[PATCH], Add PowerPC ISA 3.0 IEEE 128-bit floating point round to odd built-in functions

[Michael Meissner <meissner at linux dot vnet dot ibm dot com>]

This patch addss built-in functions on PowerPC ISA 3.0 (power9) that allow the
user to access the round to odd IEEE 128-bit floating point instructions.

I have checked it on a little endian power8 system doing a bootstrap and make
check.  There were no regressions in the testsuite.  I verified that the new
test (float128-odd.c) did run sucessfully.  Can I check this patch into the
trunk?

[gcc]
2017-09-28  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* config/rs6000/rs6000-builtin.def (BU_FLOAT128_2_HW): Define new
	helper macro for IEEE float128 hardware built-in functions.
	(SQRTF128_ODD): Add built-in functions with the round-to-odd
	semantics.
	(TRUNCF128_ODD): Likewise.
	(ADDF128_ODD): Likewise.
	(SUBF128_ODD): Likewise.
	(MULF128_ODD): Likewise.
	(DIVF128_ODD): Likewise.
	(FMAF128_ODD): Likewise.
	* config/rs6000/rs6000.md (trunc<mode>sf2_hw): Change the truncate
	with round to odd expansion to use float_truncate:DF inside of the
	UNSPEC to better document what the insn does.
	(add<mode>3_odd): Add insns for IEEE 128-bit floating point round
	to odd hardware instructions.
	(sub<mode>3_odd): Likewise.
	(mul<mode>3_odd): Likewise.
	(div<mode>3_odd): Likewise.
	(sqrt<mode>2_odd): Likewise.
	(fma<mode>4_odd): Likewise.
	(fms<mode>4_odd): Likewise.
	(nfma<mode>4_odd): Likewise.
	(nfms<mode>4_odd): Likewise.
	(trunc<mode>df2_odd): Change insn format to make it more readable,
	and add a generator function.
	* doc/extend.texi (PowerPC built-in functions): Update documentation
	for existing IEEE float128-bit built-in functions.  Add built-in
	functions that generate the IEEE 128-bit floating point round to
	odd instructions.

[gcc/testsuite]
2017-09-28  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* gcc.target/powerpc/float128-odd.c: New test.

-- 
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meissner@linux.vnet.ibm.com, phone: +1 (978) 899-4797

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