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Re: [PATCH] Fix endless recursion in make_vector_type (PR tree-opt/29637; 4.[0123] regression cause by PR c/29092 fix)

From: Mark Mitchell <mark at codesourcery dot com>
To: Richard Kenner <kenner at vlsi1 dot ultra dot nyu dot edu>
Cc: gcc-patches at gcc dot gnu dot org, jakub at redhat dot com, paolo dot bonzini at lu dot unisi dot ch, roger at eyesopen dot com
Date: Mon, 30 Oct 2006 07:54:32 -0800
Subject: Re: [PATCH] Fix endless recursion in make_vector_type (PR tree-opt/29637; 4.[0123] regression cause by PR c/29092 fix)
References: <Pine.LNX.4.44.0610291448080.16396-100000@www.eyesopen.com> <45457699.1070403@codesourcery.com> <10610301055.AA10837@vlsi1.ultra.nyu.edu> <45461811.9040703@codesourcery.com> <10610301537.AA15539@vlsi1.ultra.nyu.edu>

Richard Kenner wrote:

The fact that "semantic" type attributes are variants is a bug, precisely because it then causes the compiler to think that two types with different semantic attributes are the same.
I agree with that.  My point, however, is that if there *is* an attribute
for which we decide to allow two different states of that attribute to be
variants, the TYPE_MAIN_VARIANT should be the type *without* the attribute.

Certainly. Non-semantic attributes are just typedefs, with extra-lingual properties associated with the new type name, e.g., "don't warn about uses of this type".

--
Mark Mitchell
CodeSourcery
mark@codesourcery.com
(650) 331-3385 x713

References:
- Re: [PATCH] Fix endless recursion in make_vector_type (PR tree-opt/29637; 4.[0123] regression cause by PR c/29092 fix)
  - From: Roger Sayle
- Re: [PATCH] Fix endless recursion in make_vector_type (PR tree-opt/29637; 4.[0123] regression cause by PR c/29092 fix)
  - From: Mark Mitchell
- Re: [PATCH] Fix endless recursion in make_vector_type (PR tree-opt/29637; 4.[0123] regression cause by PR c/29092 fix)
  - From: Richard Kenner
- Re: [PATCH] Fix endless recursion in make_vector_type (PR tree-opt/29637; 4.[0123] regression cause by PR c/29092 fix)
  - From: Mark Mitchell
- Re: [PATCH] Fix endless recursion in make_vector_type (PR tree-opt/29637; 4.[0123] regression cause by PR c/29092 fix)
  - From: Richard Kenner

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