[Bug rtl-optimization/50063] [4.6/4.7 Regression] DSE: wrong code for gcc.dg/torture/pta-ptrarith-3.c

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50063

--- Comment #21 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2012-02-22 
09:25:48 UTC ---
Author: gjl
Date: Wed Feb 22 09:25:35 2012
New Revision: 184461

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=184461
Log:
    PR rtl-optimization/50063
    * config/avr/avr.md (movhi_sp_r): Handle -1 (unknown IRQ state)
    and 2 (8-bit SP) in operand 2.
    * config/avr/avr.c (avr_prologue_setup_frame): Adjust prologue
    setup to use movhi_sp_r instead of vanilla move to write SP.
    Adjust REG_CFA notes to superseed unspec.
    (expand_epilogue): Adjust epilogue setup to use movhi_sp_r instead
    of vanilla move.
    As function body might contain CLI or SEI: Use irq_state 0 (IRQ
    known to be off) only with TARGET_NO_INTERRUPTS. Never use
    irq_state 1 (IRQ known to be on) here.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/avr/avr.c
    trunk/gcc/config/avr/avr.md