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.

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index d7cd3df995ce3b0677cfa0b95a8bd3c9d338be8d..ea1a0706dcb9d758c0f2a596f0d642d9daf67faa 100644 (file)
--- 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")