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* [PATCH ver 6] rs6000: Add builtins for IEEE 128-bit floating point values
@ 2023-06-19 18:54 Carl Love
  2023-06-20  3:03 ` Kewen.Lin
  0 siblings, 1 reply; 2+ messages in thread
From: Carl Love @ 2023-06-19 18:54 UTC (permalink / raw)
  To: Kewen.Lin, dje.gcc, gcc-patches, Segher Boessenkool; +Cc: Peter Bergner, cel


Kewen, GCC maintainers:

Version 6, Fixed missing change log entry.  Changed builtin id names as
requested.  Missed making the change on the last version.  Fixed
comment in the three test cases.  Reran regression suite on Power 10,
no regressions.

Version 5, Tested the patch on P9 BE per request.  Fixed up test case
to get the correct expected values for BE and LE.  Fixed typos. 
Updated the doc/extend.texi to clarify the vector arguments.  Changed
test file names per request.  Moved builtin defs next to related
definitions.  Renamed new mode_attr. Removed new mode_iterator, used
existing iterator instead. Renamed mode_iterator VSEEQP_DI to V2DI_DI. 
Fixed up overloaded definitions per request.

Version 4, added missing cases for new xxexpqp, xsxexpdp and xsxsigqp
cases to rs6000_expand_builtin.  Merged the new define_insn definitions
with the existing definitions.  Renamed the builtins by removing the
__builtin_ prefix from the names.  Fixed the documentation for the
builtins.  Updated the test files to check the desired instructions
were generated.  Retested patch on Power 10 with no regressions.

Version 3, was able to get the overloaded version of scalar_insert_exp
to work and the change to xsxexpqp_f128_<mode> define instruction to
work with the suggestions from Kewen.  

Version 2, I have addressed the various comments from Kewen.  I had
issues with adding an additional overloaded version of
scalar_insert_exp with vector arguments.  The overload infrastructure
didn't work with a mix of scalar and vector arguments.  I did rename
the __builtin_insertf128_exp to __builtin_vsx_scalar_insert_exp_qp make
it similar to the existing builtin.  I also wasn't able to get the
suggested merge of xsxexpqp_f128_<mode> with xsxexpqp_<mode> to work so
I left the two simpler definitiions.

The patch add three new builtins to extract the significand and
exponent of an IEEE float 128-bit value where the builtin argument is a
vector.  Additionally, a builtin to insert the exponent into an IEEE
float 128-bit vector argument is added.  These builtins were requested
since there is no clean and optimal way to transfer between a vector
and a scalar IEEE 128 bit value.

The patch has been tested on Power 9 BE and Power 10 LE with no
regressions.  Please let me know if the patch is acceptable or not. 
Thanks.

               Carl

--------------------------------------------
rs6000: Add builtins for IEEE 128-bit floating point values

Add support for the following builtins:

 __vector unsigned long long int scalar_extract_exp_to_vec (__ieee128);
 __vector unsigned __int128 scalar_extract_sig_to_vec (__ieee128);
 __ieee128 scalar_insert_exp (__vector unsigned __int128,
 			      __vector unsigned long long);

The instructions used in the builtins operate on vector registers.  Thus
the result must be moved to a scalar type.  There is no clean, performant
way to do this.  The user code typically needs the result as a vector
anyway.

gcc/
	* config/rs6000/rs6000-builtin.cc (rs6000_expand_builtin):
	Rename CCDE_FOR_xsxexpqp_tf to CODE_FOR_xsxexpqp_tf_di.
	Rename CODE_FOR_xsxexpqp_kf to CODE_FOR_xsxexpqp_kf_di.
	(CODE_FOR_xsxexpqp_kf_v2di, CODE_FOR_xsxsigqp_kf_v1ti,
	CODE_FOR_xsiexpqp_kf_v2di): Add case statements.
	* config/rs6000/rs6000-buildin.def (__builtin_extractf128_exp,
	 __builtin_extractf128_sig, __builtin_insertf128_exp): Add new
	builtin definitions.
	Rename xsxexpqp_kf, xsxsigqp_kf, xsiexpqp_kf to xsexpqp_kf_di,
	xsxsigqp_kf_ti, xsiexpqp_kf_di respectively.
	* config/rs6000/rs6000-c.cc (altivec_resolve_overloaded_builtin):
	Update case RS6000_OVLD_VEC_VSIE to handle MODE_VECTOR_INT for new
	overloaded instance. Update comments.
	* config/rs6000/rs6000-overload.def
	(__builtin_vec_scalar_insert_exp): Add new overload definition with
	vector arguments.
	(scalar_extract_exp_to_vec, scalar_extract_sig_to_vec): New
	overloaded definitions.
	* config/vsx.md (V2DI_DI): New mode iterator.
	(DI_to_TI): New mode attribute.
	Rename xsxexpqp_<mode> to sxexpqp_<IEEE128:mode>_<V2DI_DI:mode>.
	Rename xsxsigqp_<mode> to xsxsigqp_<IEEE128:mode>_<VEC_TI:mode>.
	Rename xsiexpqp_<mode> to xsiexpqp_<IEEE128:mode>_<V2DI_DI:mode>.
	* doc/extend.texi (__builtin_extractf128_exp,
	__builtin_extractf128_sig): Add documentation for new builtins.
	(scalar_insert_exp): Add new overloaded builtin definition.

gcc/testsuite/
	* gcc.target/powerpc/bfp/extract-exp-8.c: New test case.
	* gcc.target/powerpc/bfp/extract-sig-8.c: New test case.
	* gcc.target/powerpc/bfp/insert-exp-16.c: New test case.
---
 gcc/config/rs6000/rs6000-builtin.cc           |  21 +++-
 gcc/config/rs6000/rs6000-builtins.def         |  15 ++-
 gcc/config/rs6000/rs6000-c.cc                 |  10 +-
 gcc/config/rs6000/rs6000-overload.def         |  12 ++
 gcc/config/rs6000/vsx.md                      |  25 +++--
 gcc/doc/extend.texi                           |  24 +++-
 .../powerpc/bfp/scalar-extract-exp-8.c        |  58 ++++++++++
 .../powerpc/bfp/scalar-extract-sig-8.c        |  65 +++++++++++
 .../powerpc/bfp/scalar-insert-exp-16.c        | 103 ++++++++++++++++++
 9 files changed, 307 insertions(+), 26 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/powerpc/bfp/scalar-extract-exp-8.c
 create mode 100644 gcc/testsuite/gcc.target/powerpc/bfp/scalar-extract-sig-8.c
 create mode 100644 gcc/testsuite/gcc.target/powerpc/bfp/scalar-insert-exp-16.c

diff --git a/gcc/config/rs6000/rs6000-builtin.cc b/gcc/config/rs6000/rs6000-builtin.cc
index 534698e7d3e..a8f291c6a72 100644
--- a/gcc/config/rs6000/rs6000-builtin.cc
+++ b/gcc/config/rs6000/rs6000-builtin.cc
@@ -3326,17 +3326,26 @@ rs6000_expand_builtin (tree exp, rtx target, rtx /* subtarget */,
       case CODE_FOR_fmakf4_odd:
 	icode = CODE_FOR_fmatf4_odd;
 	break;
-      case CODE_FOR_xsxexpqp_kf:
-	icode = CODE_FOR_xsxexpqp_tf;
+      case CODE_FOR_xsxexpqp_kf_di:
+	icode = CODE_FOR_xsxexpqp_tf_di;
 	break;
-      case CODE_FOR_xsxsigqp_kf:
-	icode = CODE_FOR_xsxsigqp_tf;
+      case CODE_FOR_xsxexpqp_kf_v2di:
+	icode = CODE_FOR_xsxexpqp_tf_v2di;
+	break;
+      case CODE_FOR_xsxsigqp_kf_ti:
+	icode = CODE_FOR_xsxsigqp_tf_ti;
+	break;
+      case CODE_FOR_xsxsigqp_kf_v1ti:
+	icode = CODE_FOR_xsxsigqp_tf_v1ti;
 	break;
       case CODE_FOR_xststdcnegqp_kf:
 	icode = CODE_FOR_xststdcnegqp_tf;
 	break;
-      case CODE_FOR_xsiexpqp_kf:
-	icode = CODE_FOR_xsiexpqp_tf;
+      case CODE_FOR_xsiexpqp_kf_di:
+	icode = CODE_FOR_xsiexpqp_tf_di;
+	break;
+      case CODE_FOR_xsiexpqp_kf_v2di:
+	icode = CODE_FOR_xsiexpqp_tf_v2di;
 	break;
       case CODE_FOR_xsiexpqpf_kf:
 	icode = CODE_FOR_xsiexpqpf_tf;
diff --git a/gcc/config/rs6000/rs6000-builtins.def b/gcc/config/rs6000/rs6000-builtins.def
index 638d0bc72ca..da0ddfa127c 100644
--- a/gcc/config/rs6000/rs6000-builtins.def
+++ b/gcc/config/rs6000/rs6000-builtins.def
@@ -2902,19 +2902,28 @@
     TRUNCF128_ODD trunckfdf2_odd {}
 
   const signed long long __builtin_vsx_scalar_extract_expq (_Float128);
-    VSEEQP xsxexpqp_kf {}
+    VSEEQP xsxexpqp_kf_di {}
+
+  vull __builtin_vsx_scalar_extract_exp_to_vec (_Float128);
+    VSEEQPV xsxexpqp_kf_v2di {}
 
   const signed __int128 __builtin_vsx_scalar_extract_sigq (_Float128);
-    VSESQP xsxsigqp_kf {}
+    VSESQP xsxsigqp_kf_ti {}
+
+  vuq __builtin_vsx_scalar_extract_sig_to_vec (_Float128);
+    VSESQPV xsxsigqp_kf_v1ti {}
 
   const _Float128 __builtin_vsx_scalar_insert_exp_q (unsigned __int128, \
                                                      unsigned long long);
-    VSIEQP xsiexpqp_kf {}
+    VSIEQP xsiexpqp_kf_di {}
 
   const _Float128 __builtin_vsx_scalar_insert_exp_qp (_Float128, \
                                                       unsigned long long);
     VSIEQPF xsiexpqpf_kf {}
 
+  const _Float128 __builtin_vsx_scalar_insert_exp_vqp (vuq, vull);
+    VSIEQPV xsiexpqp_kf_v2di {}
+
   const signed int __builtin_vsx_scalar_test_data_class_qp (_Float128, \
                                                             const int<7>);
     VSTDCQP xststdcqp_kf {}
diff --git a/gcc/config/rs6000/rs6000-c.cc b/gcc/config/rs6000/rs6000-c.cc
index 8555174d36e..11060f697db 100644
--- a/gcc/config/rs6000/rs6000-c.cc
+++ b/gcc/config/rs6000/rs6000-c.cc
@@ -1929,11 +1929,15 @@ altivec_resolve_overloaded_builtin (location_t loc, tree fndecl,
 	   128-bit variant of built-in function.  */
 	if (GET_MODE_PRECISION (arg1_mode) > 64)
 	  {
-	    /* If first argument is of float variety, choose variant
-	       that expects __ieee128 argument.  Otherwise, expect
-	       __int128 argument.  */
+	    /* If first argument is of float variety, choose the variant that
+	       expects __ieee128 argument.  If the first argument is vector
+	       int, choose the variant that expects vector unsigned
+	       __int128 argument.  Otherwise, expect scalar __int128 argument.
+	    */
 	    if (GET_MODE_CLASS (arg1_mode) == MODE_FLOAT)
 	      instance_code = RS6000_BIF_VSIEQPF;
+	    else if (GET_MODE_CLASS (arg1_mode) == MODE_VECTOR_INT)
+	      instance_code = RS6000_BIF_VSIEQPV;
 	    else
 	      instance_code = RS6000_BIF_VSIEQP;
 	  }
diff --git a/gcc/config/rs6000/rs6000-overload.def b/gcc/config/rs6000/rs6000-overload.def
index c582490c084..470d718efde 100644
--- a/gcc/config/rs6000/rs6000-overload.def
+++ b/gcc/config/rs6000/rs6000-overload.def
@@ -4515,6 +4515,18 @@
     VSIEQP
   _Float128 __builtin_vec_scalar_insert_exp (_Float128, unsigned long long);
     VSIEQPF
+  _Float128 __builtin_vec_scalar_insert_exp (vuq, vull);
+    VSIEQPV
+
+[VEC_VSEEV, scalar_extract_exp_to_vec, \
+            __builtin_vec_scalar_extract_exp_to_vector]
+  vull __builtin_vec_scalar_extract_exp_to_vector (_Float128);
+    VSEEQPV
+
+[VEC_VSESV, scalar_extract_sig_to_vec, \
+            __builtin_vec_scalar_extract_sig_to_vector]
+  vuq __builtin_vec_scalar_extract_sig_to_vector (_Float128);
+    VSESQPV
 
 [VEC_VSTDC, scalar_test_data_class, __builtin_vec_scalar_test_data_class]
   unsigned int __builtin_vec_scalar_test_data_class (float, const int);
diff --git a/gcc/config/rs6000/vsx.md b/gcc/config/rs6000/vsx.md
index 7d845df5c2d..86cb98a2c61 100644
--- a/gcc/config/rs6000/vsx.md
+++ b/gcc/config/rs6000/vsx.md
@@ -396,6 +396,9 @@
 			   V4SF
 			   V2DF
 			   V2DI])
+(define_mode_iterator V2DI_DI  [V2DI DI])
+(define_mode_attr DI_to_TI [(V2DI "V1TI")
+			    (DI   "TI")])
 
 (define_mode_attr VM3_char [(V2DI "d")
 			   (V4SI "w")
@@ -5008,9 +5011,10 @@
 ;; ISA 3.0 Binary Floating-Point Support
 
 ;; VSX Scalar Extract Exponent Quad-Precision
-(define_insn "xsxexpqp_<mode>"
-  [(set (match_operand:DI 0 "altivec_register_operand" "=v")
-	(unspec:DI [(match_operand:IEEE128 1 "altivec_register_operand" "v")]
+(define_insn "xsxexpqp_<IEEE128:mode>_<V2DI_DI:mode>"
+  [(set (match_operand:V2DI_DI 0 "altivec_register_operand" "=v")
+	(unspec:V2DI_DI
+	  [(match_operand:IEEE128 1 "altivec_register_operand" "v")]
 	 UNSPEC_VSX_SXEXPDP))]
   "TARGET_P9_VECTOR"
   "xsxexpqp %0,%1"
@@ -5026,9 +5030,10 @@
   [(set_attr "type" "integer")])
 
 ;; VSX Scalar Extract Significand Quad-Precision
-(define_insn "xsxsigqp_<mode>"
-  [(set (match_operand:TI 0 "altivec_register_operand" "=v")
-	(unspec:TI [(match_operand:IEEE128 1 "altivec_register_operand" "v")]
+(define_insn "xsxsigqp_<IEEE128:mode>_<VEC_TI:mode>"
+  [(set (match_operand:VEC_TI 0 "altivec_register_operand" "=v")
+	(unspec:VEC_TI [(match_operand:IEEE128 1
+			    "altivec_register_operand" "v")]
 	 UNSPEC_VSX_SXSIG))]
   "TARGET_P9_VECTOR"
   "xsxsigqp %0,%1"
@@ -5055,10 +5060,12 @@
   [(set_attr "type" "vecmove")])
 
 ;; VSX Scalar Insert Exponent Quad-Precision
-(define_insn "xsiexpqp_<mode>"
+(define_insn "xsiexpqp_<IEEE128:mode>_<V2DI_DI:mode>"
   [(set (match_operand:IEEE128 0 "altivec_register_operand" "=v")
-	(unspec:IEEE128 [(match_operand:TI 1 "altivec_register_operand" "v")
-			 (match_operand:DI 2 "altivec_register_operand" "v")]
+	(unspec:IEEE128 [(match_operand:<DI_to_TI> 1
+			  "altivec_register_operand" "v")
+			 (match_operand:V2DI_DI 2
+			  "altivec_register_operand" "v")]
 	 UNSPEC_VSX_SIEXPQP))]
   "TARGET_P9_VECTOR"
   "xsiexpqp %0,%1,%2"
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index e426a2eb7d8..e90fdbd098b 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -19724,6 +19724,10 @@ double scalar_insert_exp (double significand, unsigned long long int exponent);
 ieee_128 scalar_insert_exp (unsigned __int128 significand,
                             unsigned long long int exponent);
 ieee_128 scalar_insert_exp (ieee_128 significand, unsigned long long int exponent);
+vector ieee_128 scalar_insert_exp (vector unsigned __int128 significand,
+                                   vector unsigned long long exponent);
+vector unsigned long long scalar_extract_exp_to_vec (ieee_128);
+vector unsigned __int128  scalar_extract_sig_to_vec (ieee_128);
 
 int scalar_cmp_exp_gt (double arg1, double arg2);
 int scalar_cmp_exp_lt (double arg1, double arg2);
@@ -19771,11 +19775,21 @@ of the result are composed of the least significant 11 bits of the
 
 When supplied with a 128-bit first argument, the
 @code{scalar_insert_exp} built-in function returns a quad-precision
-ieee floating point value.  The sign bit of the result is copied from
-the most significant bit of the @code{significand} argument.
-The significand and exponent components of the result are composed of
-the least significant 15 bits of the @code{exponent} argument and the
-least significant 112 bits of the @code{significand} argument respectively.
+IEEE floating point value if the two arguments were scalar.  If the two
+arguments are vectors, the return value is a vector IEEE floating point value.
+The sign bit of the result is copied from the most significant bit of the
+@code{significand} argument.  The significand and exponent components of the
+result are composed of the least significant 15 bits of the @code{exponent}
+argument (element 0 on big-endian and element 1 on little-endian) and the
+least significant 112 bits of the @code{significand} argument
+respectively.  Note, the @code{significand} is the scalar argument or in the
+case of vector arguments, @code{significand} is element 0 for big-endian and
+element 1 for little-endian.
+
+The @code{scalar_extract_exp_to_vec},
+and @code{scalar_extract_sig_to_vec} are similar to
+@code{scalar_extract_exp}, @code{scalar_extract_sig} except they return
+a vector result of type unsigned long long and unsigned __int128 respectively.
 
 The @code{scalar_cmp_exp_gt}, @code{scalar_cmp_exp_lt},
 @code{scalar_cmp_exp_eq}, and @code{scalar_cmp_exp_unordered} built-in
diff --git a/gcc/testsuite/gcc.target/powerpc/bfp/scalar-extract-exp-8.c b/gcc/testsuite/gcc.target/powerpc/bfp/scalar-extract-exp-8.c
new file mode 100644
index 00000000000..eedcfcdac96
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/bfp/scalar-extract-exp-8.c
@@ -0,0 +1,58 @@
+/* { dg-do run { target { powerpc*-*-* } } } */
+/* { dg-require-effective-target lp64 } */
+/* { dg-require-effective-target p9vector_hw } */
+/* { dg-options "-mdejagnu-cpu=power9 -save-temps" } */
+
+#include <altivec.h>
+#include <stdlib.h>
+
+#if DEBUG
+#include <stdio.h>
+#endif
+
+vector unsigned long long int
+get_exponents (__ieee128 *p)
+{
+  __ieee128 source = *p;
+
+  return scalar_extract_exp_to_vec (source);
+}
+
+int
+main ()
+{
+  vector unsigned long long int result, exp_result;
+  union conv128_t
+   {
+     __ieee128 val_ieee128;
+     __int128  val_int128;
+  } source;
+  
+#ifdef _BIG_ENDIAN
+  exp_result[1] = 0x0ULL;
+  exp_result[0] = 0x1234ULL;
+#else
+  exp_result[0] = 0x0ULL;
+  exp_result[1] = 0x1234ULL;
+#endif
+  source.val_int128 = 0x923456789ABCDEF0ULL;
+  source.val_int128 = (source.val_int128 << 64) | 0x123456789ABCDEFULL;
+
+  result = get_exponents (&source.val_ieee128);
+
+  if ((result[0] != exp_result[0]) || (result[1] != exp_result[1]))
+#if DEBUG
+    {
+      printf("result[0] = 0x%llx; exp_result[0] = 0x%llx\n",
+	     result[0], exp_result[0]);
+      printf("result[1] = 0x%llx; exp_result[1] = 0x%llx\n",
+	     result[1], exp_result[1]);
+    }
+#else
+    abort();
+#endif
+  return 0;
+}
+
+/* Check that the expected extract exponent instruction is generated. */
+/* { dg-final { scan-assembler-times {\mxsxexpqp\M} 1 } } */
diff --git a/gcc/testsuite/gcc.target/powerpc/bfp/scalar-extract-sig-8.c b/gcc/testsuite/gcc.target/powerpc/bfp/scalar-extract-sig-8.c
new file mode 100644
index 00000000000..69a908a53c2
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/bfp/scalar-extract-sig-8.c
@@ -0,0 +1,65 @@
+/* { dg-do run { target { powerpc*-*-* } } } */
+/* { dg-require-effective-target lp64 } */
+/* { dg-require-effective-target p9vector_hw } */
+/* { dg-options "-mdejagnu-cpu=power9 -save-temps" } */
+
+#include <altivec.h>
+#include <stdlib.h>
+
+#if DEBUG
+#include <stdio.h>
+#endif
+
+vector unsigned __int128
+get_significand (__ieee128 *p)
+{
+  __ieee128 source = *p;
+
+  return scalar_extract_sig_to_vec(source);
+}
+
+int
+main ()
+{
+  #define NOT_ZERO_OR_DENORMAL  0x1000000000000
+
+  union conv128_t
+   {
+     __ieee128 val_ieee128;
+     unsigned long long int val_ull[2];
+     unsigned __int128  val_uint128;
+     vector unsigned __int128  val_vuint128;
+  } source, result, exp_result;
+  
+  /* Result is not zero or denormal.  */
+#ifdef _BIG_ENDIAN
+  exp_result.val_ull[0] = 0x00056789ABCDEF0ULL | NOT_ZERO_OR_DENORMAL;
+  exp_result.val_ull[1] = 0x123456789ABCDEFULL;
+#else
+  exp_result.val_ull[1] = 0x00056789ABCDEF0ULL | NOT_ZERO_OR_DENORMAL;
+  exp_result.val_ull[0] = 0x123456789ABCDEFULL;
+#endif
+  source.val_uint128 = 0x923456789ABCDEF0ULL;
+  source.val_uint128 = (source.val_uint128 << 64) | 0x123456789ABCDEFULL;
+
+  /* Note, bits[0:14] are set to 0, bit[15] is 0 if the input was zero or
+     Denormal, 1 otherwise.  */
+  result.val_vuint128 = get_significand (&source.val_ieee128);
+
+  if ((result.val_ull[0] != exp_result.val_ull[0])
+      || (result.val_ull[1] != exp_result.val_ull[1]))
+#if DEBUG
+    {
+      printf("result[0] = 0x%llx; exp_result[0] = 0x%llx\n",
+	     result.val_ull[0], exp_result.val_ull[0]);
+      printf("result[1] = 0x%llx; exp_result[1] = 0x%llx\n",
+	     result.val_ull[1], exp_result.val_ull[1]);
+    }
+#else
+    abort();
+#endif
+  return 0;
+}
+
+/* Check that the expected extract significand instruction is generated. */
+/* { dg-final { scan-assembler-times {\mxsxsigqp\M} 1 } } */
diff --git a/gcc/testsuite/gcc.target/powerpc/bfp/scalar-insert-exp-16.c b/gcc/testsuite/gcc.target/powerpc/bfp/scalar-insert-exp-16.c
new file mode 100644
index 00000000000..f0e03c5173d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/bfp/scalar-insert-exp-16.c
@@ -0,0 +1,103 @@
+/* { dg-do run { target { powerpc*-*-* } } } */
+/* { dg-require-effective-target lp64 } */
+/* { dg-require-effective-target p9vector_hw } */
+/* { dg-options "-mdejagnu-cpu=power9 -save-temps" } */
+
+#include <altivec.h>
+#include <stdlib.h>
+
+#ifdef DEBUG
+#include <stdio.h>
+#endif
+
+__ieee128
+insert_exponent (vector unsigned __int128 *significand_p,
+		 vector unsigned long long int *exponent_p)
+{
+  vector unsigned __int128 significand = *significand_p;
+  vector unsigned long long int exponent = *exponent_p;
+
+  return scalar_insert_exp (significand, exponent);
+}
+
+__ieee128
+insert_exponent2 (unsigned __int128 significand,
+		 unsigned long long int exponent)
+{
+   return scalar_insert_exp (significand, exponent);
+}
+
+int
+main ()
+{
+  __ieee128 val_ieee128, result_ieee128, exp_result_ieee128;
+  unsigned __int128 val_int128;
+  unsigned long long int  val_ull;
+  union conv128_t
+   {
+     __ieee128 val_ieee128;
+     vector unsigned __int128 val_vint128;
+     vector unsigned long long int  val_vull;
+  } result, exp_result, significand;
+
+  vector unsigned long long int exponent;
+
+  /* Scalar argument test */
+  val_ieee128 = 0xFEDCBA9876543210ULL;
+  val_ull = 0x5678;
+#ifdef _BIG_ENDIAN
+  exp_result.val_vull[1] = 0xfedcba9876543210;  
+  exp_result.val_vull[0] = 0x5678000000000000ULL;
+#else
+  exp_result.val_vull[0] = 0xfedcba9876543210;  
+  exp_result.val_vull[1] = 0x5678000000000000ULL;
+#endif
+  result_ieee128 = insert_exponent2 (val_ieee128, val_ull);
+
+  if (result_ieee128 != exp_result.val_ieee128)
+#ifdef DEBUG
+    {
+      result.val_ieee128 = result_ieee128;
+      printf("Scalar argument ERROR:\n");
+      printf(" val_ieee128 = 0x%llx %llx\n",
+	     result.val_vull[1], result.val_vull[0]);
+      printf(" exp_val_ieee128 = 0x%llx %llx\n",
+	     exp_result.val_vull[1], exp_result.val_vull[0]);
+    }
+#else
+    abort ();
+#endif
+
+  /* Vector argument test */
+  significand.val_vull[0] = 0xFEDCBA9876543210ULL;
+  significand.val_vull[1] = 0x7FFF12345678ABCDULL;  /* positive value */
+
+  exponent[0] = 0x5678;
+  exponent[1] = 0x1234;
+
+#ifdef _BIG_ENDIAN
+  exp_result.val_vull[0] = 0xD678BA9876543210ULL;
+  exp_result.val_vull[1] = 0x7FFF12345678ABCDULL;
+#else
+  exp_result.val_vull[0] = 0xFEDCBA9876543210ULL;
+  exp_result.val_vull[1] = 0x123412345678ABCDULL;
+#endif
+  result.val_ieee128 = insert_exponent(&significand.val_vint128, &exponent);
+  
+  if (result.val_ieee128 != exp_result.val_ieee128)
+#ifdef DEBUG
+    {
+      printf("Vector argument ERROR:\n");
+      printf(" result = 0x%llx %llx\n",
+	     result.val_vull[1], result.val_vull[0]);
+      printf(" exp_result = 0x%llx %llx\n",
+	     exp_result.val_vull[1], exp_result.val_vull[0]);
+    }
+#else
+    abort ();
+#endif
+
+}
+
+/* Check that the expected insert exponent instruction is generated. */
+/* { dg-final { scan-assembler-times {\mxsiexpqp\M} 2 } } */
-- 
2.37.2



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2023-06-19 18:54 [PATCH ver 6] rs6000: Add builtins for IEEE 128-bit floating point values Carl Love
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