clang/test/CodeGenCXX/no-opt-volatile-memcpy.cpp

   1 // RUN: %clang_cc1 -triple=x86_64-apple-darwin  -emit-llvm -o - %s | FileCheck %s
   2
   3 struct s {
   4   char filler [128];
   5   volatile int x;
   6 };
   7
   8 struct s gs;
   9
  10 void foo (void) {
  11   struct s ls;
  12   ls = ls;
  13   gs = gs;
  14   ls = gs;
  15 }
  16 // CHECK-LABEL: define{{.*}} void @_Z3foov()
  17 // CHECK: %[[LS:.*]] = alloca %struct.s, align 4
  18 // CHECK-NEXT:  call void @llvm.memcpy.{{.*}}(ptr align 4 %[[LS]], ptr align 4 %[[LS]], i64 132, i1 true)
  19 // CHECK-NEXT:  call void @llvm.memcpy.{{.*}}(ptr align 4 @gs, ptr align 4 @gs, i64 132, i1 true)
  20 // CHECK-NEXT:  call void @llvm.memcpy.{{.*}}(ptr align 4 %[[LS]], ptr align 4 @gs, i64 132, i1 true)
  21
  22
  23 struct s1 {
  24   struct s y;
  25 };
  26
  27 struct s1 s;
  28
  29 void fee (void) {
  30   s = s;
  31   s.y = gs;
  32 }
  33 // CHECK-LABEL: define{{.*}} void @_Z3feev()
  34 // CHECK: call void @llvm.memcpy.{{.*}}(ptr align 4 @s, ptr align 4 @s, i64 132, i1 true)
  35 // CHECK-NEXT: call void @llvm.memcpy.{{.*}}(ptr align 4 @s, ptr align 4 @gs, i64 132, i1 true)
  36
  37 struct d : s1 {
  38 };
  39
  40 d gd;
  41
  42 void gorf(void) {
  43   gd = gd;
  44 }
  45 // CHECK-LABEL: define{{.*}} void @_Z4gorfv()
  46 // CHECK:   call void @llvm.memcpy.{{.*}}(ptr align 4 @gd, ptr align 4 @gd, i64 132, i1 true)