--- /dev/null
+--- a/gcc/config/mips/sync.md
++++ b/gcc/config/mips/sync.md
+@@ -136,7 +136,7 @@
+ [(match_operand:SI 1 "register_operand" "d")
+ (match_operand:SI 2 "register_operand" "d")
+ (atomic_hiqi_op:SI (match_dup 0)
+- (match_operand:SI 3 "register_operand" "dJ"))]
++ (match_operand:SI 3 "reg_or_0_operand" "dJ"))]
+ UNSPEC_SYNC_OLD_OP_12))
+ (clobber (match_scratch:SI 4 "=&d"))]
+ "GENERATE_LL_SC"
+@@ -177,7 +177,7 @@
+ [(match_operand:SI 2 "register_operand" "d")
+ (match_operand:SI 3 "register_operand" "d")
+ (atomic_hiqi_op:SI (match_dup 0)
+- (match_operand:SI 4 "register_operand" "dJ"))]
++ (match_operand:SI 4 "reg_or_0_operand" "dJ"))]
+ UNSPEC_SYNC_OLD_OP_12))
+ (clobber (match_scratch:SI 5 "=&d"))]
+ "GENERATE_LL_SC"
+@@ -218,7 +218,7 @@
+ (match_operand:SI 2 "register_operand" "d")
+ (match_operand:SI 3 "register_operand" "d")
+ (atomic_hiqi_op:SI (match_dup 0)
+- (match_operand:SI 4 "register_operand" "dJ"))]
++ (match_operand:SI 4 "reg_or_0_operand" "dJ"))]
+ UNSPEC_SYNC_NEW_OP_12))
+ (set (match_dup 1)
+ (unspec_volatile:SI
+@@ -259,7 +259,7 @@
+ [(match_operand:SI 1 "register_operand" "d")
+ (match_operand:SI 2 "register_operand" "d")
+ (match_dup 0)
+- (match_operand:SI 3 "register_operand" "dJ")]
++ (match_operand:SI 3 "reg_or_0_operand" "dJ")]
+ UNSPEC_SYNC_OLD_OP_12))
+ (clobber (match_scratch:SI 4 "=&d"))]
+ "GENERATE_LL_SC"
+@@ -298,7 +298,7 @@
+ (unspec_volatile:SI
+ [(match_operand:SI 2 "register_operand" "d")
+ (match_operand:SI 3 "register_operand" "d")
+- (match_operand:SI 4 "register_operand" "dJ")]
++ (match_operand:SI 4 "reg_or_0_operand" "dJ")]
+ UNSPEC_SYNC_OLD_OP_12))
+ (clobber (match_scratch:SI 5 "=&d"))]
+ "GENERATE_LL_SC"
+@@ -337,7 +337,7 @@
+ [(match_operand:SI 1 "memory_operand" "+R")
+ (match_operand:SI 2 "register_operand" "d")
+ (match_operand:SI 3 "register_operand" "d")
+- (match_operand:SI 4 "register_operand" "dJ")]
++ (match_operand:SI 4 "reg_or_0_operand" "dJ")]
+ UNSPEC_SYNC_NEW_OP_12))
+ (set (match_dup 1)
+ (unspec_volatile:SI
+@@ -546,7 +546,7 @@
+ (set (match_dup 1)
+ (unspec_volatile:SI [(match_operand:SI 2 "register_operand" "d")
+ (match_operand:SI 3 "register_operand" "d")
+- (match_operand:SI 4 "arith_operand" "dJ")]
++ (match_operand:SI 4 "reg_or_0_operand" "dJ")]
+ UNSPEC_SYNC_EXCHANGE_12))]
+ "GENERATE_LL_SC"
+ { return mips_output_sync_loop (insn, operands); }
--- /dev/null
+--- a/gcc/config/mips/sync.md
++++ b/gcc/config/mips/sync.md
+@@ -136,7 +136,7 @@
+ [(match_operand:SI 1 "register_operand" "d")
+ (match_operand:SI 2 "register_operand" "d")
+ (atomic_hiqi_op:SI (match_dup 0)
+- (match_operand:SI 3 "register_operand" "dJ"))]
++ (match_operand:SI 3 "reg_or_0_operand" "dJ"))]
+ UNSPEC_SYNC_OLD_OP_12))
+ (clobber (match_scratch:SI 4 "=&d"))]
+ "GENERATE_LL_SC"
+@@ -177,7 +177,7 @@
+ [(match_operand:SI 2 "register_operand" "d")
+ (match_operand:SI 3 "register_operand" "d")
+ (atomic_hiqi_op:SI (match_dup 0)
+- (match_operand:SI 4 "register_operand" "dJ"))]
++ (match_operand:SI 4 "reg_or_0_operand" "dJ"))]
+ UNSPEC_SYNC_OLD_OP_12))
+ (clobber (match_scratch:SI 5 "=&d"))]
+ "GENERATE_LL_SC"
+@@ -218,7 +218,7 @@
+ (match_operand:SI 2 "register_operand" "d")
+ (match_operand:SI 3 "register_operand" "d")
+ (atomic_hiqi_op:SI (match_dup 0)
+- (match_operand:SI 4 "register_operand" "dJ"))]
++ (match_operand:SI 4 "reg_or_0_operand" "dJ"))]
+ UNSPEC_SYNC_NEW_OP_12))
+ (set (match_dup 1)
+ (unspec_volatile:SI
+@@ -259,7 +259,7 @@
+ [(match_operand:SI 1 "register_operand" "d")
+ (match_operand:SI 2 "register_operand" "d")
+ (match_dup 0)
+- (match_operand:SI 3 "register_operand" "dJ")]
++ (match_operand:SI 3 "reg_or_0_operand" "dJ")]
+ UNSPEC_SYNC_OLD_OP_12))
+ (clobber (match_scratch:SI 4 "=&d"))]
+ "GENERATE_LL_SC"
+@@ -298,7 +298,7 @@
+ (unspec_volatile:SI
+ [(match_operand:SI 2 "register_operand" "d")
+ (match_operand:SI 3 "register_operand" "d")
+- (match_operand:SI 4 "register_operand" "dJ")]
++ (match_operand:SI 4 "reg_or_0_operand" "dJ")]
+ UNSPEC_SYNC_OLD_OP_12))
+ (clobber (match_scratch:SI 5 "=&d"))]
+ "GENERATE_LL_SC"
+@@ -337,7 +337,7 @@
+ [(match_operand:SI 1 "memory_operand" "+R")
+ (match_operand:SI 2 "register_operand" "d")
+ (match_operand:SI 3 "register_operand" "d")
+- (match_operand:SI 4 "register_operand" "dJ")]
++ (match_operand:SI 4 "reg_or_0_operand" "dJ")]
+ UNSPEC_SYNC_NEW_OP_12))
+ (set (match_dup 1)
+ (unspec_volatile:SI
+@@ -546,7 +546,7 @@
+ (set (match_dup 1)
+ (unspec_volatile:SI [(match_operand:SI 2 "register_operand" "d")
+ (match_operand:SI 3 "register_operand" "d")
+- (match_operand:SI 4 "arith_operand" "dJ")]
++ (match_operand:SI 4 "reg_or_0_operand" "dJ")]
+ UNSPEC_SYNC_EXCHANGE_12))]
+ "GENERATE_LL_SC"
+ { return mips_output_sync_loop (insn, operands); }