rs6000, Add return value to __builtin_set_fpscr_rn

Change the return value from void to double for __builtin_set_fpscr_rn.
The return value consists of the FPSCR fields DRN, VE, OE, UE, ZE, XE, NI,
RN bit positions.  A new test file, test powerpc/test_fpscr_rn_builtin_2.c,
is added to test the new return value for the built-in.

The value __SET_FPSCR_RN_RETURNS_FPSCR__ is defined if
__builtin_set_fpscr_rn returns a double.

gcc/ChangeLog:
	* config/rs6000/rs6000-builtins.def (__builtin_set_fpscr_rn): Update
	built-in definition return type.
	* config/rs6000/rs6000-c.cc (rs6000_target_modify_macros): Add check,
	define __SET_FPSCR_RN_RETURNS_FPSCR__ macro.
	* config/rs6000/rs6000.md (rs6000_set_fpscr_rn): Add return
	argument to return FPSCR fields.
	* doc/extend.texi (__builtin_set_fpscr_rn): Update description for
	the return value.  Add description for
	__SET_FPSCR_RN_RETURNS_FPSCR__ macro.

gcc/testsuite/ChangeLog:
	* gcc.target/powerpc/test_fpscr_rn_builtin.c: Rename to
	test_fpscr_rn_builtin_1.c.  Add comment.
	* gcc.target/powerpc/test_fpscr_rn_builtin_2.c: New test for the
	return value of __builtin_set_fpscr_rn builtin.

0 files changed, 0 insertions, 0 deletions