Crash in process_regs_for_copy

Andreas Schwab schwab@suse.de
Mon Sep 8 12:21:00 GMT 2008


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.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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