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[Bug target/49781] [x32] Unnecessary lea in x32 mode
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sun, 7 Aug 2011 13:09:25 +0000
- Subject: [Bug target/49781] [x32] Unnecessary lea in x32 mode
- Auto-submitted: auto-generated
- References: <bug-49781-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49781
--- Comment #30 from Uros Bizjak <ubizjak at gmail dot com> 2011-08-07 13:09:23 UTC ---
(In reply to comment #29)
> Created attachment 24938 [details]
> WIP patch that exploits addr32.
BTW: This patch also fixes following FAIL in [1]:
FAIL: gcc.target/i386/pr39543-3.c (test for excess errors)
and exposes interesting problem in combine in
FAIL: gcc.target/i386/pr43766.c scan-assembler-not lea[lq]?[ \\t]
where combine converts zero_extended address on-the-fly to an address involving
and. We can also recognize this as a valid address.
Trying 9 -> 10:
Failed to match this instruction:
(prefetch (and:DI (subreg:DI (plus:SI (ashift:SI (reg/v:SI 63 [ i ])
(const_int 2 [0x2]))
(subreg:SI (reg/v/f:DI 62 [ a ]) 0)) 0)
(const_int 4294967295 [0xffffffff]))
(const_int 0 [0])
(const_int 3 [0x3]))
[1] http://gcc.gnu.org/ml/gcc-testresults/2011-08/msg00601.html