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Re: [PATCH] fix possible FP reassociation problem in simplify-rtx.c

From: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
To: Richard Guenther <richard dot guenther at gmail dot com>
Cc: Paolo Bonzini <bonzini at gnu dot org>, gcc-patches at gcc dot gnu dot org
Date: Wed, 09 Aug 2006 09:38:32 +0200
Subject: Re: [PATCH] fix possible FP reassociation problem in simplify-rtx.c
References: <dm2stk$oh4$1@sea.gmane.org> <84fc9c000608090037g72afbab3k59895f5046e81608@mail.gmail.com>

This introduces a missed optimization (and so hides wrong-code PR28651).
simplify_plus_minus (MINUS, SImode, op0, op1) no longer simplifies

(gdb) call debug_rtx (op0)
(plus:SI (reg/v:SI 59 [ u ])
   (const_int 4 [0x4]))
(gdb) call debug_rtx (op1)
(reg/v:SI 59 [ u ])

There is a PR already assigned to me about this.

Paolo

References:
- Re: [PATCH] fix possible FP reassociation problem in simplify-rtx.c
  - From: Richard Guenther

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