https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88998
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |ubizjak at gmail dot com
--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 45503
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45503&action=edit
Proposed patch
We can use cvtdq2pd instead of cvtpi2pd and directly use xmm input register.
The patched compiler generates:
vmovd %edi, %xmm1
vpinsrd $1, %esi, %xmm1, %xmm0
vcvtdq2pd %xmm0, %xmm0
vhaddpd %xmm0, %xmm0, %xmm0
ret
which avoids MMX registers altogether.
The patch also amends cvtpd2pi/cvttpd2pi in a similar way, so it can output
directly to xmm register.
