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Re: zero vector usagee (Was: Re: RFA: gcc.dg/simd-1.c fix for x86)

From: Aldy Hernandez <aldyh at redhat dot com>
To: Joern Rennecke <joern dot rennecke at superh dot com>
Cc: Daniel Egger <degger at fhm dot edu>, GCC Patches <gcc-patches at gcc dot gnu dot org>, gcc at gcc dot gnu dot org
Date: 08 Jul 2002 09:02:49 -0700
Subject: Re: zero vector usagee (Was: Re: RFA: gcc.dg/simd-1.c fix for x86)
References: <3D287F6F.E25C9323@superh.com> <1026066347.6648.2.camel@sonja.de.interearth.com> <3D296C3F.83381D5C@superh.com>

>>>>> "Joern" == Joern Rennecke <joern.rennecke@superh.com> writes:

 > zero.  We need to decide if using the zero vector is just optional,

No.  It's not optional.  Zeros must always be equivalent to
CONST0_RTX[MODE].  This is true across the board in gcc.  Vector
constants are no different.

 > I've used gen_rtx_CONST_VECTOR in some cases where it might
 > generate a zero.

Uhh, your patches might be causing Daniel's problems.

Aldy

References:
- RFA: gcc.dg/simd-1.c fix for x86
  - From: Joern Rennecke
- Re: RFA: gcc.dg/simd-1.c fix for x86
  - From: Daniel Egger
- zero vector usagee (Was: Re: RFA: gcc.dg/simd-1.c fix for x86)
  - From: Joern Rennecke

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