https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46284
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |10.1.0, 11.3.0, 12.1.0,
| |13.1.0
Target Milestone|--- |10.0
Status|UNCONFIRMED |RESOLVED
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=28367,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=83518
Resolution|--- |FIXED
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fully fixed in GCC 10 (by r10-1692-g38988cbf9ebaa9):
main:
subq $8, %rsp
movl $.LC1, %edi
movl $4, %eax
movsd .LC0(%rip), %xmm0
movapd %xmm0, %xmm3
movapd %xmm0, %xmm2
movapd %xmm0, %xmm1
call printf
Just loading the constants to call printf.
In GCC 7-9 (improved most likely by PR 28367), GCC produces:
movl $.LC0, %edi
movl $4, %eax
movdqa .LC2(%rip), %xmm1
movdqa .LC1(%rip), %xmm0
addps %xmm1, %xmm0
movaps %xmm0, %xmm3
movaps %xmm0, %xmm2
movaps %xmm0, %xmm1
shufps $255, %xmm0, %xmm3
unpckhps %xmm0, %xmm2
shufps $85, %xmm0, %xmm1
cvtss2sd %xmm0, %xmm0
cvtss2sd %xmm3, %xmm3
cvtss2sd %xmm2, %xmm2
cvtss2sd %xmm1, %xmm1
call printf
Which is not bad and much better than before in GCC 6 (comment #0's code is
listed there).
