Revert sparc "U" constraint removal.

	PR bootstrap/55211
	Revert:
    	* config/sparc/constraints.md ("U"): Delete.
    	* config/sparc/sparc.md: Use 'r' constraint instead of 'U'.
    	* config/sparc/sync.md: Likewise.
	And revert parts of:
	* doc/md.texi: Sync sparc constraint documentation with reality.

From-SVN: r193283

3 files changed, 20 insertions, 11 deletions

diff --git a/gcc/config/sparc/constraints.md b/gcc/config/sparc/constraints.md
index 71670ee..2f8c6ad 100644
--- a/gcc/config/sparc/constraints.md
+++ b/gcc/config/sparc/constraints.md
@@ -18,7 +18,7 @@
 ;; <http://www.gnu.org/licenses/>.
 
 ;;; Unused letters:
-;;;    AB                  U
+;;;    AB
 ;;;    a        jkl    q  tuv xyz
 
 
@@ -130,6 +130,15 @@
       (match_code "mem")
       (match_test "memory_ok_for_ldd (op)")))
 
+;; Not needed in 64-bit mode
+(define_constraint "U"
+ "Pseudo-register or hard even-numbered integer register"
+ (and (match_test "TARGET_ARCH32")
+      (match_code "reg")
+      (ior (match_test "REGNO (op) < FIRST_PSEUDO_REGISTER")
+	   (not (match_test "reload_in_progress && reg_renumber [REGNO (op)] < 0")))
+      (match_test "register_ok_for_ldd (op)")))
+
 ;; Equivalent to 'T' but available in 64-bit mode
 (define_memory_constraint "W"
  "Memory reference for 'e' constraint floating-point register"
diff --git a/gcc/config/sparc/sparc.md b/gcc/config/sparc/sparc.md
index 4a44078..f604f46 100644
--- a/gcc/config/sparc/sparc.md
+++ b/gcc/config/sparc/sparc.md
@@ -1595,9 +1595,9 @@
 
 (define_insn "*movdi_insn_sp32"
   [(set (match_operand:DI 0 "nonimmediate_operand"
-					"=T,o,T,r,o,r,r,r,?T,?*f,?*f,?o,?*e,?*e,  r,?*f,?*e,?W,b,b")
+					"=T,o,T,U,o,r,r,r,?T,?*f,?*f,?o,?*e,?*e,  r,?*f,?*e,?W,b,b")
         (match_operand:DI 1 "input_operand"
-					" J,J,r,T,r,o,i,r,*f,  T,  o,*f, *e, *e,?*f,  r,  W,*e,J,P"))]
+					" J,J,U,T,r,o,i,r,*f,  T,  o,*f, *e, *e,?*f,  r,  W,*e,J,P"))]
   "! TARGET_ARCH64
    && (register_operand (operands[0], DImode)
        || register_or_zero_operand (operands[1], DImode))"
@@ -2302,8 +2302,8 @@
 })
 
 (define_insn "*movdf_insn_sp32"
-  [(set (match_operand:DF 0 "nonimmediate_operand" "=b,b,e,e,*r, f,  e,T,W,r,T,  f,  *r,  o,o")
-	(match_operand:DF 1 "input_operand"         "G,C,e,e, f,*r,W#F,G,e,T,r,o#F,*roF,*rG,f"))]
+  [(set (match_operand:DF 0 "nonimmediate_operand" "=b,b,e,e,*r, f,  e,T,W,U,T,  f,  *r,  o,o")
+	(match_operand:DF 1 "input_operand"         "G,C,e,e, f,*r,W#F,G,e,T,U,o#F,*roF,*rG,f"))]
   "! TARGET_ARCH64
    && (register_operand (operands[0], DFmode)
        || register_or_zero_or_all_ones_operand (operands[1], DFmode))"
@@ -2541,8 +2541,8 @@
 })
 
 (define_insn "*movtf_insn_sp32"
-  [(set (match_operand:TF 0 "nonimmediate_operand" "=b, e,o, o,r,  r")
-	(match_operand:TF 1 "input_operand"        " G,oe,e,rG,o,roG"))]
+  [(set (match_operand:TF 0 "nonimmediate_operand" "=b, e,o,  o,U,  r")
+	(match_operand:TF 1 "input_operand"        " G,oe,e,rGU,o,roG"))]
   "! TARGET_ARCH64
    && (register_operand (operands[0], TFmode)
        || register_or_zero_operand (operands[1], TFmode))"
@@ -7911,8 +7911,8 @@
    (set_attr "cpu_feature" "vis,vis,vis,*,*,*,*,*,vis3,vis3,*")])
 
 (define_insn "*mov<VM64:mode>_insn_sp32"
-  [(set (match_operand:VM64 0 "nonimmediate_operand" "=e,e,e,*r, f,e,m,m,r,T, o,*r")
-	(match_operand:VM64 1 "input_operand"         "Y,C,e, f,*r,m,e,Y,T,r,*r,*r"))]
+  [(set (match_operand:VM64 0 "nonimmediate_operand" "=e,e,e,*r, f,e,m,m,U,T, o,*r")
+	(match_operand:VM64 1 "input_operand"         "Y,C,e, f,*r,m,e,Y,T,U,*r,*r"))]
   "TARGET_VIS
    && ! TARGET_ARCH64
    && (register_operand (operands[0], <VM64:MODE>mode)
diff --git a/gcc/config/sparc/sync.md b/gcc/config/sparc/sync.md
index 302cd74..d11f663 100644
--- a/gcc/config/sparc/sync.md
+++ b/gcc/config/sparc/sync.md
@@ -115,7 +115,7 @@
 })
 
 (define_insn "atomic_loaddi_1"
-  [(set (match_operand:DI 0 "register_operand" "=r,?*f")
+  [(set (match_operand:DI 0 "register_operand" "=U,?*f")
 	(unspec:DI [(match_operand:DI 1 "memory_operand" "m,m")]
 		   UNSPEC_ATOMIC))]
   "!TARGET_ARCH64"
@@ -144,7 +144,7 @@
 (define_insn "atomic_storedi_1"
   [(set (match_operand:DI 0 "memory_operand" "=m,m,m")
 	(unspec:DI
-	  [(match_operand:DI 1 "register_or_v9_zero_operand" "J,r,?*f")]
+	  [(match_operand:DI 1 "register_or_v9_zero_operand" "J,U,?*f")]
 	  UNSPEC_ATOMIC))]
   "!TARGET_ARCH64"
   "@