thumb2.md (*thumb2_addsi3_compare0): New.

	gcc/
	* config/arm/thumb2.md (*thumb2_addsi3_compare0): New.
	(*thumb2_addsi3_compare0_scratch): New.
	* config/arm/constraints.md (Pv): New.
	* config/arm/arm.md (*addsi3_compare0): Remove FIXME comment. Use
	for ARM mode only.
	(*addsi3_compare0_scratch): Likewise.

From-SVN: r159983

gcc/ChangeLog

+2010-05-28  Julian Brown  <julian@codesourcery.com>
+
+	* config/arm/thumb2.md (*thumb2_addsi3_compare0): New.
+	(*thumb2_addsi3_compare0_scratch): New.
+	* config/arm/constraints.md (Pv): New.
+	* config/arm/arm.md (*addsi3_compare0): Remove FIXME comment. Use
+	for ARM mode only.
+	(*addsi3_compare0_scratch): Likewise.
+
 2010-05-28  Jan Hubicka  <jh@suse.cz>
 
 	* ipa-reference.c (add_static_var): Remove redundant all_module_statics check.

gcc/config/arm/arm.md

@@ -693,7 +693,6 @@
   ""
 )
 
-;; ??? Make Thumb-2 variants which prefer low regs
 (define_insn "*addsi3_compare0"
   [(set (reg:CC_NOOV CC_REGNUM)
 	(compare:CC_NOOV
@@ -702,7 +701,7 @@
 	 (const_int 0)))
    (set (match_operand:SI 0 "s_register_operand" "=r,r")
 	(plus:SI (match_dup 1) (match_dup 2)))]
-  "TARGET_32BIT"
+  "TARGET_ARM"
   "@
    add%.\\t%0, %1, %2
    sub%.\\t%0, %1, #%n2"
@@ -715,7 +714,7 @@
 	 (plus:SI (match_operand:SI 0 "s_register_operand" "r, r")
 		  (match_operand:SI 1 "arm_add_operand"    "rI,L"))
 	 (const_int 0)))]
-  "TARGET_32BIT"
+  "TARGET_ARM"
   "@
    cmn%?\\t%0, %1
    cmp%?\\t%0, #%n1"

gcc/config/arm/constraints.md

@@ -31,7 +31,7 @@
 ;; The following multi-letter normal constraints have been used:
 ;; in ARM/Thumb-2 state: Da, Db, Dc, Dn, Dl, DL, Dv, Dy
 ;; in Thumb-1 state: Pa, Pb
-;; in Thumb-2 state: Ps, Pt, Pu
+;; in Thumb-2 state: Ps, Pt, Pu, Pv
 
 ;; The following memory constraints have been used:
 ;; in ARM/Thumb-2 state: Q, Ut, Uv, Uy, Un, Um, Us
@@ -163,6 +163,11 @@
   (and (match_code "const_int")
        (match_test "TARGET_THUMB2 && ival >= 1 && ival <= 8")))
 
+(define_constraint "Pv"
+  "@internal In Thumb-2 state a constant in the range -255 to 0"
+  (and (match_code "const_int")
+       (match_test "TARGET_THUMB2 && ival >= -255 && ival <= 0")))
+
 (define_constraint "G"
  "In ARM/Thumb-2 state a valid FPA immediate constant."
  (and (match_code "const_double")

gcc/config/arm/thumb2.md

@@ -1254,6 +1254,56 @@
    (set_attr "length" "2")]
 )
 
+(define_insn "*thumb2_addsi3_compare0"
+  [(set (reg:CC_NOOV CC_REGNUM)
+	(compare:CC_NOOV
+	  (plus:SI (match_operand:SI 1 "s_register_operand" "l,  0, r")
+		   (match_operand:SI 2 "arm_add_operand"    "lPt,Ps,rIL"))
+	  (const_int 0)))
+   (set (match_operand:SI 0 "s_register_operand" "=l,l,r")
+	(plus:SI (match_dup 1) (match_dup 2)))]
+  "TARGET_THUMB2"
+  "*
+    HOST_WIDE_INT val;
+
+    if (GET_CODE (operands[2]) == CONST_INT)
+      val = INTVAL (operands[2]);
+    else
+      val = 0;
+
+    if (val < 0 && const_ok_for_arm (ARM_SIGN_EXTEND (-val)))
+      return \"subs\\t%0, %1, #%n2\";
+    else
+      return \"adds\\t%0, %1, %2\";
+  "
+  [(set_attr "conds" "set")
+   (set_attr "length" "2,2,4")]
+)
+
+(define_insn "*thumb2_addsi3_compare0_scratch"
+  [(set (reg:CC_NOOV CC_REGNUM)
+	(compare:CC_NOOV
+	  (plus:SI (match_operand:SI 0 "s_register_operand" "l,  r")
+		   (match_operand:SI 1 "arm_add_operand"    "lPv,rIL"))
+	  (const_int 0)))]
+  "TARGET_THUMB2"
+  "*
+    HOST_WIDE_INT val;
+
+    if (GET_CODE (operands[1]) == CONST_INT)
+      val = INTVAL (operands[1]);
+    else
+      val = 0;
+
+    if (val < 0 && const_ok_for_arm (ARM_SIGN_EXTEND (-val)))
+      return \"cmp\\t%0, #%n1\";
+    else
+      return \"cmn\\t%0, %1\";
+  "
+  [(set_attr "conds" "set")
+   (set_attr "length" "2,4")]
+)
+
 ;; 16-bit encodings of "muls" and "mul<c>".  We only use these when
 ;; optimizing for size since "muls" is slow on all known
 ;; implementations and since "mul<c>" will be generated by