re PR middle-end/29335 (transcendental functions with constant arguments should be resolved at compile-time)
PR middle-end/29335
* builtins.c (do_mpfr_arg2, fold_builtin_hypot): New.
(fold_builtin_pow): Evaluate constant arguments at compile-time
using MPFR.
(fold_builtin_1): Handle BUILT_IN_ATAN2 and BUILT_IN_HYPOT.
(do_mpfr_ckconv): New helper function.
(do_mpfr_arg1): Use do_mpfr_ckconv.
(do_mpfr_arg2): New.
testsuite:
* gcc.dg/builtins-20.c: Add tests for hypot.
* gcc.dg/torture/builtin-math-2.c (TESTIT2): New. Add tests for
two-argument builtins.
* gcc.dg/torture/builtin-math-3.c (TESTIT_R): Renamed from
TESTIT2. Update all callers.
(TESTIT2, TESTIT2_R): New helper macros.
Add testcases for pow, hypot and atan2.
From-SVN: r118129
