clang/test/CodeGen/struct-copy.c

   1 // RUN: %clang_cc1 -emit-llvm %s -o - | FileCheck %s
   2 struct x { int a[100]; };
   3
   4
   5 void foo(struct x *P, struct x *Q) {
   6 // CHECK-LABEL: @foo(
   7 // CHECK:    call void @llvm.memcpy.p0.p0
   8   *P = *Q;
   9 }
  10
  11 // CHECK: declare void @llvm.memcpy.p0.p0{{.*}}(ptr noalias nocapture writeonly, ptr noalias nocapture readonly
  12
  13 void bar(struct x *P, struct x *Q) {
  14 // CHECK-LABEL: @bar(
  15 // CHECK:    call void @llvm.memcpy.p0.p0
  16   __builtin_memcpy(P, Q, sizeof(struct x));
  17 }