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optimization/7246: ICE in find_reloads, at reload.c:3576
- From: gbeauchesne at mandrakesoft dot com
- To: gcc-gnats at gcc dot gnu dot org
- Cc: jakub at redhat dot com, rth at redhat dot com
- Date: 9 Jul 2002 15:47:58 -0000
- Subject: optimization/7246: ICE in find_reloads, at reload.c:3576
- Reply-to: gbeauchesne at mandrakesoft dot com
>Number: 7246
>Category: optimization
>Synopsis: ICE in find_reloads, at reload.c:3576
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: ice-on-legal-code
>Submitter-Id: net
>Arrival-Date: Tue Jul 09 08:56:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Gwenole Beauchesne
>Release: GNU C version 3.1.1 20020709 (prerelease)
>Organization:
>Environment:
i586-mandrake-linux-gnu
>Description:
Testcase attached, distilled from <ffmpeg>/libavcodec/h263.c.
[gb@kernel gcc]$ ./cc1 -O ~/vrac/h263.i
g f
h263.c: In function `f':
h263.c:26: unable to generate reloads for:
(insn 51 45 52 (parallel[
(set (reg:CCZ 17 flags)
(compare:CCZ (lshiftrt:SI (reg:SI 0 eax [63])
(const_int -13 [0xfffffff3]))
(const_int 0 [0x0])))
(set (reg/v:SI 0 eax [61])
(lshiftrt:SI (reg:SI 0 eax [63])
(const_int -13 [0xfffffff3])))
] ) 456 {*lshrsi3_cmp} (insn_list 19 (nil))
(expr_list:REG_DEAD (reg:SI 0 eax [63])
(nil)))
h263.c:26: Internal compiler error in find_reloads, at reload.c:3576
>How-To-Repeat:
- GCC ICEs on the testcase for any optimization level >= 1.
- That doesn't occur on x86_64.
- This is a regression from 3.0.4, i.e. it ICEs with 3.1.0 too.
>Fix:
Workaround: undefine ARCH_X86 -or- compile without optimization.
>Release-Note:
>Audit-Trail:
>Unformatted:
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