On Mon, 28 Jan 2013, Jakub Jelinek wrote:
2013-01-28 Jakub Jelinek <ja...@redhat.com>
PR tree-optimization/56125
* tree-ssa-math-opts.c (gimple_expand_builtin_pow): Don't optimize
pow(x,c) into sqrt(x) * powi(x, n/2) or
1.0 / (sqrt(x) * powi(x, abs(n/2))) if c is an integer or when
optimizing for size.
Don't optimize pow(x,c) into powi(x, n/3) * powi(cbrt(x), n%3) or
1.0 / (powi(x, abs(n)/3) * powi(cbrt(x), abs(n)%3)) if 2c is an
integer.
* gcc.dg/pr56125.c: New test.
Hello,
is there an implicit -lm in the testsuite?
The testcase now generates a library call to pow, like gcc-4.6. This is
correct, but I am surprised this is considered better than leaving the
original x/(n*n) unchanged... Should that be a different PR?
--
Marc Glisse
