From: Andreas Schwab <schwab@lamothe.informatik.uni-dortmund.de>
Date: Fri, 19 Apr 96 14:49:39 +0200
Message-Id: <9604191249.AA01009@lamothe.informatik.uni-dortmund.de>
To: linux-m68k@phil.uni-sb.de
Subject: L68K: [kenner@vlsi1.ultra.nyu.edu (Richard Kenner)] Re:  Invalid register allocation
X-Yow: I hope the ``Eurythmics'' practice birth control...
Sender: owner-linux-m68k@phil.uni-sb.de
Reply-To: schwab@issan.informatik.uni-dortmund.de

Hi!

For those who want to fix the register allocation bug in their
compiler, here's the patch that i've received.

Andreas.

------- Start of forwarded message -------
From: kenner@vlsi1.ultra.nyu.edu (Richard Kenner)
Subject: Re:  Invalid register allocation
To: schwab
Date: Sun, 14 Apr 96 20:49:23 -0400

Sun Apr 14 07:54:19 1996  Richard Kenner  (kenner@vlsi1.ultra.nyu.edu)

	* combine.c (try_combine): When substituting in output of I2,
	ensure dest isn't clobbered in I2.

*** combine.c.old	Sun Apr 14 08:16:16 1996
--- combine.c	Sun Apr 14 20:35:32 1996
*************** try_combine (i3, i2, i1)
*** 1308,1312 ****
  	 if another dest in I2 is an indirect memory ref.  */
        for (i = 0; i < XVECLEN (p2, 0); i++)
! 	if (GET_CODE (XVECEXP (p2, 0, i)) == SET
  	    && reg_overlap_mentioned_p (SET_DEST (PATTERN (i3)),
  					SET_DEST (XVECEXP (p2, 0, i))))
--- 1308,1313 ----
  	 if another dest in I2 is an indirect memory ref.  */
        for (i = 0; i < XVECLEN (p2, 0); i++)
! 	if ((GET_CODE (XVECEXP (p2, 0, i)) == SET
! 	     || GET_CODE (XVECEXP (p2, 0, i)) == CLOBBER)
  	    && reg_overlap_mentioned_p (SET_DEST (PATTERN (i3)),
  					SET_DEST (XVECEXP (p2, 0, i))))