R600/SI: Add pattern for zero-extending i1 to i32

Fixes opencl-example if_* tests with radeonsi.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74469

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
llvm-svn: 200830

llvm/lib/Target/R600/SIInstructions.td

@@ -1838,6 +1838,11 @@ def : Pat <
   (V_CNDMASK_B32_e64 (i32 0), (i32 -1), $src0)
 >;
 
+def : Pat <
+  (i32 (zext i1:$src0)),
+  (V_CNDMASK_B32_e64 (i32 0), (i32 1), $src0)
+>;
+
 // 1. Offset as 8bit DWORD immediate
 def : Pat <
   (SIload_constant i128:$sbase, IMM8bitDWORD:$offset),

llvm/test/CodeGen/R600/zero_extend.ll

@@ -16,3 +16,13 @@ entry:
   store i64 %2, i64 addrspace(1)* %out
   ret void
 }
+
+; SI-CHECK-LABEL: @testi1toi32
+; SI-CHECK: V_CNDMASK_B32
+define void @testi1toi32(i32 addrspace(1)* %out, i32 %a, i32 %b) {
+entry:
+  %0 = icmp eq i32 %a, %b
+  %1 = zext i1 %0 to i32
+  store i32 %1, i32 addrspace(1)* %out
+  ret void
+}