testcase for A[invariant][indvar] where invariant is an instruction.

llvm-svn: 20500

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

@@ -0,0 +1,19 @@
+; Check that the index of 'P[outer]' is pulled out of the loop.
+; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | not grep 'getelementptr.*%outer.*%INDVAR'
+
+declare bool %pred()
+
+void %test([10000 x int]* %P, int %outer) {
+	br label %Loop
+Loop:
+	%INDVAR = phi int [0, %0], [%INDVAR2, %Loop]
+
+	%STRRED = getelementptr [10000 x int]* %P, int %outer, int %INDVAR
+	store int 0, int* %STRRED
+
+	%INDVAR2 = add int %INDVAR, 1
+	%cond = call bool %pred()
+	br bool %cond, label %Loop, label %Out
+Out:
+	ret void
+}