https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65368
--- Comment #9 from Jakub Jelinek jakub at gcc dot gnu.org ---
Author: jakub
Date: Tue Mar 10 21:03:21 2015
New Revision: 221335
URL: https://gcc.gnu.org/viewcvs?rev=221335root=gccview=rev
Log:
PR target/65368
* config/i386/i386.md
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65368
--- Comment #7 from Uroš Bizjak ubizjak at gmail dot com ---
(In reply to Jakub Jelinek from comment #6)
To some extent BZHI is a special case of BEXTR, but I'm afraid any
generalization is much harder due to the weirdo encoding of the
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65368
--- Comment #5 from Uroš Bizjak ubizjak at gmail dot com ---
(In reply to Jakub Jelinek from comment #3)
For zero_extract RTL we require that the POS and LEN arguments are in the
right ranges, while bextr allows any values, and either uses 0
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65368
--- Comment #6 from Jakub Jelinek jakub at gcc dot gnu.org ---
(In reply to Uroš Bizjak from comment #5)
(In reply to Jakub Jelinek from comment #3)
For zero_extract RTL we require that the POS and LEN arguments are in the
right ranges,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65368
--- Comment #8 from Uroš Bizjak ubizjak at gmail dot com ---
(In reply to Uroš Bizjak from comment #7)
Probably I didn't form the question in the right way - I was trying to point
out, if we also describe BEXTR without unspec (in a similar way
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65368
Jakub Jelinek jakub at gcc dot gnu.org changed:
What|Removed |Added
Keywords||wrong-code
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65368
Jakub Jelinek jakub at gcc dot gnu.org changed:
What|Removed |Added
Status|NEW |ASSIGNED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65368
--- Comment #2 from Uroš Bizjak ubizjak at gmail dot com ---
(In reply to Jakub Jelinek from comment #1)
Wonder how many other bmi/bmi2 instructions have similar problems.
Looking through i386.md file, it looks others are OK, although it is
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65368
--- Comment #3 from Jakub Jelinek jakub at gcc dot gnu.org ---
For zero_extract RTL we require that the POS and LEN arguments are in the right
ranges, while bextr allows any values, and either uses 0 for bits outside of
the original operand and
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65368
--- Comment #4 from Uroš Bizjak ubizjak at gmail dot com ---
(In reply to Jakub Jelinek from comment #1)
Created attachment 35000 [details]
gcc5-pr65368.patch
The problem is that the RTL pattern for bzhi doesn't really match what the
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