http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47000
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
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CC| |hubicka at gcc dot gnu.org
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> 2010-12-18 15:36:30
UTC ---
(In reply to comment #3)
> Compiled like so:
> $ gcc-4.4.2 -S -O2 sha256_4way.i -o sha256_4way-44.s
> $ gcc-4.5.0 -S -O2 sha256_4way.i -o sha256_4way-45.s
>
> $ grep -c call *.s
> sha256_4way-44.s:0
> sha256_4way-45.s:484
> $ grep call *.s|head
> sha256_4way-45.s: call ROTR
> sha256_4way-45.s: call ROTR
> sha256_4way-45.s: call ROTR
> sha256_4way-45.s: call ROTR
> sha256_4way-45.s: call ROTR
> sha256_4way-45.s: call ROTR
> sha256_4way-45.s: call ROTR
> sha256_4way-45.s: call ROTR
> sha256_4way-45.s: call ROTR
> sha256_4way-45.s: call ROTR
> $
>
> ROTR should have been inlined:
>
> static inline __m128i ROTR(__m128i x, const int n) {
> return _mm_srli_epi32(x, n) | _mm_slli_epi32(x, 32 - n);
> }
>
> This probably explains the slowdown.
This is caused by revision 151511:
http://gcc.gnu.org/ml/gcc-cvs/2009-09/msg00257.html
