[PATCH][MIPS] Add aliases for sync instruction used by Octeon CPU

[Kai Nacke]

Hi Daniel,

the attached patch adds aliases for the sync instruction (synciobdma, 
syncs, syncw, syncws) which are used by the Octeon CPU.

Please review.

Regards,
Kai
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diff --git a/lib/Target/Mips/Mips64InstrInfo.td b/lib/Target/Mips/Mips64InstrInfo.td
index f0b6814..e169f0b 100644
--- a/lib/Target/Mips/Mips64InstrInfo.td
+++ b/lib/Target/Mips/Mips64InstrInfo.td
@@ -510,3 +510,9 @@ def : MipsInstAlias<"dmtc0 $rt, $rd", (DMTC0 GPR64Opnd:$rt, GPR64Opnd:$rd, 0), 0
 def : MipsInstAlias<"dmfc2 $rt, $rd", (DMFC2 GPR64Opnd:$rt, GPR64Opnd:$rd, 0), 0>;
 def : MipsInstAlias<"dmtc2 $rt, $rd", (DMTC2 GPR64Opnd:$rt, GPR64Opnd:$rd, 0), 0>;
 
+let Predicates = [HasMips64, HasCnMips] in {
+def : MipsInstAlias<"synciobdma", (SYNC 0x2), 0>;
+def : MipsInstAlias<"syncs",      (SYNC 0x6), 0>;
+def : MipsInstAlias<"syncw",      (SYNC 0x4), 0>;
+def : MipsInstAlias<"syncws",     (SYNC 0x5), 0>;
+}
diff --git a/test/MC/Mips/octeon-instructions.s b/test/MC/Mips/octeon-instructions.s
index b7c89b4..2922744 100644
--- a/test/MC/Mips/octeon-instructions.s
+++ b/test/MC/Mips/octeon-instructions.s
@@ -35,6 +35,10 @@
 # CHECK: sne   $23, $23, $20          # encoding: [0x72,0xf4,0xb8,0x2b]
 # CHECK: snei  $4, $16, -313          # encoding: [0x72,0x04,0xb1,0xef]
 # CHECK: snei  $26, $26, 511          # encoding: [0x73,0x5a,0x7f,0xef]
+# CHECK: sync  2                      # encoding: [0x00,0x00,0x00,0x8f]
+# CHECK: sync  6                      # encoding: [0x00,0x00,0x01,0x8f]
+# CHECK: sync  4                      # encoding: [0x00,0x00,0x01,0x0f]
+# CHECK: sync  5                      # encoding: [0x00,0x00,0x01,0x4f]
 # CHECK: v3mulu $21, $10, $21         # encoding: [0x71,0x55,0xa8,0x11]
 # CHECK: v3mulu $20, $20, $10         # encoding: [0x72,0x8a,0xa0,0x11]
 # CHECK: vmm0  $3, $19, $16           # encoding: [0x72,0x70,0x18,0x10]
@@ -77,6 +81,10 @@
   sne   $23, $20
   snei  $4, $16, -313
   snei  $26, 511
+  synciobdma
+  syncs
+  syncw
+  syncws
   v3mulu $21, $10, $21
   v3mulu $20, $10
   vmm0  $3, $19, $16