rs6000: Do not allow out of range immediate in vsplt[bhw] (PR86987)

The original AltiVec manuals had the immediate lane number in the
splat instructions as a 5-bit number, but anything too big has no
defined meaning, and gas will choke on it too.  This patch disallows
it in the instruction patterns as well as in the builtins.  This
solves PR86987.


	PR target/86987
	* config/rs6000/altivec.md (altivec_vspltb): Use
	const_0_to_15_operand instead of u5bit_cint_operand.
	(*altivec_vspltb_internal): Ditto.
	(altivec_vspltb_direct): Ditto.
	(altivec_vsplth): Use const_0_to_7_operand instead of
	u5bit_cint_operand.
	(*altivec_vsplth_internal): Ditto.
	(altivec_vsplth_direct): Ditto.
	(altivec_vspltw): Use const_0_to_3_operand instead of
	u5bit_cint_operand.
	(*altivec_vspltw_internal): Ditto.
	(altivec_vspltw_direct): Ditto.
	(altivec_vspltsf): Ditto.
	(*altivec_vspltsf_internal): Ditto.
	* config/rs6000/rs6000.c (rs6000_expand_binop_builtin): Handle the
	various splats with the proper size immediate.  Reorder the various
	cases by ascending size of immediate, and put all such together.

From-SVN: r264584

3 files changed, 82 insertions, 31 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6be143e..12e7789 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,24 @@
+2018-09-25  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR target/86987
+	* config/rs6000/altivec.md (altivec_vspltb): Use
+	const_0_to_15_operand instead of u5bit_cint_operand.
+	(*altivec_vspltb_internal): Ditto.
+	(altivec_vspltb_direct): Ditto.
+	(altivec_vsplth): Use const_0_to_7_operand instead of
+	u5bit_cint_operand.
+	(*altivec_vsplth_internal): Ditto.
+	(altivec_vsplth_direct): Ditto.
+	(altivec_vspltw): Use const_0_to_3_operand instead of
+	u5bit_cint_operand.
+	(*altivec_vspltw_internal): Ditto.
+	(altivec_vspltw_direct): Ditto.
+	(altivec_vspltsf): Ditto.
+	(*altivec_vspltsf_internal): Ditto.
+	* config/rs6000/rs6000.c (rs6000_expand_binop_builtin): Handle the
+	various splats with the proper size immediate.  Reorder the various
+	cases by ascending size of immediate, and put all such together.
+
 2018-09-25  Richard Biener  <rguenther@suse.de>
 
 	PR debug/83941
diff --git a/gcc/config/rs6000/altivec.md b/gcc/config/rs6000/altivec.md
index 1ddf580..345be09 100644
--- a/gcc/config/rs6000/altivec.md
+++ b/gcc/config/rs6000/altivec.md
@@ -1861,7 +1861,7 @@
 (define_expand "altivec_vspltb"
   [(use (match_operand:V16QI 0 "register_operand"))
    (use (match_operand:V16QI 1 "register_operand"))
-   (use (match_operand:QI 2 "u5bit_cint_operand"))]
+   (use (match_operand:QI 2 "const_0_to_15_operand"))]
   "TARGET_ALTIVEC"
 {
   rtvec v = gen_rtvec (1, operands[2]);
@@ -1877,7 +1877,7 @@
         (vec_duplicate:V16QI
 	 (vec_select:QI (match_operand:V16QI 1 "register_operand" "v")
 			(parallel
-			 [(match_operand:QI 2 "u5bit_cint_operand" "")]))))]
+			 [(match_operand:QI 2 "const_0_to_15_operand" "")]))))]
   "TARGET_ALTIVEC"
 {
   if (!BYTES_BIG_ENDIAN)
@@ -1890,7 +1890,7 @@
 (define_insn "altivec_vspltb_direct"
   [(set (match_operand:V16QI 0 "register_operand" "=v")
         (unspec:V16QI [(match_operand:V16QI 1 "register_operand" "v")
-	               (match_operand:QI 2 "u5bit_cint_operand" "i")]
+	               (match_operand:QI 2 "const_0_to_15_operand" "i")]
                       UNSPEC_VSPLT_DIRECT))]
   "TARGET_ALTIVEC"
   "vspltb %0,%1,%2"
@@ -1899,7 +1899,7 @@
 (define_expand "altivec_vsplth"
   [(use (match_operand:V8HI 0 "register_operand"))
    (use (match_operand:V8HI 1 "register_operand"))
-   (use (match_operand:QI 2 "u5bit_cint_operand"))]
+   (use (match_operand:QI 2 "const_0_to_7_operand"))]
   "TARGET_ALTIVEC"
 {
   rtvec v = gen_rtvec (1, operands[2]);
@@ -1915,7 +1915,7 @@
 	(vec_duplicate:V8HI
 	 (vec_select:HI (match_operand:V8HI 1 "register_operand" "v")
 			(parallel
-			 [(match_operand:QI 2 "u5bit_cint_operand" "")]))))]
+			 [(match_operand:QI 2 "const_0_to_7_operand" "")]))))]
   "TARGET_ALTIVEC"
 {
   if (!BYTES_BIG_ENDIAN)
@@ -1928,7 +1928,7 @@
 (define_insn "altivec_vsplth_direct"
   [(set (match_operand:V8HI 0 "register_operand" "=v")
         (unspec:V8HI [(match_operand:V8HI 1 "register_operand" "v")
-                      (match_operand:QI 2 "u5bit_cint_operand" "i")]
+                      (match_operand:QI 2 "const_0_to_7_operand" "i")]
                      UNSPEC_VSPLT_DIRECT))]
   "TARGET_ALTIVEC"
   "vsplth %0,%1,%2"
@@ -1937,7 +1937,7 @@
 (define_expand "altivec_vspltw"
   [(use (match_operand:V4SI 0 "register_operand"))
    (use (match_operand:V4SI 1 "register_operand"))
-   (use (match_operand:QI 2 "u5bit_cint_operand"))]
+   (use (match_operand:QI 2 "const_0_to_3_operand"))]
   "TARGET_ALTIVEC"
 {
   rtvec v = gen_rtvec (1, operands[2]);
@@ -1953,7 +1953,7 @@
 	(vec_duplicate:V4SI
 	 (vec_select:SI (match_operand:V4SI 1 "register_operand" "v")
 			(parallel
-			 [(match_operand:QI 2 "u5bit_cint_operand" "i")]))))]
+			 [(match_operand:QI 2 "const_0_to_3_operand" "i")]))))]
   "TARGET_ALTIVEC"
 {
   if (!BYTES_BIG_ENDIAN)
@@ -1966,7 +1966,7 @@
 (define_insn "altivec_vspltw_direct"
   [(set (match_operand:V4SI 0 "register_operand" "=v")
         (unspec:V4SI [(match_operand:V4SI 1 "register_operand" "v")
-                      (match_operand:QI 2 "u5bit_cint_operand" "i")]
+                      (match_operand:QI 2 "const_0_to_3_operand" "i")]
                      UNSPEC_VSPLT_DIRECT))]
   "TARGET_ALTIVEC"
   "vspltw %0,%1,%2"
@@ -1975,7 +1975,7 @@
 (define_expand "altivec_vspltsf"
   [(use (match_operand:V4SF 0 "register_operand"))
    (use (match_operand:V4SF 1 "register_operand"))
-   (use (match_operand:QI 2 "u5bit_cint_operand"))]
+   (use (match_operand:QI 2 "const_0_to_3_operand"))]
   "TARGET_ALTIVEC"
 {
   rtvec v = gen_rtvec (1, operands[2]);
@@ -1991,7 +1991,7 @@
 	(vec_duplicate:V4SF
 	 (vec_select:SF (match_operand:V4SF 1 "register_operand" "v")
 			(parallel
-			 [(match_operand:QI 2 "u5bit_cint_operand" "i")]))))]
+			 [(match_operand:QI 2 "const_0_to_3_operand" "i")]))))]
   "VECTOR_UNIT_ALTIVEC_P (V4SFmode)"
 {
   if (!BYTES_BIG_ENDIAN)
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 5c7ab2b..baa5851 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -13456,13 +13456,58 @@ rs6000_expand_binop_builtin (enum insn_code icode, tree exp, rtx target)
   if (arg0 == error_mark_node || arg1 == error_mark_node)
     return const0_rtx;
 
-  if (icode == CODE_FOR_altivec_vcfux
+  if (icode == CODE_FOR_unpackv1ti
+	   || icode == CODE_FOR_unpackkf
+	   || icode == CODE_FOR_unpacktf
+	   || icode == CODE_FOR_unpackif
+	   || icode == CODE_FOR_unpacktd)
+    {
+      /* Only allow 1-bit unsigned literals. */
+      STRIP_NOPS (arg1);
+      if (TREE_CODE (arg1) != INTEGER_CST
+	  || !IN_RANGE (TREE_INT_CST_LOW (arg1), 0, 1))
+	{
+	  error ("argument 2 must be a 1-bit unsigned literal");
+	  return CONST0_RTX (tmode);
+	}
+    }
+  else if (icode == CODE_FOR_altivec_vspltw)
+    {
+      /* Only allow 2-bit unsigned literals.  */
+      STRIP_NOPS (arg1);
+      if (TREE_CODE (arg1) != INTEGER_CST
+	  || TREE_INT_CST_LOW (arg1) & ~3)
+	{
+	  error ("argument 2 must be a 2-bit unsigned literal");
+	  return CONST0_RTX (tmode);
+	}
+    }
+  else if (icode == CODE_FOR_altivec_vsplth)
+    {
+      /* Only allow 3-bit unsigned literals.  */
+      STRIP_NOPS (arg1);
+      if (TREE_CODE (arg1) != INTEGER_CST
+	  || TREE_INT_CST_LOW (arg1) & ~7)
+	{
+	  error ("argument 2 must be a 3-bit unsigned literal");
+	  return CONST0_RTX (tmode);
+	}
+    }
+  else if (icode == CODE_FOR_altivec_vspltb)
+    {
+      /* Only allow 4-bit unsigned literals.  */
+      STRIP_NOPS (arg1);
+      if (TREE_CODE (arg1) != INTEGER_CST
+	  || TREE_INT_CST_LOW (arg1) & ~15)
+	{
+	  error ("argument 2 must be a 4-bit unsigned literal");
+	  return CONST0_RTX (tmode);
+	}
+    }
+  else if (icode == CODE_FOR_altivec_vcfux
       || icode == CODE_FOR_altivec_vcfsx
       || icode == CODE_FOR_altivec_vctsxs
-      || icode == CODE_FOR_altivec_vctuxs
-      || icode == CODE_FOR_altivec_vspltb
-      || icode == CODE_FOR_altivec_vsplth
-      || icode == CODE_FOR_altivec_vspltw)
+      || icode == CODE_FOR_altivec_vctuxs)
     {
       /* Only allow 5-bit unsigned literals.  */
       STRIP_NOPS (arg1);
@@ -13507,21 +13552,6 @@ rs6000_expand_binop_builtin (enum insn_code icode, tree exp, rtx target)
 	  return CONST0_RTX (tmode);
 	}
     }
-  else if (icode == CODE_FOR_unpackv1ti
-	   || icode == CODE_FOR_unpackkf
-	   || icode == CODE_FOR_unpacktf
-	   || icode == CODE_FOR_unpackif
-	   || icode == CODE_FOR_unpacktd)
-    {
-      /* Only allow 1-bit unsigned literals. */
-      STRIP_NOPS (arg1);
-      if (TREE_CODE (arg1) != INTEGER_CST
-	  || !IN_RANGE (TREE_INT_CST_LOW (arg1), 0, 1))
-	{
-	  error ("argument 2 must be a 1-bit unsigned literal");
-	  return CONST0_RTX (tmode);
-	}
-    }
 
   if (target == 0
       || GET_MODE (target) != tmode