rs6000, remove built-ins __builtin_vsx_set_1ti, __builtin_vsx_set_2df, __builtin_vsx_set_2di

The built-ins set a value in a vector.  The same operation can be done
in C-code.  The assembly code generated from the C-code is as good or
better than the code generated by the built-ins.  With default
optimization the number of assembly generated for the two methods are
similar.  With -O3 optimization, the assembly generated for the two
approaches is identical for the 2DF and 2DI types.  The assembly for
the C-code version of the 1Ti requires one less assembly instruction.
It also only uses one load versus two loads for the built-in.

With the removal of the built-ins, there are no other uses of the
set built-in attribute.  The code associated with the set built-in
attribute is removed.

Finally, the testcase for the __builtin_vsx_set_2df is removed.  The
other built-ins do not have testcases.

gcc/ChangeLog:
	* config/rs6000/rs6000-builtin.cc (get_element_number,
	altivec_expand_vec_set_builtin): Remove functions.
	(rs6000_expand_builtin): Remove the if statement to call
	altivec_expand_vec_set_builtin.
	* config/rs6000/rs6000-builtins.def (__builtin_vsx_set_1ti,
	__builtin_vsx_set_2df, __builtin_vsx_set_2di): Remove the
	built-in definitions.
	* config/rs6000/rs6000-gen-builtins.cc (struct attrinfo):
	Remove the isset variable from the structure.
	(parse_bif_attrs): Remove the uses of the isset variable.

gcc/testsuite/ChangeLog:
	* gcc.target/powerpc/vsx-builtin-3.c: Remove test cases for the
	__builtin_vsx_set_2df built-in.

4 files changed, 10 insertions, 87 deletions

diff --git a/gcc/config/rs6000/rs6000-builtin.cc b/gcc/config/rs6000/rs6000-builtin.cc
index 117cf01..099cbc8 100644
--- a/gcc/config/rs6000/rs6000-builtin.cc
+++ b/gcc/config/rs6000/rs6000-builtin.cc
@@ -2313,56 +2313,6 @@ altivec_expand_predicate_builtin (enum insn_code icode, tree exp, rtx target)
   return target;
 }
 
-/* Return the integer constant in ARG.  Constrain it to be in the range
-   of the subparts of VEC_TYPE; issue an error if not.  */
-
-static int
-get_element_number (tree vec_type, tree arg)
-{
-  unsigned HOST_WIDE_INT elt, max = TYPE_VECTOR_SUBPARTS (vec_type) - 1;
-
-  if (!tree_fits_uhwi_p (arg)
-      || (elt = tree_to_uhwi (arg), elt > max))
-    {
-      error ("selector must be an integer constant in the range [0, %wi]", max);
-      return 0;
-    }
-
-  return elt;
-}
-
-/* Expand vec_set builtin.  */
-static rtx
-altivec_expand_vec_set_builtin (tree exp)
-{
-  machine_mode tmode, mode1;
-  tree arg0, arg1, arg2;
-  int elt;
-  rtx op0, op1;
-
-  arg0 = CALL_EXPR_ARG (exp, 0);
-  arg1 = CALL_EXPR_ARG (exp, 1);
-  arg2 = CALL_EXPR_ARG (exp, 2);
-
-  tmode = TYPE_MODE (TREE_TYPE (arg0));
-  mode1 = TYPE_MODE (TREE_TYPE (TREE_TYPE (arg0)));
-  gcc_assert (VECTOR_MODE_P (tmode));
-
-  op0 = expand_expr (arg0, NULL_RTX, tmode, EXPAND_NORMAL);
-  op1 = expand_expr (arg1, NULL_RTX, mode1, EXPAND_NORMAL);
-  elt = get_element_number (TREE_TYPE (arg0), arg2);
-
-  if (GET_MODE (op1) != mode1 && GET_MODE (op1) != VOIDmode)
-    op1 = convert_modes (mode1, GET_MODE (op1), op1, true);
-
-  op0 = force_reg (tmode, op0);
-  op1 = force_reg (mode1, op1);
-
-  rs6000_expand_vector_set (op0, op1, GEN_INT (elt));
-
-  return op0;
-}
-
 /* Expand vec_ext builtin.  */
 static rtx
 altivec_expand_vec_ext_builtin (tree exp, rtx target)
@@ -3365,9 +3315,6 @@ rs6000_expand_builtin (tree exp, rtx target, rtx /* subtarget */,
   if (bif_is_cpu (*bifaddr))
     return cpu_expand_builtin (fcode, exp, target);
 
-  if (bif_is_set (*bifaddr))
-    return altivec_expand_vec_set_builtin (exp);
-
   if (bif_is_extract (*bifaddr))
     return altivec_expand_vec_ext_builtin (exp, target);
 
diff --git a/gcc/config/rs6000/rs6000-builtins.def b/gcc/config/rs6000/rs6000-builtins.def
index dd80b81..12d131d 100644
--- a/gcc/config/rs6000/rs6000-builtins.def
+++ b/gcc/config/rs6000/rs6000-builtins.def
@@ -115,7 +115,6 @@
 ;
 ; Attributes are strings, and the allowed ones are listed below.
 ;
-;   set      Process as a vec_set function
 ;   extract  Process as a vec_extract function
 ;   nosoft   Not valid with -msoft-float
 ;   ldvec    Needs special handling for vec_ld semantics
@@ -1401,15 +1400,6 @@
   const vsll __builtin_vsx_mul_2di (vsll, vsll);
     MUL_V2DI vsx_mul_v2di {}
 
-  const vsq __builtin_vsx_set_1ti (vsq, signed __int128, const int<0,0>);
-    SET_1TI vsx_set_v1ti {set}
-
-  const vd __builtin_vsx_set_2df (vd, double, const int<0,1>);
-    SET_2DF vsx_set_v2df {set}
-
-  const vsll __builtin_vsx_set_2di (vsll, signed long long, const int<0,1>);
-    SET_2DI vsx_set_v2di {set}
-
   const vd __builtin_vsx_splat_2df (double);
     SPLAT_2DF vsx_splat_v2df {}
 
diff --git a/gcc/config/rs6000/rs6000-gen-builtins.cc b/gcc/config/rs6000/rs6000-gen-builtins.cc
index 7856d46..1e2e780 100644
--- a/gcc/config/rs6000/rs6000-gen-builtins.cc
+++ b/gcc/config/rs6000/rs6000-gen-builtins.cc
@@ -370,7 +370,6 @@ struct typelist
 /* Attributes of a builtin function.  */
 struct attrinfo
 {
-  bool isset;
   bool isextract;
   bool isnosoft;
   bool isldvec;
@@ -1394,9 +1393,7 @@ parse_bif_attrs (attrinfo *attrptr)
     attrname = match_identifier ();
     if (attrname)
       {
-	if (!strcmp (attrname, "set"))
-	  attrptr->isset = 1;
-	else if (!strcmp (attrname, "extract"))
+	if (!strcmp (attrname, "extract"))
 	  attrptr->isextract = 1;
 	else if (!strcmp (attrname, "nosoft"))
 	  attrptr->isnosoft = 1;
@@ -1469,14 +1466,14 @@ parse_bif_attrs (attrinfo *attrptr)
 
 #ifdef DEBUG
   diag (0,
-	"attribute set: set = %d, extract = %d, nosoft = %d, "
-	"ldvec = %d, stvec = %d, reve = %d, pred = %d, htm = %d, "
-	"htmspr = %d, htmcr = %d, mma = %d, quad = %d, pair = %d, "
-	"mmaint = %d, no32bit = %d, 32bit = %d, cpu = %d, ldstmask = %d, "
-	"lxvrse = %d, lxvrze = %d, endian = %d, ibmdld = %d, ibm128 = %d.\n",
-	attrptr->isset, attrptr->isextract, attrptr->isnosoft,
-	attrptr->isldvec, attrptr->isstvec, attrptr->isreve, attrptr->ispred,
-	attrptr->ishtm, attrptr->ishtmspr, attrptr->ishtmcr, attrptr->ismma,
+	"extract = %d, nosoft = %d, ldvec = %d, stvec = %d, reve = %d, "
+	"pred = %d, htm = %d, htmspr = %d, htmcr = %d, mma = %d, "
+	"quad = %d, pair = %d, mmaint = %d, no32bit = %d, 32bit = %d, "
+	"cpu = %d, ldstmask = %d, lxvrse = %d, lxvrze = %d, endian = %d, "
+	"ibmdld = %d, ibm128 = %d.\n",
+	attrptr->isextract, attrptr->isnosoft,attrptr->isldvec,
+	attrptr->isstvec, attrptr->isreve, attrptr->ispred, attrptr->ishtm,
+	attrptr->ishtmspr, attrptr->ishtmcr, attrptr->ismma,
 	attrptr->isquad, attrptr->ispair, attrptr->ismmaint,
 	attrptr->isno32bit, attrptr->is32bit, attrptr->iscpu,
 	attrptr->isldstmask, attrptr->islxvrse,	attrptr->islxvrze,
@@ -2271,8 +2268,7 @@ write_decls (void)
   fprintf (header_file, "  rs6000_gen_builtins assoc_bif;\n");
   fprintf (header_file, "};\n\n");
 
-  /* Bit pattern 0x00000001 is available.  */
-  fprintf (header_file, "#define bif_set_bit\t\t(0x00000002)\n");
+  /* Bit patterns 0x00000001 and 0x00000002 are available.  */
   fprintf (header_file, "#define bif_extract_bit\t\t(0x00000004)\n");
   fprintf (header_file, "#define bif_nosoft_bit\t\t(0x00000008)\n");
   fprintf (header_file, "#define bif_ldvec_bit\t\t(0x00000010)\n");
@@ -2297,8 +2293,6 @@ write_decls (void)
   fprintf (header_file, "#define bif_ibm128_bit\t\t(0x00800000)\n");
   fprintf (header_file, "\n");
   fprintf (header_file,
-	   "#define bif_is_set(x)\t\t((x).bifattrs & bif_set_bit)\n");
-  fprintf (header_file,
 	   "#define bif_is_extract(x)\t((x).bifattrs & bif_extract_bit)\n");
   fprintf (header_file,
 	   "#define bif_is_nosoft(x)\t((x).bifattrs & bif_nosoft_bit)\n");
@@ -2497,8 +2491,6 @@ write_bif_static_init (void)
       fprintf (init_file, "      /* nargs */\t%d,\n",
 	       bifp->proto.nargs);
       fprintf (init_file, "      /* bifattrs */\t0");
-      if (bifp->attrs.isset)
-	fprintf (init_file, " | bif_set_bit");
       if (bifp->attrs.isextract)
 	fprintf (init_file, " | bif_extract_bit");
       if (bifp->attrs.isnosoft)
diff --git a/gcc/testsuite/gcc.target/powerpc/vsx-builtin-3.c b/gcc/testsuite/gcc.target/powerpc/vsx-builtin-3.c
index d67f97c..67c93be 100644
--- a/gcc/testsuite/gcc.target/powerpc/vsx-builtin-3.c
+++ b/gcc/testsuite/gcc.target/powerpc/vsx-builtin-3.c
@@ -118,12 +118,6 @@ void do_concat (void)
   d[0][0] = __builtin_vsx_concat_2df (x, y);
 }
 
-void do_set (void)
-{
-  d[0][0] = __builtin_vsx_set_2df (d[0][1], x, 0);
-  d[1][0] = __builtin_vsx_set_2df (d[1][1], y, 1);
-}
-
 extern double z[][4];
 
 int do_math (void)