New testcase. Shrinking the variable to a bool allows instcombine to delete

the condition.

llvm-svn: 18816

test/Regression/Transforms/GlobalOpt/integer-bool.ll

@@ -0,0 +1,22 @@
+; RUN: llvm-as < %s | opt -globalopt -instcombine | llvm-dis | grep 'ret bool true'
+
+;; check that global opt turns integers that only hold 0 or 1 into bools.
+
+%G = internal global int 0    ;; This only holds 0 or 1.
+
+implementation
+
+void %set1() {
+	store int 0, int* %G
+	ret void
+}
+void %set2() {
+	store int 1, int* %G
+	ret void
+}
+
+bool %get() {
+	%A = load int* %G
+	%C = setlt int %A, 2  ;; always true
+	ret bool %C
+}