[gcc(refs/users/meissner/heads/work078)] Use correct names for __ibm128 if long double is IEEE 128-bit.

[Michael Meissner]

https://gcc.gnu.org/g:71a7116e72859825a419efd6971a3bfff8f25697

commit 71a7116e72859825a419efd6971a3bfff8f25697
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Tue Feb 8 16:46:01 2022 -0500

    Use correct names for __ibm128 if long double is IEEE 128-bit.
    
    If you are on a PowerPC system where the default long double is IEEE
    128-bit, GCC will use the wrong names for some of the conversion functions
    for the __ibm128 type.
    
    What is happening is when the defult long double is IEEE 128-bit, the
    various convert, truncation, and extend functions did not specify a
    default name for the conversion.  The machine indepentent portions of the
    compiler would construct a call with an 'if' name (IFmode being the mode
    for IBM 128-bit floating point).  This patch specifies to use the
    tradiational 'tf' name for these conversion functions.
    
    2022-02-08  Michael Meissner  <meissner@the-meissners.org>
    
    gcc/
            PR target/104253
            * config/rs6000/rs6000.cc (init_float128_ibm): Use the TF names
            for builtin conversions between __ibm128 and DImode when long
            double uses the IEEE 128-bit format.
    
    gcc/testsuite/
            PR target/104253
            * gcc.target/powerpc/pr104253.c: New test.

Diff:
---
 gcc/config/rs6000/rs6000.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index e2d94421ae9..f56cf66313a 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -10984,6 +10984,12 @@ init_float128_ibm (machine_mode mode)
       set_conv_libfunc (trunc_optab, DDmode, mode, "__dpd_trunctfdd");
       set_conv_libfunc (sext_optab, TDmode, mode, "__dpd_extendtftd");
 
+      set_conv_libfunc (sfix_optab, DImode, mode, "__fixtfdi");
+      set_conv_libfunc (ufix_optab, DImode, mode, "__fixunstfdi");
+
+      set_conv_libfunc (sfloat_optab, mode, DImode, "__floatditf");
+      set_conv_libfunc (ufloat_optab, mode, DImode, "__floatunditf");
+
       if (TARGET_POWERPC64)
 	{
 	  set_conv_libfunc (sfix_optab, TImode, mode, "__fixtfti");