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Re: Understanding integer_cst

From: Nathan Sidwell <nathan at codesourcery dot com>
To: Primrose dot Mbanefo at Infineon dot com
Cc: ian at airs dot com, gcc-help at gcc dot gnu dot org
Date: Thu, 08 Dec 2005 11:40:33 +0000
Subject: Re: Understanding integer_cst
References: <BBBAD038CF62944F8BC0E9B2351EC5220156AB63@mucse205.eu.infineon.com>

Primrose.Mbanefo@Infineon.com wrote:

Does your expectation mean that TREE_INT_CST_HIGHs purpose is solely as
a sign indicator or does this indicate that 16 can also be repesented
even though sixteen would not fit in HOST_BITS_PER_WIDE_INT bits?

The latter.

TREE_INT_CST have two halves precisely so the compiler can represent numbers twice as large as that supported by the compiler the compiler was compiled with.

thus HOST_BITS_PER_WIDE_INT is half the size of what an integer_cst can represent.

nathan

--
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

References:
- RE: Understanding integer_cst
  - From: Primrose.Mbanefo

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