https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97715
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
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CC|hjl at gcc dot gnu.org |hjl.tools at gmail dot
com
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to qinzhao from comment #1)
> for -fzero-call-used-regs=all, when zeroing st/mm registers under x87 exit
> mode, However, command line option force no 80387 mode, the following insn
> generated to zero st registers is not recognized:
>
> (insn 27 67 28 2 (set (reg:XF 8 st)
> (const_double:XF 0.0 [0x0.0p+0])) "zero-scratch-regs-10.c":8:1 -1
> (nil))
You should avoid zeroing fixed registers.
