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* builtins.c (dconstpi, dconste): New mathematical constants. (init_builtin_dconsts): New function to initialize dconstpi and dconste. (fold_builtin): Optimize exp(1.0) = e. Evaluate exp(x) at compile time with -ffast-math when x is an integer constant. Optimize tan(0.0) = 0.0. Optimize atan(0.0) = 0.0, atan(1.0) = pi/4 and tan(atan(x)) = x with -ffast-math. * gcc.dg/builtins-2.c: Add tests for tan(atan(x)). * gcc.dg/builtins-3.c: Add tests for tan(0.0) and atan(0.0). * gcc.dg/builtins-7.c: Add tests for tan(atan(x)) == x. * gcc.dg/builtins-17.c: New test case. * gcc.dg/i386-387-4.c: New test case. * gcc.c-torture/execute/ieee/mzero4.c: New test case. From-SVN: r67438
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