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optimization/5887: Internal compiler error in extract_insn

From: roman at idecnet dot com
To: gcc-gnats at gcc dot gnu dot org
Date: 8 Mar 2002 18:36:29 -0000
Subject: optimization/5887: Internal compiler error in extract_insn
Reply-to: roman at idecnet dot com


>Number:         5887
>Category:       optimization
>Synopsis:       Internal compiler error in extract_insn
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 08 10:46:02 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Roman Dudek
>Release:        3.2 20020303 (experimental)
>Organization:
>Environment:
System: Linux redhat 2.4.9-13SGI_XFS_1.0.2 #1 Thu Nov 15 11:38:50 CST 2001 i686 unknown
Architecture: i686

        <machine, os, target, libraries (multiple lines)>
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ./configure  : (reconfigured) ./configure --prefix /usr/bin : (reconfigured) ./configure --prefix=/usr : (reconfigured) ./configure --prefix=/usr
>Description:
compiling the attached code witth:

   gcc bug1.cpp -O3 -msse  -ffast-math

the comiler reports internal error:

bug1.cpp: In function `void fillLookup(char*)':
bug1.cpp:23: unrecognizable insn:
(insn 275 274 276 (set (reg:CCFP 17 flags)
        (compare:CCFP (reg:SF 21 exmm0 [78])
            (mem/f:SF (plus:SI (reg/f:SI 6 ebp)
                    (const_int -268 [0xfffffef4])) [3 S4 A32]))) -1 (nil)
    (nil))
bug1.cpp:23: Internal compiler error in extract_insn, at recog.c:2131
>How-To-Repeat:
compiling the attached code witth:

   gcc bug1.cpp -O3 -msse  -ffast-math
>Fix:
Workaround: reduce optimization for this file 
(dropping -ffast-math prevents the bug)
>Release-Note:
>Audit-Trail:
>Unformatted:
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