--- /dev/null
+declare i32 @llvm.r600.read.ngroups.x() nounwind readnone
+declare i32 @llvm.r600.read.ngroups.y() nounwind readnone
+declare i32 @llvm.r600.read.ngroups.z() nounwind readnone
+
+define i64 @get_num_groups(i32 %dim) nounwind readnone alwaysinline {
+ switch i32 %dim, label %default [i32 0, label %x_dim i32 1, label %y_dim i32 2, label %z_dim]
+x_dim:
+ %x = call i32 @llvm.r600.read.ngroups.x()
+ %x.ext = zext i32 %x to i64
+ ret i64 %x.ext
+y_dim:
+ %y = call i32 @llvm.r600.read.ngroups.y()
+ %y.ext = zext i32 %y to i64
+ ret i64 %y.ext
+z_dim:
+ %z = call i32 @llvm.r600.read.ngroups.z()
+ %z.ext = zext i32 %z to i64
+ ret i64 %z.ext
+default:
+ ret i64 1
+}