ret int %X
}
+int %test2() {
+ %A1 = load int* %A
+ br label %Loop
+Loop:
+ %AP = phi int [0, %0], [%X, %Loop]
+ store int %AP, int* %B ; Store cannot alias %A
+
+ %A2 = load int* %A
+ %X = sub int %A1, %A2
+ %c = seteq int %X, 0
+ br bool %c, label %out, label %Loop
+
+out:
+ ret int %X
+}
+
--- /dev/null
+; Test that LICM uses basicaa to do alias analysis, which is capable of
+; disambiguating some obvious cases. The ToRemove load should be eliminated
+; in this testcase. This testcase was carefully contrived so that GCSE would
+; not be able to eliminate the load itself, without licm's help. This is
+; because, for GCSE, the load is killed by the dummy basic block.
+
+; RUN: if as < %s | opt -basicaa -licm -gcse -simplifycfg -instcombine | dis | grep ToRemove
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+
+%A = global int 7
+%B = global int 8
+implementation
+
+int %test(bool %c) {
+ %Atmp = load int* %A
+ br label %Loop
+Loop:
+ %ToRemove = load int* %A
+ store int %ToRemove, int* %B ; Store cannot alias %A
+
+ br bool %c, label %Out, label %Loop
+Out:
+ ret int 7
+
+Dummy:
+ store int 7, int* %A
+ br label %Loop
+}
+
ret int %X
}
+int %test2() {
+ %A1 = load int* %A
+ br label %Loop
+Loop:
+ %AP = phi int [0, %0], [%X, %Loop]
+ store int %AP, int* %B ; Store cannot alias %A
+
+ %A2 = load int* %A
+ %X = sub int %A1, %A2
+ %c = seteq int %X, 0
+ br bool %c, label %out, label %Loop
+
+out:
+ ret int %X
+}
+
--- /dev/null
+; Test that LICM uses basicaa to do alias analysis, which is capable of
+; disambiguating some obvious cases. The ToRemove load should be eliminated
+; in this testcase. This testcase was carefully contrived so that GCSE would
+; not be able to eliminate the load itself, without licm's help. This is
+; because, for GCSE, the load is killed by the dummy basic block.
+
+; RUN: if as < %s | opt -basicaa -licm -gcse -simplifycfg -instcombine | dis | grep ToRemove
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+
+%A = global int 7
+%B = global int 8
+implementation
+
+int %test(bool %c) {
+ %Atmp = load int* %A
+ br label %Loop
+Loop:
+ %ToRemove = load int* %A
+ store int %ToRemove, int* %B ; Store cannot alias %A
+
+ br bool %c, label %Out, label %Loop
+Out:
+ ret int 7
+
+Dummy:
+ store int 7, int* %A
+ br label %Loop
+}
+