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[avr-gcc-list] ICE in push_reload for avr

From: Pitchumani Sivanupandi
Subject: [avr-gcc-list] ICE in push_reload for avr
Date: Tue, 15 Mar 2016 14:10:42 +0530
User-agent: Mutt/1.5.24 (2015-08-30)

Hi Johann,

There is an ICE in push_reload for AVR target which is very similar to
PR64452. Attached the test case (options: -mmcu=atmega1280 -O1).

PR64452's fix makes the virtual reloads in one chunk for push operation.
What is the significance to address the virtuals only in range of

I tried below split to load the symbol reference to register before
doing the arithmetic on it. This avoids the defect, but it is un-optimal
and may split RTLs for non-push operations also.

  [(set (match_operand:HI 0 "register_operand" "")
        (const:HI (plus:HI (match_operand:HI 1 "symbol_ref_operand" "")
                      (match_operand:ALL2 2 "immediate_operand" ""))))]
   && (REGNO (operands[0]) >= FIRST_VIRTUAL_REGISTER)"
  [(set (match_dup 0)
        (match_dup 1))
   (set (match_dup 0)
        (plus:HI (match_dup 0)
                 (match_dup 2)))])

Any suggestions?


Attachment: ice-reload-avr.c
Description: Text document

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