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Roger Sayle
authored
* builtins.c (fold_builtin): Optimize cos(-x) as cos(x). * fold-const.c (fold <NEGATE_EXPR>): Convert -f(x) into f(-x) when x is easily negated and f is sin, tan or atan. (fold <MULT_EXPR>): Optimize tan(x)*cos(x) and cos(x)*tan(x) as sin(x) with flag_unsafe_math_optimizations. (fold <RDIV_EXPR>): With flag_unsafe_math_optimizations fold sin(x)/cos(x) as tan(x) and cos(x)/sin(x) as 1.0/tan(x). * gcc.dg/builtins-20.c: New test case. From-SVN: r67701