clang/test/CodeGenCXX/union-tbaa2.cpp

   1 // RUN: %clang_cc1 %s -O1 -std=c++11 -triple x86_64-unknown-linux-gnu -target-cpu x86-64 -target-feature +sse4.2 -target-feature +avx -emit-llvm -o - | FileCheck %s
   2
   3 // Testcase from llvm.org/PR32056
   4
   5 extern "C" int printf (const char *__restrict __format, ...);
   6
   7 typedef double __m256d __attribute__((__vector_size__(32)));
   8
   9 static __inline __m256d __attribute__((__always_inline__, __nodebug__,
  10                                        __target__("avx")))
  11 _mm256_setr_pd(double __a, double __b, double __c, double __d) {
  12   return (__m256d){ __a, __b, __c, __d };
  13 }
  14
  15 struct A {
  16   A () {
  17 // Check that the TBAA information generated for the stores to the
  18 // union members is based on the omnipotent char.
  19 // CHECK: store <4 x double>
  20 // CHECK: tbaa ![[OCPATH:[0-9]+]]
  21 // CHECK: store <4 x double>
  22 // CHECK: tbaa ![[OCPATH]]
  23     a = _mm256_setr_pd(0.0, 1.0, 2.0, 3.0);
  24     b = _mm256_setr_pd(4.0, 5.0, 6.0, 7.0);
  25   }
  26
  27   const double *begin() { return c; }
  28   const double *end() { return c+8; }
  29
  30   union {
  31     struct { __m256d a, b; };
  32     double c[8];
  33   };
  34 };
  35
  36 int main(int argc, char *argv[]) {
  37   A a;
  38   for (double value : a)
  39     printf("%f ", value);
  40   return 0;
  41 }
  42
  43 // CHECK-DAG: ![[CHAR:[0-9]+]] = !{!"omnipotent char"
  44 // CHECK-DAG: ![[OCPATH]] = !{![[CHAR]], ![[CHAR]], i64 0}