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Subject: [Bug rtl-optimization/55247] [4.8 Regression] internal compiler error: Max. number of generated reload insns per insn is achieved (90)
Date: Sat, 10 Nov 2012 19:11:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55247

--- Comment #13 from H.J. Lu <hjl.tools at gmail dot com> 2012-11-10 19:11:03 UTC ---
(In reply to comment #12)
> (In reply to comment #11)
> > ~/gcc-build/gcc/cc1 -O2 -mx32 -maddress-mode=long pr55247.c
> > 
> > results in following sequence:
> > 
> >         movdqu  (%eax), %xmm0
> >         movdqa  %xmm0, (%rsp)
> >         movq    (%rsp), %rax
> >         movq    8(%rsp), %rdx
> >         movq    %rax, 16(%rsp)
> >         movq    %rdx, 24(%rsp)
> > 
> > while -maddress=mode=short produces expected code:
> > 
> >         movq    8(%eax), %rdx
> >         movq    (%eax), %rax
> >         movq    %rdx, 8(%esp)
> >         movq    %rax, (%esp)
> 
> This is related to PR 55259.  This patch:
> 
> http://gcc.gnu.org/ml/gcc-patches/2012-11/msg00799.html
> 
> fixes it.

With this fix, we don't need to change *movti_internal_rex64
since it generates redundant load/store.