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fold-const (fold_binary): Also optimize a/cbrt(b/c) into a*cbrt(c/b) if flag_unsafe_math_optimizations is set. 

* fold-const (fold_binary) [RDIV_EXPR]: Also optimize a/cbrt(b/c)
	into a*cbrt(c/b) if flag_unsafe_math_optimizations is set.

testuite/ChangeLog:

	* gcc.dg/builtins-11.c: Also check folding of a/cbrt(b/c).

From-SVN: r125641
This commit is contained in:
Uros Bizjak 2007-06-12 09:19:36 +02:00 committed by Uros Bizjak
parent f84c7ed946
commit 9883e373fc
4 changed files with 15 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2007-06-12 Uros Bizjak <ubizjak@gmail.com>
* fold-const (fold_binary) [RDIV_EXPR]: Also optimize a/cbrt(b/c)
into a*cbrt(c/b) if flag_unsafe_math_optimizations is set.
2007-06-11 Diego Novillo <dnovillo@google.com>
* Makefile.in (reload1.o-warn): Remove.

4
gcc/fold-const.c
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@ -10555,8 +10555,8 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1)
}
}
/* Optimize a/sqrt(b/c) into a*sqrt(c/b). */
if (BUILTIN_SQRT_P (fcode1))
/* Optimize a/root(b/c) into a*root(c/b). */
if (BUILTIN_ROOT_P (fcode1))
{
tree rootarg = CALL_EXPR_ARG (arg1, 0);

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2007-06-12 Uros Bizjak <ubizjak@gmail.com>
* gcc.dg/builtins-11.c: Also check folding of a/cbrt(b/c).
2007-06-12 Paul Thomas <pault@gcc.gnu.org>
PR fortran/29786

4
gcc/testsuite/gcc.dg/builtins-11.c
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@ -12,6 +12,7 @@ extern void link_error(void);
extern double exp(double);
extern double sqrt(double);
extern double cbrt(double);
extern double pow(double,double);
void test(double x, double y, double z)
@ -39,6 +40,9 @@ void test(double x, double y, double z)
if (x/sqrt(y/z) != x*sqrt(z/y))
link_error ();
if (x/cbrt(y/z) != x*cbrt(z/y))
link_error ();
}
int main()