union-tbaa2.cpp
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// 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
// Testcase from llvm.org/PR32056
extern "C" int printf (const char *__restrict __format, ...);
typedef double __m256d __attribute__((__vector_size__(32)));
static __inline __m256d __attribute__((__always_inline__, __nodebug__,
__target__("avx")))
_mm256_setr_pd(double __a, double __b, double __c, double __d) {
return (__m256d){ __a, __b, __c, __d };
}
struct A {
A () {
// Check that the TBAA information generated for the stores to the
// union members is based on the omnipotent char.
// CHECK: store <4 x double>
// CHECK: tbaa ![[OCPATH:[0-9]+]]
// CHECK: store <4 x double>
// CHECK: tbaa ![[OCPATH]]
// CHECK: call
a = _mm256_setr_pd(0.0, 1.0, 2.0, 3.0);
b = _mm256_setr_pd(4.0, 5.0, 6.0, 7.0);
}
const double *begin() { return c; }
const double *end() { return c+8; }
union {
struct { __m256d a, b; };
double c[8];
};
};
int main(int argc, char *argv[]) {
A a;
for (double value : a)
printf("%f ", value);
return 0;
}
// CHECK-DAG: ![[CHAR:[0-9]+]] = !{!"omnipotent char"
// CHECK-DAG: ![[OCPATH]] = !{![[CHAR]], ![[CHAR]], i64 0}