[Bug target/44551] [missed optimization] AVX vextractf128 after vinsertf128

[hjl dot tools at gmail dot com]

------- Comment #11 from hjl dot tools at gmail dot com  2010-06-28 19:17 
-------
Testcase is

[...@gnu-6 44551]$ cat c.c
#include <immintrin.h>

__m128i
foo (__m256i x, __m128i y)
{
  __m256i r = _mm256_insertf128_si256(x, y, 1);
  __m128i a = _mm256_extractf128_si256(r, 1);
  return a;
}
[...@gnu-6 44551]$ make c.s
/export/build/gnu/gcc/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc/build-x86_64-linux/gcc/ -mavx -O2 -S c.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44551