Add a test to ensure a bitcast/and/trunc combination eliminates the bitcast.

llvm-svn: 31934

llvm/test/Regression/Transforms/InstCombine/cast-and-cast.ll

@@ -0,0 +1,14 @@
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep bitcast
+bool %test1(uint %val) {
+  %t1 = bitcast uint %val to int 
+  %t2 = and int %t1, 1
+  %t3 = trunc int %t2 to bool
+  ret bool %t3
+}
+
+short %test1(uint %val) {
+  %t1 = bitcast uint %val to int 
+  %t2 = and int %t1, 1
+  %t3 = trunc int %t2 to short
+  ret short %t3
+}