clang/test/CodeGen/ifunc.c

   1 // RUN: %clang_cc1 -no-opaque-pointers -triple i386-unknown-linux-gnu -emit-llvm -o - %s | FileCheck %s
   2 // RUN: %clang_cc1 -no-opaque-pointers -triple i386-unknown-linux-gnu -O2 -emit-llvm -o - %s | FileCheck %s
   3
   4 int foo(int) __attribute__ ((ifunc("foo_ifunc")));
   5
   6 static int f1(int i) {
   7   return i + 1;
   8 }
   9
  10 static int f2(int i) {
  11   return i + 2;
  12 }
  13
  14 typedef int (*foo_t)(int);
  15
  16 int global;
  17
  18 static foo_t foo_ifunc(void) {
  19   return global ? f1 : f2;
  20 }
  21
  22 int bar(void) {
  23   return foo(1);
  24 }
  25
  26 extern void goo(void);
  27
  28 void bar2(void) {
  29   goo();
  30 }
  31
  32 extern void goo(void) __attribute__ ((ifunc("goo_ifunc")));
  33
  34 void* goo_ifunc(void) {
  35   return 0;
  36 }
  37 // CHECK: @foo = ifunc i32 (i32), i32 (i32)* ()* @foo_ifunc
  38 // CHECK: @goo = ifunc void (), bitcast (i8* ()* @goo_ifunc to void ()* ()*)
  39
  40 // CHECK: call i32 @foo(i32
  41 // CHECK: call void @goo()