i386: Fix VPMOV splitter [PR105993]

REGNO should not be used with register_operand before reload because
subregs of registers or even subregs of memory match the predicate.
The build with RTL checking enabled does not tolerate REGNO with
non-reg operand.
The patch splits the splitter into two related splitters and uses
(match_dup ...) RTXes instead of REGNO comparisons.

2022-06-17  Uroš Bizjak  <[email protected]>

gcc/ChangeLog:

	PR target/105993
	* config/i386/sse.md (vpmov splitter): Use (match_dup ...)
	instead of REGNO comparisons in combine splitter.

gcc/testsuite/ChangeLog:

	PR target/105993
	* gcc.target/i386/pr105993.c: New test.

Author: ubizjak

gcc/config/i386/sse.md

@@ -23875,21 +23875,23 @@
 	    (xor:V_128_256 (match_operand:V_128_256 1 "register_operand")
 			   (match_operand:V_128_256 2 "register_operand"))
 	    (match_operand:V_128_256 3 "nonimmediate_operand"))
-	  (match_operand:V_128_256 4 "register_operand")))]
-  "TARGET_XOP
-   && (REGNO (operands[4]) == REGNO (operands[1])
-       || REGNO (operands[4]) == REGNO (operands[2]))"
+	  (match_dup 1)))]
+  "TARGET_XOP"
   [(set (match_dup 0) (if_then_else:V_128_256 (match_dup 3)
-					      (match_dup 5)
-					      (match_dup 4)))]
-{
-  /* To handle the commutivity of XOR, operands[4] is either operands[1]
-     or operands[2], we need operands[5] to be the other one.  */
-  if (REGNO (operands[4]) == REGNO (operands[1]))
-    operands[5] = operands[2];
-  else
-    operands[5] = operands[1];
-})
+					      (match_dup 2)
+					      (match_dup 1)))])
+(define_split
+  [(set (match_operand:V_128_256 0 "register_operand")
+	(xor:V_128_256
+	  (and:V_128_256
+	    (xor:V_128_256 (match_operand:V_128_256 1 "register_operand")
+			   (match_operand:V_128_256 2 "register_operand"))
+	    (match_operand:V_128_256 3 "nonimmediate_operand"))
+	  (match_dup 2)))]
+  "TARGET_XOP"
+  [(set (match_dup 0) (if_then_else:V_128_256 (match_dup 3)
+					      (match_dup 1)
+					      (match_dup 2)))])
 
 ;; XOP horizontal add/subtract instructions
 (define_insn "xop_phadd<u>bw"

gcc/testsuite/gcc.target/i386/pr105993.c

@@ -0,0 +1,18 @@
+/* PR target/105993 */
+/* { dg-do compile } */
+/* { dg-options "-O -mxop" } */
+
+typedef unsigned short __attribute__((__vector_size__ (16))) V;
+V x, y, z;
+
+char c;
+short s;
+
+V
+foo (void)
+{
+  V u = __builtin_shufflevector (z, y, 2, 1, 0, 8, 4, 1, 7, 2);
+  V v = ~(__builtin_bswap16 (s) & (u ^ c));
+
+  return v;
+}