Imported Upstream version 5.18.0.161

Former-commit-id: 4db48158d3a35497b8f118ab21b5f08ac3d86d98

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

@@ -0,0 +1,21 @@
+; Check that variable strides are reduced to adds instead of multiplies.
+; RUN: opt < %s -loop-reduce -S | not grep mul
+
+; Provide legal integer types.
+target datalayout = "n8:16:32:64"
+
+declare i1 @pred(i32)
+
+define void @test([10000 x i32]* %P, i32 %STRIDE) {
+; <label>:0
+	br label %Loop
+Loop:		; preds = %Loop, %0
+	%INDVAR = phi i32 [ 0, %0 ], [ %INDVAR2, %Loop ]		; <i32> [#uses=2]
+	%Idx = mul i32 %INDVAR, %STRIDE		; <i32> [#uses=1]
+	%cond = call i1 @pred( i32 %Idx )		; <i1> [#uses=1]
+	%INDVAR2 = add i32 %INDVAR, 1		; <i32> [#uses=1]
+	br i1 %cond, label %Loop, label %Out
+Out:		; preds = %Loop
+	ret void
+}
+