[gcc(refs/users/meissner/heads/work106)] Revert patches

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

https://gcc.gnu.org/g:972623a3b60e325baeba3f703f1caa9974f88eda

commit 972623a3b60e325baeba3f703f1caa9974f88eda
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Tue Jan 17 20:56:58 2023 -0500

    Revert patches

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

diff --git a/libgcc/config/rs6000/quad-float128.h b/libgcc/config/rs6000/quad-float128.h
index c3f9f48bf97..ae0622c744c 100644
--- a/libgcc/config/rs6000/quad-float128.h
+++ b/libgcc/config/rs6000/quad-float128.h
@@ -27,9 +27,22 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-/* Override quad.h's definitions for 128-bit floating point type.  */
-#define TFtype _Float128
-#define TCtype _Complex _Float128
+/* 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
 
 /* Force the use of the VSX instruction set.  */
 #if defined(_ARCH_PPC) && (!defined(__VSX__) || !defined(__FLOAT128__))
@@ -174,6 +187,10 @@ 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 6a249877c7a..fc24ac34502 100644
--- a/libgcc/libgcc2.h
+++ b/libgcc/libgcc2.h
@@ -156,13 +156,9 @@ 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 71f87d36ba9..3889bb44f1f 100644
--- a/libgcc/soft-fp/quad.h
+++ b/libgcc/soft-fp/quad.h
@@ -65,9 +65,7 @@
 #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