Jeff Law <[EMAIL PROTECTED]> writes:
> Andreas Schwab wrote:
>> I'm testing IRA on m68k (with IRA_COVER_CLASSES defined to {
>> GENERAL_REGS, FP_REGS, LIM_REG_CLASSES }) and get a crash in
>> process_regs_for_copy. It is called with
>>
>> (insn 22 17 28 4 /cvs/gcc/libgcc/../gcc/libgcc2.c:169 (set (reg/i:SI 0 %d0)
>> (subreg:SI (reg/v:DI 30 [ w ]) 4)) 36 {*movsi_m68k2}
>> (expr_list:REG_DEAD (reg/v:DI 30 [ w ])
>> (nil)))
>>
>> and hard_regno becomes -1 due to offset2 == 1. I don't understand how
>> substracting offset2 from REGNO (reg1) can make sense here.
>>
>> Andreas.
>>
>>
> Do you have a testcase handy?
It's _mulvsi3.o from libgcc. The same problem exists on all 32-bit
big-endian targets, on little-endian the subreg offset is zero.
Andreas.
--
Andreas Schwab, SuSE Labs, [EMAIL PROTECTED]
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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