clang/test/CodeGen/available-externally-suppress.c

   1 // RUN: %clang_cc1 -emit-llvm -o - -triple x86_64-apple-darwin10 %s | FileCheck %s
   2 // RUN: %clang_cc1 -O2 -fno-inline -emit-llvm -o - -triple x86_64-apple-darwin10 %s | FileCheck %s
   3 // RUN: %clang_cc1 -flto -O2 -fno-inline -emit-llvm -o - -triple x86_64-apple-darwin10 %s | FileCheck %s -check-prefix=LTO
   4
   5 // Ensure that we don't emit available_externally functions at -O0.
   6 // Also should not emit them at -O2, unless -flto is present in which case
   7 // we should preserve them for link-time inlining decisions.
   8 int x;
   9
  10 inline void f0(int y) { x = y; }
  11
  12 // CHECK-LABEL: define{{.*}} void @test()
  13 // CHECK: declare void @f0(i32 noundef)
  14 // LTO-LABEL: define{{.*}} void @test()
  15 // LTO: define available_externally void @f0
  16 void test(void) {
  17   f0(17);
  18 }
  19
  20 inline int __attribute__((always_inline)) f1(int x) {
  21   int blarg = 0;
  22   for (int i = 0; i < x; ++i)
  23     blarg = blarg + x * i;
  24   return blarg;
  25 }
  26
  27 // CHECK: @test1
  28 // LTO: @test1
  29 int test1(int x) {
  30   // CHECK-NOT: call {{.*}} @f1
  31   // CHECK: ret i32
  32   // LTO-NOT: call {{.*}} @f1
  33   // LTO: ret i32
  34   return f1(x);
  35 }