optimization/7124: -O2 -march=athlon produces ICE

[perrin at MSLI dot com]

>Number:         7124
>Category:       optimization
>Synopsis:       -O2 -march=athlon produces ICE
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 25 13:16:03 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Perrin Meyer
>Release:        gcc version 3.2 20020625 (experimental)
>Organization:
>Environment:
RedHat Linux 7.1 / Athlon 1.3GHz
>Description:
optimization flags -O2 -march=athlon produce an ICE.

clacrt.c: In function `clacrt_':
clacrt.c:136: error: unable to find a register to spill in class `FLOAT_REGS'
clacrt.c:136: error: this is the insn:
(insn:HI 109 108 112 9 0x401a6100 (set (subreg:SF (reg/v:DI 30 rmm1 [71]) 0)
        (minus:SF (reg:SF 12 st(4) [94])
            (reg:SF 8 st(0) [97]))) 556 {*fop_sf_1_nosse} (insn_list 107 (insn_list 104 (nil)))
    (expr_list:REG_DEAD (reg:SF 8 st(0) [97])
        (expr_list:REG_DEAD (reg:SF 12 st(4) [94])
            (nil))))
clacrt.c:136: internal compiler error: Internal compiler error in spill_failure, at reload1.c:1908
>How-To-Repeat:
gcc -c -O2 -march=athlon clacrt.i 

ICE does NOT happen for

gcc -c -O2 clacrt.i 
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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