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* builtins.c (fold_builtin_pow): Check for 0 ** NEGATIVE.

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From-SVN: r140833
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Daniel Jacobowitz 2008-10-02 15:15:40 +00:00 committed by Daniel Jacobowitz
parent 0d17b70a0a
commit 17372f8cc5
2 changed files with 10 additions and 2 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2008-10-02 Daniel Jacobowitz <dan@codesourcery.com>
* builtins.c (fold_builtin_pow): Check for 0 ** NEGATIVE.
2008-10-02 Richard Guenther <rguenther@suse.de>
PR middle-end/37713

8
gcc/builtins.c
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@ -8459,9 +8459,13 @@ fold_builtin_pow (tree fndecl, tree arg0, tree arg1, tree type)
real_from_integer (&cint, VOIDmode, n, n < 0 ? -1 : 0, 0);
if (real_identical (&c, &cint))
{
/* Attempt to evaluate pow at compile-time. */
/* Attempt to evaluate pow at compile-time, unless this should
raise an exception. */
if (TREE_CODE (arg0) == REAL_CST
&& !TREE_OVERFLOW (arg0))
&& !TREE_OVERFLOW (arg0)
&& (n > 0
|| (!flag_trapping_math && !flag_errno_math)
|| !REAL_VALUES_EQUAL (TREE_REAL_CST (arg0), dconst0)))
{
REAL_VALUE_TYPE x;
bool inexact;