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[Bug rtl-optimization/47379] fwprop1 generates bad codes for x86-64
- From: "hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 02 Feb 2012 18:11:24 +0000
- Subject: [Bug rtl-optimization/47379] fwprop1 generates bad codes for x86-64
- Auto-submitted: auto-generated
- References: <bug-47379-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47379
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> 2012-02-02 18:11:24 UTC ---
(In reply to comment #4)
> Can you try after:
> 2011-12-19 Richard Sandiford <rdsandiford@googlemail.com>
>
> PR rtl-optimization/42839
> * fwprop.c (forward_propagate_subreg): Skip the SIGN/ZERO_EXTEND
> optimization if the source register is already extended.
GCC 4.7.0 20120131 still does it.