Using gcc version 4.2.0 20051217 (experimental) to compile the attached
testcase like this
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gcc -O2 -fgcse-sm -c -o mjpeg.o mjpeg.c
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I get the following:
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mjpeg.c: In function mjpeg_picture_trailer:
mjpeg.c:566: error: unrecognizable insn:
(insn:HI 452 282 286 27 (set (reg:SI 186 [ bit_buf ])
(ashift:SI (mem/s:SI (plus:SI (reg/v/f:SI 109 [ s ])
(const_int 84 [0x54])) [4 <variable>.pb.bit_buf+0 S4 A32])
(subreg:QI (reg/v:SI 90 [ bit_left ]) 0))) -1 (nil)
(expr_list:REG_DEAD (reg/v:SI 90 [ bit_left ])
(nil)))
mjpeg.c:566: internal compiler error: in extract_insn, at recog.c:2084
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
-------------------------------
on both x86 and x86_64 architectures.
--
Summary: Unrecognizable insn with -O2 -fgcse-sm
Product: gcc
Version: 4.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: drab at kepler dot fjfi dot cvut dot cz
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25475
