[gcc(refs/users/meissner/heads/work106)] Use _Float128 and _Complex _Float128 for PowerPC libgcc IEEE 128-bit

[Michael Meissner <meissner@gcc.gnu.org>]

https://gcc.gnu.org/g:22dd6dfc52ef1ab02426be4aa436511f53941be0

commit 22dd6dfc52ef1ab02426be4aa436511f53941be0
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Tue Jan 17 19:09:34 2023 -0500

    Use _Float128 and _Complex _Float128 for PowerPC libgcc IEEE 128-bit
    
    2023-01-17   Michael Meissner  <meissner@linux.ibm.com>
    
            PR target/107299
            * config/rs6000/quad-float128.h (TF): Remove definition.
            (TFtype): New macro, use _Float128.
            (TCtype): Change to macro, use _Complex _Float128.
            (__mulkc3): Remove declaration.
            (__divkc3): Likewise.
            * libgcc2.h (TFtype): Allow md files to override this.
            (TCtype): Likewise.
            * soft-fp/quad.h (TFtype): Likewise.

Diff:
---
 libgcc/config/rs6000/quad-float128.h | 23 +++--------------------
 libgcc/libgcc2.h                     |  4 ++++
 libgcc/soft-fp/quad.h                |  2 ++
 3 files changed, 9 insertions(+), 20 deletions(-)

diff --git a/libgcc/config/rs6000/quad-float128.h b/libgcc/config/rs6000/quad-float128.h
index ae0622c744c..c3f9f48bf97 100644
--- a/libgcc/config/rs6000/quad-float128.h
+++ b/libgcc/config/rs6000/quad-float128.h
@@ -27,22 +27,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-/* quad.h defines the TFtype type by:
-   typedef float TFtype __attribute__ ((mode (TF)));
-
-   This define forces it to use KFmode (aka, ieee 128-bit floating point).
-   However, when the compiler's default is changed so that long double is IEEE
-   128-bit floating point, we need to go back to using TFmode and TCmode.  */
-#ifndef __LONG_DOUBLE_IEEE128__
-#define TF KF
-
-/* We also need TCtype to represent complex ieee 128-bit float for
-   __mulkc3 and __divkc3.  */
-typedef __complex float TCtype __attribute__ ((mode (KC)));
-
-#else
-typedef __complex float TCtype __attribute__ ((mode (TC)));
-#endif
+/* Override quad.h's definitions for 128-bit floating point type.  */
+#define TFtype _Float128
+#define TCtype _Complex _Float128
 
 /* Force the use of the VSX instruction set.  */
 #if defined(_ARCH_PPC) && (!defined(__VSX__) || !defined(__FLOAT128__))
@@ -187,10 +174,6 @@ extern UTItype_ppc __fixunskfti (TFtype);
 extern IBM128_TYPE __extendkftf2 (TFtype);
 extern TFtype __trunctfkf2 (IBM128_TYPE);
 
-/* Complex __float128 built on __float128 interfaces.  */
-extern TCtype __mulkc3 (TFtype, TFtype, TFtype, TFtype);
-extern TCtype __divkc3 (TFtype, TFtype, TFtype, TFtype);
-
 /* Convert IEEE 128-bit floating point to/from string.  We explicitly use
    _Float128 instead of TFmode because _strtokf and _strfromkf must be compiled
    with long double being IBM 128.  */
diff --git a/libgcc/libgcc2.h b/libgcc/libgcc2.h
index fc24ac34502..6a249877c7a 100644
--- a/libgcc/libgcc2.h
+++ b/libgcc/libgcc2.h
@@ -156,9 +156,13 @@ typedef		float XFtype	__attribute__ ((mode (XF)));
 typedef _Complex float XCtype	__attribute__ ((mode (XC)));
 #endif
 #if LIBGCC2_HAS_TF_MODE
+#ifndef TFtype
 typedef		float TFtype	__attribute__ ((mode (TF)));
+#endif
+#ifndef TCtype
 typedef _Complex float TCtype	__attribute__ ((mode (TC)));
 #endif
+#endif
 
 typedef int cmp_return_type __attribute__((mode (__libgcc_cmp_return__)));
 typedef int shift_count_type __attribute__((mode (__libgcc_shift_count__)));
diff --git a/libgcc/soft-fp/quad.h b/libgcc/soft-fp/quad.h
index 3889bb44f1f..71f87d36ba9 100644
--- a/libgcc/soft-fp/quad.h
+++ b/libgcc/soft-fp/quad.h
@@ -65,7 +65,9 @@
 #define _FP_HIGHBIT_DW_Q	\
   ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_Q - 1) % _FP_W_TYPE_SIZE)
 
+#ifndef TFtype
 typedef float TFtype __attribute__ ((mode (TF)));
+#endif
 
 #if _FP_W_TYPE_SIZE < 64