src/third_party/llvm-project/clang/test/CodeGen/struct-union-BE.c

// RUN: %clang_cc1 -triple mips-linux-gnu  -S -emit-llvm %s -o - | FileCheck %s -check-prefix=MIPS
// RUN: %clang_cc1 -triple mips64-linux-gnu  -S -emit-llvm %s -o - | FileCheck %s -check-prefix=MIPS64
// RUN: %clang_cc1 -triple armebv7-linux-gnueabihf -S -emit-llvm %s -o - | FileCheck %s -check-prefix=ARM

#include <stdarg.h>

extern void abort() __attribute__((noreturn));

struct tiny {
  char c;
};

union data {
  char c;
};

void fstr(int n, ...) {
  struct tiny x;
  va_list ap;
  va_start (ap,n);
  x = va_arg (ap, struct tiny);
  if (x.c !=  10)
    abort();
  va_end (ap);
// MIPS-NOT: %{{[0-9]+}} = getelementptr inbounds i8, i8* %argp.cur, i32 3
// MIPS64-NOT: %{{[0-9]+}} = getelementptr inbounds i8, i8* %argp.cur, i64 7
// ARM-NOT: %{{[0-9]+}} = getelementptr inbounds i8, i8* %argp.cur, i32 3
}

void funi(int n, ...) {
  union data x;
  va_list ap;
  va_start (ap,n);
  x = va_arg (ap, union data);
  if (x.c !=  10)
    abort();
  va_end (ap);
// MIPS-NOT: %{{[0-9]+}} = getelementptr inbounds i8, i8* %argp.cur, i32 3
// MIPS64-NOT: %{{[0-9]+}} = getelementptr inbounds i8, i8* %argp.cur, i64 7
// ARM-NOT: %{{[0-9]+}} = getelementptr inbounds i8, i8* %argp.cur, i32 3
}

void foo() {
  struct tiny x[3];
  union data y;
  x[0].c = 10;
  fstr(1, x[0]);
  funi(1, y);
}