i386: Remove unnecessary clobbers from combine splitters.

There is no need for combine splitters to emit insn patterns with clobbers,
the pass is smart enough to add clobbers to patterns  as necessary.

2020-12-30  Uroš Bizjak  <ubizjak@gmail.com>

gcc/
	* config/i386/i386.md: Remove unnecessary clobbers
	from combine splitters.

1 files changed, 24 insertions, 37 deletions

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index d7cd3df..ea1a070 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -12693,12 +12693,10 @@
 	  [(not:SWI (match_operand:SWI 2 "register_operand"))
 	   (match_operand:SWI 3 "nonimmediate_operand")]))]
   ""
-  [(parallel
-     [(set (reg:CCC FLAGS_REG)
-	   (compare:CCC
-	     (plus:SWI (match_dup 2) (match_dup 3))
-	     (match_dup 2)))
-      (clobber (scratch:SWI))])
+  [(set (reg:CCC FLAGS_REG)
+	(compare:CCC
+	  (plus:SWI (match_dup 2) (match_dup 3))
+	  (match_dup 2)))
    (set (match_dup 0)
 	(match_op_dup 1 [(reg:CCC FLAGS_REG) (const_int 0)]))])
 
@@ -12709,12 +12707,10 @@
 	   (match_operand 3 "const_int_operand")]))]
   "TARGET_64BIT
    && IN_RANGE (exact_log2 (UINTVAL (operands[3]) + 1), 32, 63)"
-  [(parallel
-     [(set (reg:CCZ FLAGS_REG)
-	   (compare:CCZ
-	     (lshiftrt:DI (match_dup 2) (match_dup 4))
-	     (const_int 0)))
-      (clobber (scratch:DI))])
+  [(set (reg:CCZ FLAGS_REG)
+	(compare:CCZ
+	  (lshiftrt:DI (match_dup 2) (match_dup 4))
+	  (const_int 0)))
    (set (match_dup 0)
 	(match_op_dup 1 [(reg:CCZ FLAGS_REG) (const_int 0)]))]
 {
@@ -12905,12 +12901,10 @@
 	  (label_ref (match_operand 0))
 	  (pc)))]
   ""
-  [(parallel
-     [(set (reg:CCC FLAGS_REG)
-	   (compare:CCC
-	     (plus:SWI (match_dup 2) (match_dup 3))
-	     (match_dup 2)))
-      (clobber (scratch:SWI))])
+  [(set (reg:CCC FLAGS_REG)
+	(compare:CCC
+	  (plus:SWI (match_dup 2) (match_dup 3))
+	  (match_dup 2)))
    (set (pc)
 	(if_then_else (match_op_dup 1 [(reg:CCC FLAGS_REG) (const_int 0)])
 		      (label_ref (match_operand 0))
@@ -12926,12 +12920,10 @@
 	  (pc)))]
   "TARGET_64BIT
    && IN_RANGE (exact_log2 (UINTVAL (operands[3]) + 1), 32, 63)"
-  [(parallel
-     [(set (reg:CCZ FLAGS_REG)
-	   (compare:CCZ
-	     (lshiftrt:DI (match_dup 2) (match_dup 4))
-	     (const_int 0)))
-      (clobber (scratch:DI))])
+  [(set (reg:CCZ FLAGS_REG)
+	(compare:CCZ
+	  (lshiftrt:DI (match_dup 2) (match_dup 4))
+	  (const_int 0)))
    (set (pc)
 	(if_then_else (match_op_dup 1 [(reg:CCZ FLAGS_REG) (const_int 0)])
 		      (label_ref (match_operand 0))
@@ -18581,9 +18573,8 @@
    && INTVAL (operands[2]) != -1
    && INTVAL (operands[2]) != 2147483647"
   [(set (reg:CC FLAGS_REG) (compare:CC (match_dup 1) (match_dup 2)))
-   (parallel [(set (match_dup 0)
-		   (neg:SWI48 (ltu:SWI48 (reg:CC FLAGS_REG) (const_int 0))))
-	      (clobber (reg:CC FLAGS_REG))])]
+   (set (match_dup 0)
+	(neg:SWI48 (ltu:SWI48 (reg:CC FLAGS_REG) (const_int 0))))]
   "operands[2] = GEN_INT (INTVAL (operands[2]) + 1);")
 
 (define_split
@@ -18594,9 +18585,8 @@
 	    (const_int 0))))]
   ""
   [(set (reg:CC FLAGS_REG) (compare:CC (match_dup 1) (const_int 1)))
-   (parallel [(set (match_dup 0)
-		   (neg:SWI (ltu:SWI (reg:CC FLAGS_REG) (const_int 0))))
-	      (clobber (reg:CC FLAGS_REG))])])
+   (set (match_dup 0)
+	(neg:SWI (ltu:SWI (reg:CC FLAGS_REG) (const_int 0))))])
 
 (define_split
   [(set (match_operand:SWI 0 "register_operand")
@@ -18605,13 +18595,10 @@
 	    (match_operand 1 "int_nonimmediate_operand")
 	    (const_int 0))))]
   ""
-  [(parallel [(set (reg:CCC FLAGS_REG)
-		   (ne:CCC (match_dup 1) (const_int 0)))
-	      (clobber (match_dup 2))])
-   (parallel [(set (match_dup 0)
-		   (neg:SWI (ltu:SWI (reg:CCC FLAGS_REG) (const_int 0))))
-	      (clobber (reg:CC FLAGS_REG))])]
-  "operands[2] = gen_rtx_SCRATCH (GET_MODE (operands[1]));")
+  [(set (reg:CCC FLAGS_REG)
+	(ne:CCC (match_dup 1) (const_int 0)))
+   (set (match_dup 0)
+	(neg:SWI (ltu:SWI (reg:CCC FLAGS_REG) (const_int 0))))])
 
 (define_insn "*mov<mode>cc_noc"
   [(set (match_operand:SWI248 0 "register_operand" "=r,r")