reg-stack.c (get_true_reg): Handle FLOAT_TRUNCATE like FLOAT_EXTEND if flag_unsafe_ma...

reg-stack.c (get_true_reg): Handle FLOAT_TRUNCATE like FLOAT_EXTEND if flag_unsafe_math_optimizations.

	* reg-stack.c (get_true_reg): Handle FLOAT_TRUNCATE like FLOAT_EXTEND
	if flag_unsafe_math_optimizations.
	* config/i386/i386.md (truncdfsf2): If flag_unsafe_math_optimizations
	and TARGET_80387 expand using truncdfsf2_noop pattern.
	(truncxfsf2): Likewise using truncxfsf2_noop.
	(truncxfdf2): Likewise using truncxfdf2_noop.
	(truncdfsf2_noop, truncxfsf2_noop, truncxfdf2_noop): New patterns.

From-SVN: r79893