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point expression ignoring the sign of the...
* fold-const.c (fold_strip_sign_ops): New function to simplify a
floating point expression ignoring the sign of the result.
(fold) <ABS_EXPR>: Use it to simplify fabs(x).
(fold) <MULT_EXPR>: Use it to simplify x*x.
* tree.h (fold_strip_sign_ops): Prototype here.
* builtins.c (fold_builtin_copysign): Take an additional FNDECL
argument. Use fold_strip_sign_ops to simplify the first argument.
(fold_builtin_pow): Use fold_strip_sign_ops to simplify the
first argument when the second argument is an even integer
constant, but only with -funsafe_math_optimizations.
(fold_builtin_1): Update call to fold_builtin_copysign.
* gcc.dg/builtins-48.c: New test case.
* gcc.dg/builtins-49.c: New test case.
* gcc.dg/builtins-50.c: New test case.
* gcc.dg/builtins-51.c: New test case.
From-SVN: r94779
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