https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54400
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot
gnu.org
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, with vectorizer support we get
<bb 2> [local count: 1073741824]:
_7 = .REDUC_PLUS (v_3(D)); [tail call]
return _7;
but
f:
.LFB5669:
.cfi_startproc
movapd %xmm0, %xmm1
unpckhpd %xmm0, %xmm0
addpd %xmm1, %xmm0
ret
(note avoiding hadd in the reduc pattern was intended). Not sure if
two element reduction vectorization is worthwhile - my current patch
bails w/o -fassociative-math (which is supposedly unnecessary for
two elements).
But mine anyway.
