[gcc(refs/users/meissner/heads/work095)] Make __float128 and __ibm128 use different types from long double.

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

https://gcc.gnu.org/g:feeb0b0bb7109aa026263ea8d071ecd78e907ae0

commit feeb0b0bb7109aa026263ea8d071ecd78e907ae0
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Fri Jul 29 01:56:45 2022 -0400

    Make __float128 and __ibm128 use different types from long double.
    
    2022-07-29   Michael Meissner  <meissner@linux.ibm.com>
    
    gcc/
    
            * config/rs6000/rs6000-builtin.cc (rs6000_init_builtins): Always
            create a new tree node for __ibm128, even if long double uses the IBM
            128-bit format.  Always create a new tree node for __float128, even if
            long double uses the IEEE 128-bit format.
            * config/rs6000/rs600.cc (rs6000_expand_builtin): Remove code that
            converted the KFmode and IFmode built-in functions to TFmode depending
            on what the long double format is, and use built-in overloading
            instead.
            (init_float128_ieee): Remove setting up KFmode complex multiply and
            divide here.
            (rs6000_init_libfuncs): Rewrite the setup for complex multiply and
            divide for long double if long double uses the IEEE 128-bit encoding.
            (rs6000_scalar_mode_supported_p): Allow __ibm128 even if we don't
            support _Float128.
            (rs6000_libgcc_floating_mode_supported_p): Allow KFmode if IEEE
            128-bit floating point is supported.  Allow IFmode if either IEEE
            128-bit floating point is supported or long double is IBM 128-bit.
            (rs6000_floatn_mode): Always return KFmode for IEEE 128-bit.  Do not
            return TFmode, even if long double uses the IEEE 128-bit format.
            (rs6000_c_mode_for_suffix): The 'q' suffix always uses KFmode, even if
            long double uses the IEEE 128-bit encoding.
            * config/rs6000/rs6000.md (IFKF): Delete.
            (IFKF_reg): Delete.
            (trunckfif2): New insn.
            (trunctfif2): Likewise.
            (extendkftf2_internal): Split extend<mode>tf2_internal and
            extendtf<mode>2_internal into separate insns that handle either
            conversions between IEEE 128-bit types or between IBM 128-bit types.
            Set the type and insn length correctly.
            (extendtfkf2_internal): Likewise.
            (extendiftf2_internal): Likewise.
            (extendtfif2_internal): Likewise.
    
    gcc/testsuite/
    
            * gcc.target/powerpc/mulkc3-2.c: Update test.
            * gcc.target/powerpc/divkc3-2.c: Likewise.
    
    libgcc/
    
            * config/rs6000/float128-ifunc.c (__multc3_ieee128): Add ifunc
            support.
            (__divtc3_ieee128): Likewise.
            * config/rs6000/quad-float128.h (__multc3_ieee128): Add
            declaration.
            (__divtc3_ieee128): Likewise.

Diff:
---
 gcc/config/rs6000/rs6000-builtin.cc         | 111 ++--------------------------
 gcc/config/rs6000/rs6000.cc                 |  80 +++++++++++---------
 gcc/config/rs6000/rs6000.md                 |  94 ++++++++++++++++++-----
 gcc/testsuite/gcc.target/powerpc/divkc3-2.c |   2 +-
 gcc/testsuite/gcc.target/powerpc/mulkc3-2.c |   2 +-
 libgcc/config/rs6000/float128-ifunc.c       |   6 ++
 libgcc/config/rs6000/quad-float128.h        |   5 ++
 7 files changed, 138 insertions(+), 162 deletions(-)

diff --git a/gcc/config/rs6000/rs6000-builtin.cc b/gcc/config/rs6000/rs6000-builtin.cc
index 67e86bee781..601232148f8 100644
--- a/gcc/config/rs6000/rs6000-builtin.cc
+++ b/gcc/config/rs6000/rs6000-builtin.cc
@@ -719,18 +719,12 @@ rs6000_init_builtins (void)
      For IEEE 128-bit floating point, always create the type __ieee128.  If the
      user used -mfloat128, rs6000-c.cc will create a define from __float128 to
      __ieee128.  */
-  if (TARGET_LONG_DOUBLE_128 && (!TARGET_IEEEQUAD || TARGET_FLOAT128_TYPE))
+  if (TARGET_IBM128)
     {
-      if (!TARGET_IEEEQUAD)
-	ibm128_float_type_node = long_double_type_node;
-      else
-	{
-	  ibm128_float_type_node = make_node (REAL_TYPE);
-	  TYPE_PRECISION (ibm128_float_type_node) = 128;
-	  SET_TYPE_MODE (ibm128_float_type_node, IFmode);
-	  layout_type (ibm128_float_type_node);
-	}
-      t = build_qualified_type (ibm128_float_type_node, TYPE_QUAL_CONST);
+      ibm128_float_type_node = make_node (REAL_TYPE);
+      TYPE_PRECISION (ibm128_float_type_node) = 128;
+      SET_TYPE_MODE (ibm128_float_type_node, IFmode);
+      layout_type (ibm128_float_type_node);
       lang_hooks.types.register_builtin_type (ibm128_float_type_node,
 					      "__ibm128");
     }
@@ -739,11 +733,7 @@ rs6000_init_builtins (void)
 
   if (TARGET_FLOAT128_TYPE)
     {
-      if (TARGET_IEEEQUAD && TARGET_LONG_DOUBLE_128)
-	ieee128_float_type_node = long_double_type_node;
-      else
-	ieee128_float_type_node = float128_type_node;
-      t = build_qualified_type (ieee128_float_type_node, TYPE_QUAL_CONST);
+      ieee128_float_type_node = float128_type_node;
       lang_hooks.types.register_builtin_type (ieee128_float_type_node,
 					      "__ieee128");
     }
@@ -3302,79 +3292,6 @@ rs6000_expand_builtin (tree exp, rtx target, rtx /* subtarget */,
   size_t uns_fcode = (size_t)fcode;
   enum insn_code icode = rs6000_builtin_info[uns_fcode].icode;
 
-  /* TODO: The following commentary and code is inherited from the original
-     builtin processing code.  The commentary is a bit confusing, with the
-     intent being that KFmode is always IEEE-128, IFmode is always IBM
-     double-double, and TFmode is the current long double.  The code is
-     confusing in that it converts from KFmode to TFmode pattern names,
-     when the other direction is more intuitive.  Try to address this.  */
-
-  /* We have two different modes (KFmode, TFmode) that are the IEEE
-     128-bit floating point type, depending on whether long double is the
-     IBM extended double (KFmode) or long double is IEEE 128-bit (TFmode).
-     It is simpler if we only define one variant of the built-in function,
-     and switch the code when defining it, rather than defining two built-
-     ins and using the overload table in rs6000-c.cc to switch between the
-     two.  If we don't have the proper assembler, don't do this switch
-     because CODE_FOR_*kf* and CODE_FOR_*tf* will be CODE_FOR_nothing.  */
-  if (FLOAT128_IEEE_P (TFmode))
-    switch (icode)
-      {
-      case CODE_FOR_sqrtkf2_odd:
-	icode = CODE_FOR_sqrttf2_odd;
-	break;
-      case CODE_FOR_trunckfdf2_odd:
-	icode = CODE_FOR_trunctfdf2_odd;
-	break;
-      case CODE_FOR_addkf3_odd:
-	icode = CODE_FOR_addtf3_odd;
-	break;
-      case CODE_FOR_subkf3_odd:
-	icode = CODE_FOR_subtf3_odd;
-	break;
-      case CODE_FOR_mulkf3_odd:
-	icode = CODE_FOR_multf3_odd;
-	break;
-      case CODE_FOR_divkf3_odd:
-	icode = CODE_FOR_divtf3_odd;
-	break;
-      case CODE_FOR_fmakf4_odd:
-	icode = CODE_FOR_fmatf4_odd;
-	break;
-      case CODE_FOR_xsxexpqp_kf:
-	icode = CODE_FOR_xsxexpqp_tf;
-	break;
-      case CODE_FOR_xsxsigqp_kf:
-	icode = CODE_FOR_xsxsigqp_tf;
-	break;
-      case CODE_FOR_xststdcnegqp_kf:
-	icode = CODE_FOR_xststdcnegqp_tf;
-	break;
-      case CODE_FOR_xsiexpqp_kf:
-	icode = CODE_FOR_xsiexpqp_tf;
-	break;
-      case CODE_FOR_xsiexpqpf_kf:
-	icode = CODE_FOR_xsiexpqpf_tf;
-	break;
-      case CODE_FOR_xststdcqp_kf:
-	icode = CODE_FOR_xststdcqp_tf;
-	break;
-      case CODE_FOR_xscmpexpqp_eq_kf:
-	icode = CODE_FOR_xscmpexpqp_eq_tf;
-	break;
-      case CODE_FOR_xscmpexpqp_lt_kf:
-	icode = CODE_FOR_xscmpexpqp_lt_tf;
-	break;
-      case CODE_FOR_xscmpexpqp_gt_kf:
-	icode = CODE_FOR_xscmpexpqp_gt_tf;
-	break;
-      case CODE_FOR_xscmpexpqp_unordered_kf:
-	icode = CODE_FOR_xscmpexpqp_unordered_tf;
-	break;
-      default:
-	break;
-      }
-
   /* In case of "#pragma target" changes, we initialize all builtins
      but check for actual availability now, during expand time.  For
      invalid builtins, generate a normal call.  */
@@ -3524,22 +3441,6 @@ rs6000_expand_builtin (tree exp, rtx target, rtx /* subtarget */,
 	gcc_unreachable ();
     }
 
-  if (bif_is_ibm128 (*bifaddr) && TARGET_LONG_DOUBLE_128 && !TARGET_IEEEQUAD)
-    {
-      if (fcode == RS6000_BIF_PACK_IF)
-	{
-	  icode = CODE_FOR_packtf;
-	  fcode = RS6000_BIF_PACK_TF;
-	  uns_fcode = (size_t) fcode;
-	}
-      else if (fcode == RS6000_BIF_UNPACK_IF)
-	{
-	  icode = CODE_FOR_unpacktf;
-	  fcode = RS6000_BIF_UNPACK_TF;
-	  uns_fcode = (size_t) fcode;
-	}
-    }
-
   /* TRUE iff the built-in function returns void.  */
   bool void_func = TREE_TYPE (TREE_TYPE (fndecl)) == void_type_node;
   /* Position of first argument (0 for void-returning functions, else 1).  */
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index 94f84e26f7a..0099c8b95ab 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -11064,32 +11064,6 @@ init_float128_ieee (machine_mode mode)
 {
   if (FLOAT128_VECTOR_P (mode))
     {
-      static bool complex_muldiv_init_p = false;
-
-      /* Set up to call __mulkc3 and __divkc3 under -mabi=ieeelongdouble.  If
-	 we have clone or target attributes, this will be called a second
-	 time.  We want to create the built-in function only once.  */
-     if (mode == TFmode && TARGET_IEEEQUAD && !complex_muldiv_init_p)
-       {
-	 complex_muldiv_init_p = true;
-	 built_in_function fncode_mul =
-	   (built_in_function) (BUILT_IN_COMPLEX_MUL_MIN + TCmode
-				- MIN_MODE_COMPLEX_FLOAT);
-	 built_in_function fncode_div =
-	   (built_in_function) (BUILT_IN_COMPLEX_DIV_MIN + TCmode
-				- MIN_MODE_COMPLEX_FLOAT);
-
-	 tree fntype = build_function_type_list (complex_long_double_type_node,
-						 long_double_type_node,
-						 long_double_type_node,
-						 long_double_type_node,
-						 long_double_type_node,
-						 NULL_TREE);
-
-	 create_complex_muldiv ("__mulkc3", fncode_mul, fntype);
-	 create_complex_muldiv ("__divkc3", fncode_div, fntype);
-       }
-
       set_optab_libfunc (add_optab, mode, "__addkf3");
       set_optab_libfunc (sub_optab, mode, "__subkf3");
       set_optab_libfunc (neg_optab, mode, "__negkf2");
@@ -11195,6 +11169,46 @@ rs6000_init_libfuncs (void)
       else
 	init_float128_ieee (TFmode);
     }
+
+  /* Set up to call __mulkc3 and __divkc3 when long double uses the IEEE
+     128-bit encoding.  We cannot use the same name (__mulkc3 or __divkc3 for
+     both IEEE long double and for explicit _Float128/__float128) because
+     c_builtin_function will complain if we create two built-in functions with
+     the same name.  Instead we use an alias name for the case when long double
+     uses the IEEE 128-bit encoding.  Libgcc will create a weak alias reference
+     for this name.
+
+     We need to only execute this once.  If we have clone or target attributes,
+     this will be called a second time.  We need to create the built-in
+     function only once.  */
+  static bool complex_muldiv_init_p = false;
+
+  if (TARGET_FLOAT128_TYPE && TARGET_IEEEQUAD && TARGET_LONG_DOUBLE_128
+      && !complex_muldiv_init_p)
+    {
+      complex_muldiv_init_p = true;
+
+      tree fntype = build_function_type_list (complex_long_double_type_node,
+					      long_double_type_node,
+					      long_double_type_node,
+					      long_double_type_node,
+					      long_double_type_node,
+					      NULL_TREE);
+
+      /* Create complex multiply.  */
+      built_in_function mul_fncode =
+	(built_in_function) (BUILT_IN_COMPLEX_MUL_MIN + TCmode
+			     - MIN_MODE_COMPLEX_FLOAT);
+
+      create_complex_muldiv ("__multc3_ieee128", mul_fncode, fntype);
+
+      /* Create complex divide.  */
+      built_in_function div_fncode =
+	(built_in_function) (BUILT_IN_COMPLEX_DIV_MIN + TCmode
+			     - MIN_MODE_COMPLEX_FLOAT);
+
+      create_complex_muldiv ("__divtc3_ieee128", div_fncode, fntype);
+    }
 }
 
 /* Emit a potentially record-form instruction, setting DST from SRC.
@@ -23837,13 +23851,9 @@ rs6000_libgcc_floating_mode_supported_p (scalar_float_mode mode)
     case E_TFmode:
       return true;
 
-      /* We only return true for KFmode if IEEE 128-bit types are supported, and
-	 if long double does not use the IEEE 128-bit format.  If long double
-	 uses the IEEE 128-bit format, it will use TFmode and not KFmode.
-	 Because the code will not use KFmode in that case, there will be aborts
-	 because it can't find KFmode in the Floatn types.  */
+      /* We only return true for KFmode if IEEE 128-bit types are supported.  */
     case E_KFmode:
-      return TARGET_FLOAT128_TYPE && !TARGET_IEEEQUAD;
+      return TARGET_FLOAT128_TYPE;
 
     default:
       return false;
@@ -23877,7 +23887,7 @@ rs6000_floatn_mode (int n, bool extended)
 
 	case 64:
 	  if (TARGET_FLOAT128_TYPE)
-	    return (FLOAT128_IEEE_P (TFmode)) ? TFmode : KFmode;
+	    return KFmode;
 	  else
 	    return opt_scalar_float_mode ();
 
@@ -23901,7 +23911,7 @@ rs6000_floatn_mode (int n, bool extended)
 
 	case 128:
 	  if (TARGET_FLOAT128_TYPE)
-	    return (FLOAT128_IEEE_P (TFmode)) ? TFmode : KFmode;
+	    return KFmode;
 	  else
 	    return opt_scalar_float_mode ();
 
@@ -23919,7 +23929,7 @@ rs6000_c_mode_for_suffix (char suffix)
   if (TARGET_FLOAT128_TYPE)
     {
       if (suffix == 'q' || suffix == 'Q')
-	return (FLOAT128_IEEE_P (TFmode)) ? TFmode : KFmode;
+	return KFmode;
 
       /* At the moment, we are not defining a suffix for IBM extended double.
 	 If/when the default for -mabi=ieeelongdouble is changed, and we want
diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index f942597c3b4..e17252bb8de 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -543,12 +543,6 @@
 ; Iterator for 128-bit VSX types for pack/unpack
 (define_mode_iterator FMOVE128_VSX [V1TI KF])
 
-; Iterators for converting to/from TFmode
-(define_mode_iterator IFKF [IF KF])
-
-; Constraints for moving IF/KFmode.
-(define_mode_attr IFKF_reg [(IF "d") (KF "wa")])
-
 ; Whether a floating point move is ok, don't allow SD without hardware FP
 (define_mode_attr fmove_ok [(SF "")
 			    (DF "")
@@ -9075,6 +9069,15 @@
   DONE;
 })
 
+(define_expand "extendkfif2"
+  [(set (match_operand:IF 0 "gpc_reg_operand")
+	(float_extend:IF (match_operand:KF 1 "gpc_reg_operand")))]
+  "TARGET_FLOAT128_TYPE"
+{
+  rs6000_expand_float128_convert (operands[0], operands[1], false);
+  DONE;
+})
+
 (define_expand "extendtfkf2"
   [(set (match_operand:KF 0 "gpc_reg_operand")
 	(float_extend:KF (match_operand:TF 1 "gpc_reg_operand")))]
@@ -9111,6 +9114,15 @@
   DONE;
 })
 
+(define_expand "trunckfif2"
+  [(set (match_operand:IF 0 "gpc_reg_operand")
+	(float_truncate:IF (match_operand:KF 1 "gpc_reg_operand")))]
+  "TARGET_FLOAT128_TYPE"
+{
+  rs6000_expand_float128_convert (operands[0], operands[1], false);
+  DONE;
+})
+
 (define_expand "trunckftf2"
   [(set (match_operand:TF 0 "gpc_reg_operand")
 	(float_truncate:TF (match_operand:KF 1 "gpc_reg_operand")))]
@@ -9129,31 +9141,73 @@
   DONE;
 })
 
-(define_insn_and_split "*extend<mode>tf2_internal"
-  [(set (match_operand:TF 0 "gpc_reg_operand" "=<IFKF_reg>")
+;; Convert between KFmode and TFmode when -mabi=ieeelongdouble
+(define_insn_and_split "*extendkftf2_internal"
+  [(set (match_operand:TF 0 "gpc_reg_operand" "=wa,wa")
 	(float_extend:TF
-	 (match_operand:IFKF 1 "gpc_reg_operand" "<IFKF_reg>")))]
-   "TARGET_FLOAT128_TYPE
-    && FLOAT128_IBM_P (TFmode) == FLOAT128_IBM_P (<MODE>mode)"
+	 (match_operand:KF 1 "gpc_reg_operand" "0,wa")))]
+   "FLOAT128_IEEE_P (TFmode)"
   "#"
   "&& reload_completed"
   [(set (match_dup 0) (match_dup 2))]
 {
   operands[2] = gen_rtx_REG (TFmode, REGNO (operands[1]));
-})
+}
+  [(set_attr "type" "vecsimple")])
 
-(define_insn_and_split "*extendtf<mode>2_internal"
-  [(set (match_operand:IFKF 0 "gpc_reg_operand" "=<IFKF_reg>")
-	(float_extend:IFKF
-	 (match_operand:TF 1 "gpc_reg_operand" "<IFKF_reg>")))]
-   "TARGET_FLOAT128_TYPE
-    && FLOAT128_IBM_P (TFmode) == FLOAT128_IBM_P (<MODE>mode)"
+(define_insn_and_split "*extendtfkf2_internal"
+  [(set (match_operand:KF 0 "gpc_reg_operand" "=wa,wa")
+	(float_extend:KF
+	 (match_operand:TF 1 "gpc_reg_operand" "0,wa")))]
+   "FLOAT128_IEEE_P (TFmode)"
   "#"
   "&& reload_completed"
   [(set (match_dup 0) (match_dup 2))]
 {
-  operands[2] = gen_rtx_REG (<MODE>mode, REGNO (operands[1]));
-})
+  operands[2] = gen_rtx_REG (KFmode, REGNO (operands[1]));
+}
+  [(set_attr "type" "vecsimple")])
+
+;; Convert between IFmode and TFmode when -mabi=ibmlongdouble
+(define_insn_and_split "*extendiftf2_internal"
+  [(set (match_operand:TF 0 "gpc_reg_operand" "=d,&d")
+	(float_extend:TF
+	 (match_operand:IF 1 "input_operand" "0,d")))]
+   "FLOAT128_IBM_P (TFmode)"
+  "#"
+  "&& reload_completed"
+  [(set (match_dup 2) (match_dup 3))
+   (set (match_dup 4) (match_dup 5))]
+{
+  unsigned int op0_regno = reg_or_subregno (operands[0]);
+  unsigned int op1_regno = reg_or_subregno (operands[1]); 
+  operands[2] = gen_rtx_REG (DFmode, op0_regno);
+  operands[3] = gen_rtx_REG (DFmode, op1_regno);
+  operands[4] = gen_rtx_REG (DFmode, op0_regno + 1);
+  operands[5] = gen_rtx_REG (DFmode, op1_regno + 1);
+}
+  [(set_attr "type" "two")
+   (set_attr "num_insns" "2")])
+
+(define_insn_and_split "*extendtfif2_internal"
+  [(set (match_operand:IF 0 "gpc_reg_operand" "=d,&d")
+	(float_extend:IF
+	 (match_operand:TF 1 "input_operand" "0,d")))]
+   "FLOAT128_IBM_P (TFmode)"
+  "#"
+  "&& reload_completed"
+  [(set (match_dup 2) (match_dup 3))
+   (set (match_dup 4) (match_dup 5))]
+{
+  unsigned int op0_regno = reg_or_subregno (operands[0]);
+  unsigned int op1_regno = reg_or_subregno (operands[1]); 
+  operands[2] = gen_rtx_REG (DFmode, op0_regno);
+  operands[3] = gen_rtx_REG (DFmode, op1_regno);
+  operands[4] = gen_rtx_REG (DFmode, op0_regno + 1);
+  operands[5] = gen_rtx_REG (DFmode, op1_regno + 1);
+}
+  [(set_attr "type" "two")
+   (set_attr "num_insns" "2")])
 
 \f
 ;; Reload helper functions used by rs6000_secondary_reload.  The patterns all
diff --git a/gcc/testsuite/gcc.target/powerpc/divkc3-2.c b/gcc/testsuite/gcc.target/powerpc/divkc3-2.c
index e34ed40bac2..0cfcea837ed 100644
--- a/gcc/testsuite/gcc.target/powerpc/divkc3-2.c
+++ b/gcc/testsuite/gcc.target/powerpc/divkc3-2.c
@@ -14,4 +14,4 @@ divide (cld_t *p, cld_t *q, cld_t *r)
   *p = *q / *r;
 }
 
-/* { dg-final { scan-assembler "bl __divkc3" } } */
+/* { dg-final { scan-assembler "bl __divtc3_ieee128" } } */
diff --git a/gcc/testsuite/gcc.target/powerpc/mulkc3-2.c b/gcc/testsuite/gcc.target/powerpc/mulkc3-2.c
index eee6de9e2a5..78ef1dc00f0 100644
--- a/gcc/testsuite/gcc.target/powerpc/mulkc3-2.c
+++ b/gcc/testsuite/gcc.target/powerpc/mulkc3-2.c
@@ -14,4 +14,4 @@ multiply (cld_t *p, cld_t *q, cld_t *r)
   *p = *q * *r;
 }
 
-/* { dg-final { scan-assembler "bl __mulkc3" } } */
+/* { dg-final { scan-assembler "bl __multc3_ieee128" } } */
diff --git a/libgcc/config/rs6000/float128-ifunc.c b/libgcc/config/rs6000/float128-ifunc.c
index 73cbca2fc9a..30d46bcb233 100644
--- a/libgcc/config/rs6000/float128-ifunc.c
+++ b/libgcc/config/rs6000/float128-ifunc.c
@@ -359,3 +359,9 @@ TCtype __mulkc3 (TFtype, TFtype, TFtype, TFtype)
 
 TCtype __divkc3 (TFtype, TFtype, TFtype, TFtype)
   __attribute__ ((__ifunc__ ("__divkc3_resolve")));
+
+TCtype __multc3_ieee128 (TFtype, TFtype, TFtype, TFtype)
+  __attribute__ ((__ifunc__ ("__mulkc3_resolve")));
+
+TCtype __divtc3_ieee128 (TFtype, TFtype, TFtype, TFtype)
+  __attribute__ ((__ifunc__ ("__divkc3_resolve")));
diff --git a/libgcc/config/rs6000/quad-float128.h b/libgcc/config/rs6000/quad-float128.h
index ae0622c744c..a684d0e1bcf 100644
--- a/libgcc/config/rs6000/quad-float128.h
+++ b/libgcc/config/rs6000/quad-float128.h
@@ -191,6 +191,11 @@ extern TFtype __trunctfkf2 (IBM128_TYPE);
 extern TCtype __mulkc3 (TFtype, TFtype, TFtype, TFtype);
 extern TCtype __divkc3 (TFtype, TFtype, TFtype, TFtype);
 
+/* Complex long double multiply/divide if long double uses the IEEE 128-bit
+   encoding.  */
+extern TCtype __multc3_ieee128 (TFtype, TFtype, TFtype, TFtype);
+extern TCtype __divtc3_ieee128 (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.  */