[PATCH] R600/SI: Specify S_ADD/S_SUB set SCC and add is commutable

[Matt Arsenault]

http://llvm-reviews.chandlerc.com/D2001

Files:
  lib/Target/R600/SIInstructions.td

Index: lib/Target/R600/SIInstructions.td
===================================================================
--- lib/Target/R600/SIInstructions.td
+++ lib/Target/R600/SIInstructions.td
@@ -1123,17 +1123,29 @@
 //def V_QSAD_U8 : VOP3_U8 <0x00000172, "V_QSAD_U8", []>;
 //def V_MQSAD_U8 : VOP3_U8 <0x00000173, "V_MQSAD_U8", []>;
 def V_TRIG_PREOP_F64 : VOP3_64 <0x00000174, "V_TRIG_PREOP_F64", []>;
-def S_ADD_U32 : SOP2_32 <0x00000000, "S_ADD_U32", []>;
-def S_SUB_U32 : SOP2_32 <0x00000001, "S_SUB_U32", []>;
-def S_ADD_I32 : SOP2_32 <0x00000002, "S_ADD_I32",
-  [(set i32:$dst, (add i32:$src0, i32:$src1))]
->;
-def S_SUB_I32 : SOP2_32 <0x00000003, "S_SUB_I32",
-  [(set i32:$dst, (sub i32:$src0, i32:$src1))]
->;
 
-def S_ADDC_U32 : SOP2_32 <0x00000004, "S_ADDC_U32", []>;
-def S_SUBB_U32 : SOP2_32 <0x00000005, "S_SUBB_U32", []>;
+let Defs = [SCC] in { // Carry out goes to SCC
+  let isCommutable = 1 in {
+    def S_ADD_U32 : SOP2_32 <0x00000000, "S_ADD_U32", []>;
+    def S_ADD_I32 : SOP2_32 <0x00000002, "S_ADD_I32",
+      [(set i32:$dst, (add i32:$src0, i32:$src1))]
+    >;
+  }
+
+  def S_SUB_U32 : SOP2_32 <0x00000001, "S_SUB_U32", []>;
+  def S_SUB_I32 : SOP2_32 <0x00000003, "S_SUB_I32",
+    [(set i32:$dst, (sub i32:$src0, i32:$src1))]
+  >;
+
+  let Uses = [SCC] in { // Carry in comes from SCC
+    let isCommutable = 1 in {
+      def S_ADDC_U32 : SOP2_32 <0x00000004, "S_ADDC_U32", []>;
+    }
+
+    def S_SUBB_U32 : SOP2_32 <0x00000005, "S_SUBB_U32", []>;
+  }
+}
+
 def S_MIN_I32 : SOP2_32 <0x00000006, "S_MIN_I32", []>;
 def S_MIN_U32 : SOP2_32 <0x00000007, "S_MIN_U32", []>;
 def S_MAX_I32 : SOP2_32 <0x00000008, "S_MAX_I32", []>;
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