[PATCH] Fix PR61441 introduced regression (PR tree-optimization/69070)

[Jeff Law]

On 12/31/2015 02:29 AM, Jakub Jelinek wrote:
> Hi!
>
> The PR61441 change added REAL_VALUE_ISSIGNALING_NAN checks for both
> operands, but only arg1 is guaranteed to be a REAL_CST at this point.
> If arg0 is not a REAL_CST, I think we can allow all the opts the function
> does, as all transformations replace the pow with some other expression
> that uses the argument some way (sqrt, cbrt, cbrt of sqrt, multiplication by
> itself, ...), so sNaN exteptions should be preserved.
>
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
>
> 2015-12-31  Jakub Jelinek  <jakub@redhat.com>
>
> 	PR tree-optimization/69070
> 	* tree-ssa-math-opts.c (gimple_expand_builtin_pow): Only test
> 	REAL_VALUE_ISSIGNALING_NAN on arg0 if arg0 is a REAL_CST.
>
> 	* gcc.dg/pr69070.c: New test.
OK.
jeff