R600/SI: Add pattern for sign extension of i1 to i32.

16 more little piglits with radeonsi.

NOTE: This is a candidate for the Mesa stable branch.

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
llvm-svn: 175887

llvm/lib/Target/R600/SIInstructions.td

@@ -1382,6 +1382,11 @@ def : Pat <
                   0, 0, 0, 0), sub3)
 >;
 
+def : Pat <
+  (i32 (sext (i1 SReg_64:$src0))),
+  (V_CNDMASK_B32_e64 (i32 0), (i32 -1), SReg_64:$src0)
+>;
+
 /********** ================== **********/
 /**********   VOP3 Patterns    **********/
 /********** ================== **********/