/test/CodeGen/lifetime.c

   1 // RUN: %clang -S -emit-llvm -o - -O0 %s | FileCheck %s --implicit-check-not="call void @llvm.lifetime" -check-prefixes=CHECK
   2 // RUN: %clang -S -emit-llvm -o - -O1 %s | FileCheck %s --implicit-check-not="call void @llvm.lifetime" -check-prefixes=CHECK,LIFETIME
   3 // RUN: %clang -S -emit-llvm -o - -O2 %s | FileCheck %s --implicit-check-not="call void @llvm.lifetime" -check-prefixes=CHECK,LIFETIME
   4 // RUN: %clang -S -emit-llvm -o - -O3 %s | FileCheck %s --implicit-check-not="call void @llvm.lifetime" -check-prefixes=CHECK,LIFETIME
   5
   6 extern void use(char *a);
   7
   8 // CHECK-LABEL: @helper_no_markers
   9 __attribute__((always_inline)) void helper_no_markers(void) {
  10   char a;
  11   // LIFETIME: call void @llvm.lifetime.start.p0(i64 1,
  12   use(&a);
  13   // LIFETIME: call void @llvm.lifetime.end.p0(i64 1,
  14 }
  15
  16 // CHECK-LABEL: @lifetime_test
  17 void lifetime_test(void) {
  18 // LIFETIME: call void @llvm.lifetime.start.p0(i64 1,
  19   helper_no_markers();
  20 // LIFETIME: call void @llvm.lifetime.end.p0(i64 1,
  21 }