Initial testcases for basicaa alias analysis

llvm-svn: 3462

llvm/test/Regression/Transforms/BasicAA/Makefile

@@ -0,0 +1,10 @@
+
+LEVEL = ../../../..
+include $(LEVEL)/test/Makefile.tests
+
+TESTS := $(wildcard *.ll)
+
+all:: $(addprefix Output/, $(TESTS:%.ll=%.ll.out))
+
+Output/%.ll.out: %.ll Output/.dir $(LOPT)
+	-$(TESTRUNR) $<

llvm/test/Regression/Transforms/BasicAA/gcsetest.ll

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+; Test that GCSE uses basicaa to do alias analysis, which is capable of 
+; disambiguating some obvious cases.  All loads should be removable in 
+; this testcase.
+
+; RUN: if as < %s | opt -basicaa -gcse -instcombine -dce | dis | grep load
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+
+%A = global int 7
+%B = global int 8
+implementation
+
+int %test() {
+	%A1 = load int* %A
+
+	store int 123, int* %B  ; Store cannot alias %A
+
+	%A2 = load int* %A
+	%X = sub int %A1, %A2
+	ret int %X
+}
+