new testcase we handle

llvm-svn: 22741

llvm/test/Regression/Transforms/LoopStrengthReduce/variable_stride.ll

@@ -0,0 +1,17 @@
+; Check that variable strides are reduced to adds instead of multiplies.
+; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | not grep 'mul'
+
+declare bool %pred(int)
+
+void %test([10000 x int]* %P, int %STRIDE) {
+	br label %Loop
+Loop:
+	%INDVAR = phi int [0, %0], [%INDVAR2, %Loop]
+	%Idx = mul int %INDVAR, %STRIDE
+
+	%cond = call bool %pred(int %Idx)
+	%INDVAR2 = add int %INDVAR, 1
+	br bool %cond, label %Loop, label %Out
+Out:
+	ret void
+}