c/8364: unable to find a register to spill in class `FLOAT_REGS'

c/8364: unable to find a register to spill in class `FLOAT_REGS'

[jean-marc.valin]

>Number:         8364
>Category:       c
>Synopsis:       unable to find a register to spill in class `FLOAT_REGS'
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Sat Oct 26 00:16:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     ?
>Release:        gcc 3.1 (and 3.2)
>Organization:
>Environment:
Linux/x86 (RedHat 7.2)
>Description:
When compiling a (valid) C file with -march=pentium4, I get an internal compiler error:
crash_gcc.c: In function `split_cb_search_shape_sign':
crash_gcc.c:86: unable to find a register to spill in class `FLOAT_REGS'
crash_gcc.c:86: this is the insn:
(insn 157 154 158 (set (reg:SF 8 st(0) [99])
        (subreg:SF (reg/v:DI 21 rxmm0 [75]) 0)) 90 {*movsf_1} (nil)
    (nil))
crash_gcc.c:86: confused by earlier errors, bailing out

This does not happen when I don't compile for pentium4. The file I attached was simplified as much as I could (it doesn't do anything useful anymore, but it's valid) but it doesn't seem like the problem is related to a single statement.

Also, depending on the exact content, I sometime get this error instead:
Internal compiler error in ix86_secondary_memory_needed, at config/i386/i386.c:12251
>How-To-Repeat:
gcc -march=pentium4 -O2 -c crash_gcc.c
>Fix:
?
>Release-Note:
>Audit-Trail:
>Unformatted:
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