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Re: [PATCH, rtl-optimization]: Fix PR rtl-optimization/33846, ICE in trunc_int_for_mode, at explow.c:55

From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
To: ebotcazou at libertysurf dot fr
Cc: gcc-patches at gcc dot gnu dot org, paolo dot bonzini at lu dot unisi dot ch, ubizjak at gmail dot com
Date: Tue, 23 Oct 2007 07:36:49 EDT
Subject: Re: [PATCH, rtl-optimization]: Fix PR rtl-optimization/33846, ICE in trunc_int_for_mode, at explow.c:55
References: <5787cf470710220352j1100c674l5dcb7e2ff4299cbb@mail.gmail.com> <200710231214.37572.ebotcazou@libertysurf.fr> <5787cf470710230317g69ed5a3cg70fcbc39272cdb56@mail.gmail.com> <200710231220.48619.ebotcazou@libertysurf.fr>

> > IIUC, this code also converts NOT (x) into XOR (x, -1).
> 
> OK, but is this a win if you cannot further combine?

No.  But it normally doesn't make its way to the new insns if you can't
further combine (I wrote that code LONG ago).

Follow-Ups:
- Re: [PATCH, rtl-optimization]: Fix PR rtl-optimization/33846, ICE in trunc_int_for_mode, at explow.c:55
  - From: Eric Botcazou

References:
- Re: [PATCH, rtl-optimization]: Fix PR rtl-optimization/33846, ICE in trunc_int_for_mode, at explow.c:55
  - From: Uros Bizjak
- Re: [PATCH, rtl-optimization]: Fix PR rtl-optimization/33846, ICE in trunc_int_for_mode, at explow.c:55
  - From: Eric Botcazou
- Re: [PATCH, rtl-optimization]: Fix PR rtl-optimization/33846, ICE in trunc_int_for_mode, at explow.c:55
  - From: Uros Bizjak
- Re: [PATCH, rtl-optimization]: Fix PR rtl-optimization/33846, ICE in trunc_int_for_mode, at explow.c:55
  - From: Eric Botcazou

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