[gcc(refs/users/meissner/heads/work105y)] Undo patch

[gcc(refs/users/meissner/heads/work105y)] Undo patch

[Michael Meissner]

https://gcc.gnu.org/g:ac3c2b572b04621e230cd9d61c5372ff70cf07ee

commit ac3c2b572b04621e230cd9d61c5372ff70cf07ee
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Wed Jan 11 22:39:07 2023 -0500

    Undo patch

Diff:
---
 libgcc/config/rs6000/quad-float128.h | 19 ++++++++++++++++---
 libgcc/libgcc2.h                     |  5 -----
 libgcc/soft-fp/quad.h                |  2 --
 3 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/libgcc/config/rs6000/quad-float128.h b/libgcc/config/rs6000/quad-float128.h
index 3fa70d0e0a8..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__))
diff --git a/libgcc/libgcc2.h b/libgcc/libgcc2.h
index a39c365d904..fc24ac34502 100644
--- a/libgcc/libgcc2.h
+++ b/libgcc/libgcc2.h
@@ -156,14 +156,9 @@ typedef		float XFtype	__attribute__ ((mode (XF)));
 typedef _Complex float XCtype	__attribute__ ((mode (XC)));
 #endif
 #if LIBGCC2_HAS_TF_MODE
-/* PowerPC would like to override this to be _Float128.  */
-#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