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Re: [PATCH]: Add folding of builtin logb, ilogb and significand

From: "Richard Guenther" <richard dot guenther at gmail dot com>
To: "Kaveh R. GHAZI" <ghazi at caip dot rutgers dot edu>
Cc: gcc-patches at gcc dot gnu dot org
Date: Fri, 23 Feb 2007 10:38:56 +0100
Subject: Re: [PATCH]: Add folding of builtin logb, ilogb and significand
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On 2/23/07, Kaveh R. GHAZI <ghazi@caip.rutgers.edu> wrote:

This patch adds folding of builtin logb, ilogb and significand when they
are supplied with constant args.  I also mark significand as nonnegative
when it's argument is nonnegative.

Tested on sparc-sun-solaris2.10, no regressions.

Okay for mainline?

This is ok,

thanks,
Richard.

                Thanks,
                --Kaveh

2007-02-22 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>

        * builtins.c (fold_builtin_logb, fold_builtin_significand): New.
        (fold_builtin_1): Use them.
        * fold-const.c (tree_expr_nonnegative_warnv_p): Handle
        BUILT_IN_SIGNIFICAND.

testsuite:
        * gcc.dg/torture/builtin-logb-1.c: New test.
        * gcc.dg/torture/builtin-math-2.c: Test logb/ilogb.
        * gcc.dg/torture/builtin-nonneg-1.c: Test significand.

References:
- [PATCH]: Add folding of builtin logb, ilogb and significand
  - From: Kaveh R. GHAZI

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