new testcase we handle

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22741 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/LoopStrengthReduce/variable_stride.ll b/test/Transforms/LoopStrengthReduce/variable_stride.ll
new file mode 100644 (file)
index 0000000..25103bf
--- /dev/null
+++ b/test/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
+}