Re: [PATCH #2], make Float128 built-in functions work with -mabi=ieeelongdouble

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

David tells me that the patch to enable float128 built-in functions to work
with the -mabi=ieeelongdouble option broke AIX because on AIX, the float128
insns are disabled, and they all become CODE_FOR_nothing.  The switch statement
that was added in rs6000.c to map KFmode built-in functions to TFmode breaks
under AIX.

I changed the code to have a separate table, and the first call, I build the
table.  If the insn was not generated, it will just be CODE_FOR_nothing, and
the KF->TF mode conversion will not be done.

I have tested this on a little endian power8 system and there were no
regressions.  Once David verifies that it builds on AIX, can I check this into
the trunk?

2017-11-15  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (rs6000_expand_builtin): Do not use a
	switch to map KFmode built-in functions to TFmode.

-- 
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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