gcc/testsuite/gcc.target/i386/pr81502.c

   1 /* { dg-do compile { target lp64 } } */
   2 /* { dg-options "-O2 -msse2" } */
   3
   4 #include <emmintrin.h>
   5
   6 #define SIZE (sizeof (void *))
   7
   8 static int foo(unsigned char (*foo)[SIZE])
   9 {
  10   __m128i acc = _mm_set_epi32(0, 0, 0, 0);
  11   size_t i = 0;
  12   for(; i + sizeof(__m128i) <= SIZE; i += sizeof(__m128i)) {
  13       __m128i word;
  14       __builtin_memcpy(&word, foo + i, sizeof(__m128i));
  15       acc = _mm_add_epi32(word, acc);
  16   }
  17   if (i != SIZE) {
  18       __m128i word = _mm_set_epi32(0, 0, 0, 0);
  19       __builtin_memcpy(&word, foo + i, SIZE - i); // (1)
  20       acc = _mm_add_epi32(word, acc);
  21   }
  22   int res;
  23   __builtin_memcpy(&res, &acc, sizeof(res));
  24   return res;
  25 }
  26
  27 int bar(void *ptr)
  28 {
  29   unsigned char buf[SIZE];
  30   __builtin_memcpy(buf, &ptr, SIZE);
  31   return foo((unsigned char(*)[SIZE])buf);
  32 }
  33
  34 /* { dg-final { scan-assembler-times "mov" 1 } } */