arm.md (split for eq(reg, 0)): Add variants for ARMv5 and Thumb2.

	(peepholes for eq(reg, not-0)): Ensure condition register is dead after
	pattern.  Use more efficient sequences on ARMv5 and Thumb2.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@200197 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 84 insertions, 10 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 08f40a3b24d..3d89e3e6834 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2013-06-19  Richard Earnshaw  <rearnsha@arm.com>
+
+	arm.md (split for eq(reg, 0)): Add variants for ARMv5 and Thumb2.
+	(peepholes for eq(reg, not-0)): Ensure condition register is dead after
+	pattern.  Use more efficient sequences on ARMv5 and Thumb2.
+
 2013-06-19  Steven Bosscher  <steven@gcc.gnu.org>
 
 	PR target/57609
diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md
index 048a154e73c..42c21098db8 100644
--- a/gcc/config/arm/arm.md
+++ b/gcc/config/arm/arm.md
@@ -10021,6 +10021,16 @@
 	(eq:SI (match_operand:SI 1 "s_register_operand" "")
 	       (const_int 0)))
    (clobber (reg:CC CC_REGNUM))]
+  "arm_arch5 && TARGET_32BIT"
+  [(set (match_dup 0) (clz:SI (match_dup 1)))
+   (set (match_dup 0) (lshiftrt:SI (match_dup 0) (const_int 5)))]
+)
+
+(define_split
+  [(set (match_operand:SI 0 "s_register_operand" "")
+	(eq:SI (match_operand:SI 1 "s_register_operand" "")
+	       (const_int 0)))
+   (clobber (reg:CC CC_REGNUM))]
   "TARGET_32BIT && reload_completed"
   [(parallel
     [(set (reg:CC CC_REGNUM)
@@ -10090,29 +10100,87 @@
 
 ;; Attempt to improve the sequence generated by the compare_scc splitters
 ;; not to use conditional execution.
+
+;; Rd = (eq (reg1) (const_int0))  // ARMv5
+;;	clz Rd, reg1
+;;	lsr Rd, Rd, #5
 (define_peephole2
   [(set (reg:CC CC_REGNUM)
 	(compare:CC (match_operand:SI 1 "register_operand" "")
-		    (match_operand:SI 2 "arm_rhs_operand" "")))
+		    (const_int 0)))
+   (cond_exec (ne (reg:CC CC_REGNUM) (const_int 0))
+	      (set (match_operand:SI 0 "register_operand" "") (const_int 0)))
+   (cond_exec (eq (reg:CC CC_REGNUM) (const_int 0))
+	      (set (match_dup 0) (const_int 1)))]
+  "arm_arch5 && TARGET_32BIT && peep2_regno_dead_p (3, CC_REGNUM)"
+  [(set (match_dup 0) (clz:SI (match_dup 1)))
+   (set (match_dup 0) (lshiftrt:SI (match_dup 0) (const_int 5)))]
+)
+
+;; Rd = (eq (reg1) (const_int0))  // !ARMv5
+;;	negs Rd, reg1
+;;	adc  Rd, Rd, reg1
+(define_peephole2
+  [(set (reg:CC CC_REGNUM)
+	(compare:CC (match_operand:SI 1 "register_operand" "")
+		    (const_int 0)))
    (cond_exec (ne (reg:CC CC_REGNUM) (const_int 0))
 	      (set (match_operand:SI 0 "register_operand" "") (const_int 0)))
    (cond_exec (eq (reg:CC CC_REGNUM) (const_int 0))
 	      (set (match_dup 0) (const_int 1)))
-   (match_scratch:SI 3 "r")]
-  "TARGET_32BIT"
+   (match_scratch:SI 2 "r")]
+  "TARGET_32BIT && peep2_regno_dead_p (3, CC_REGNUM)"
   [(parallel
     [(set (reg:CC CC_REGNUM)
-	  (compare:CC (match_dup 1) (match_dup 2)))
-     (set (match_dup 3) (minus:SI (match_dup 1) (match_dup 2)))])
+	  (compare:CC (const_int 0) (match_dup 1)))
+     (set (match_dup 2) (minus:SI (const_int 0) (match_dup 1)))])
+   (set (match_dup 0)
+	(plus:SI (plus:SI (match_dup 1) (match_dup 2))
+		 (geu:SI (reg:CC CC_REGNUM) (const_int 0))))]
+)
+
+;; Rd = (eq (reg1) (reg2/imm))	// ARMv5
+;;	sub  Rd, Reg1, reg2
+;;	clz  Rd, Rd
+;;	lsr  Rd, Rd, #5
+(define_peephole2
+  [(set (reg:CC CC_REGNUM)
+	(compare:CC (match_operand:SI 1 "register_operand" "")
+		    (match_operand:SI 2 "arm_rhs_operand" "")))
+   (cond_exec (ne (reg:CC CC_REGNUM) (const_int 0))
+	      (set (match_operand:SI 0 "register_operand" "") (const_int 0)))
+   (cond_exec (eq (reg:CC CC_REGNUM) (const_int 0))
+	      (set (match_dup 0) (const_int 1)))]
+  "arm_arch5 && TARGET_32BIT && peep2_regno_dead_p (3, CC_REGNUM)"
+  [(set (match_dup 0) (minus:SI (match_dup 1) (match_dup 2)))
+   (set (match_dup 0) (clz:SI (match_dup 0)))
+   (set (match_dup 0) (lshiftrt:SI (match_dup 0) (const_int 5)))]
+)
+
+
+;; Rd = (eq (reg1) (reg2/imm))	// ! ARMv5
+;;	sub  T1, Reg1, reg2
+;;	negs Rd, T1
+;;	adc  Rd, Rd, T1
+(define_peephole2
+  [(set (reg:CC CC_REGNUM)
+	(compare:CC (match_operand:SI 1 "register_operand" "")
+		    (match_operand:SI 2 "arm_rhs_operand" "")))
+   (cond_exec (ne (reg:CC CC_REGNUM) (const_int 0))
+	      (set (match_operand:SI 0 "register_operand" "") (const_int 0)))
+   (cond_exec (eq (reg:CC CC_REGNUM) (const_int 0))
+	      (set (match_dup 0) (const_int 1)))
+   (match_scratch:SI 3 "r")]
+  "TARGET_32BIT && peep2_regno_dead_p (3, CC_REGNUM)"
+  [(set (match_dup 3) (minus:SI (match_dup 1) (match_dup 2)))
    (parallel
     [(set (reg:CC CC_REGNUM)
 	  (compare:CC (const_int 0) (match_dup 3)))
      (set (match_dup 0) (minus:SI (const_int 0) (match_dup 3)))])
-   (parallel
-    [(set (match_dup 0)
-	  (plus:SI (plus:SI (match_dup 0) (match_dup 3))
-		   (geu:SI (reg:CC CC_REGNUM) (const_int 0))))
-     (clobber (reg:CC CC_REGNUM))])])
+   (set (match_dup 0)
+	(plus:SI (plus:SI (match_dup 0) (match_dup 3))
+		 (geu:SI (reg:CC CC_REGNUM) (const_int 0))))]
+)
 
 (define_insn "*cond_move"
   [(set (match_operand:SI 0 "s_register_operand" "=r,r,r")