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Re: [PATCH] Fix PR69291, RTL if-conversion bug

From: Bernd Schmidt <bschmidt at redhat dot com>
To: Richard Biener <rguenther at suse dot de>
Cc: gcc-patches at gcc dot gnu dot org
Date: Wed, 10 Feb 2016 14:44:11 +0100
Subject: Re: [PATCH] Fix PR69291, RTL if-conversion bug
Authentication-results: sourceware.org; auth=none
References: <alpine dot LSU dot 2 dot 11 dot 1602101400100 dot 31122 at t29 dot fhfr dot qr> <56BB3B64 dot 3040606 at redhat dot com> <alpine dot LSU dot 2 dot 11 dot 1602101430430 dot 31122 at t29 dot fhfr dot qr> <alpine dot LSU dot 2 dot 11 dot 1602101434590 dot 31122 at t29 dot fhfr dot qr>

On 02/10/2016 02:35 PM, Richard Biener wrote:

Index: gcc/ifcvt.c
===================================================================
--- gcc/ifcvt.c (revision 233262)
+++ gcc/ifcvt.c (working copy)
@@ -1274,7 +1274,8 @@ noce_try_store_flag_constants (struct no
        && CONST_INT_P (XEXP (a, 1))
        && CONST_INT_P (XEXP (b, 1))
        && rtx_equal_p (XEXP (a, 0), XEXP (b, 0))
-      && noce_operand_ok (XEXP (a, 0))
+      && (REG_P (XEXP (a, 0))
+         || ! reg_mentioned_p (if_info->x, XEXP (a, 0)))


I guess that would also work. Could maybe use a brief comment.


Bernd

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  - From: Richard Biener

References:
- [PATCH] Fix PR69291, RTL if-conversion bug
  - From: Richard Biener
- Re: [PATCH] Fix PR69291, RTL if-conversion bug
  - From: Bernd Schmidt
- Re: [PATCH] Fix PR69291, RTL if-conversion bug
  - From: Richard Biener
- Re: [PATCH] Fix PR69291, RTL if-conversion bug
  - From: Richard Biener

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