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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
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