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Date: Wed, 04 Dec 2002 14:05:00 -0000
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To: demon_lord@myrealbox.com, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
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From: bangerth@dealii.org
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Subject: Re: optimization/8737: ICE in spill_failure, at reload1.c:1916 with SSE 
X-SW-Source: 2002-12/txt/msg00245.txt.bz2
List-Id: <gcc-prs.sourceware.org>

Old Synopsis: Pentium4 + SSE: register to spill in class 'FLOAT_REGS' [minimal example]
New Synopsis: ICE in spill_failure, at reload1.c:1916 with SSE 

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Wed Dec  4 14:05:13 2002
State-Changed-Why:
    Confirmed. With 3.2.2pre I get
    tmp/g> /home/bangerth/bin/gcc-3.2.2-pre/bin/gcc -march=pentium4 -O -mfpmath=sse -c x.c
    x.c: In function `main':
    x.c:17: unable to find a register to spill in class `FLOAT_REGS'
    x.c:17: this is the insn:
    (insn 52 50 53 (set (subreg:SF (reg/v:DI 22 rxmm1 [67]) 0)
            (float:SF (reg:DI 0 rax [73]))) 170 {*floatdisf2_i387_only} (nil)
        (nil))
    x.c:17: confused by earlier errors, bailing out
    
    
    3.3pre gives a slightly different message, but dies as well:
    tmp/g> /home/bangerth/bin/gcc-3.3-pre/bin/gcc -march=pentium4 -O -mfpmath=sse -c x.c
    x.c: In function `main':
    x.c:17: error: unable to find a register to spill in class `FLOAT_REGS'
    x.c:17: error: this is the insn:
    (insn 40 39 41 2 0x401812c0 (set (subreg:SF (reg/v:DI 22 rxmm1 [67]) 0)
            (float:SF (reg:DI 0 rax [73]))) 126 {*floatdisf2_i387_only} (nil)
        (nil))
    x.c:17: internal compiler error: in spill_failure, at reload1.c:1916
    Please submit a full bug report,
    with preprocessed source if appropriate.
    See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8737