Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

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

@@ -0,0 +1,22 @@
+; Don't reduce the byte access to P[i], at least not on targets that 
+; support an efficient 'mem[r1+r2]' addressing mode.
+
+; RUN: opt < %s -loop-reduce -disable-output
+
+
+declare i1 @pred(i32)
+
+define void @test(i8* %PTR) {
+; <label>:0
+	br label %Loop
+Loop:		; preds = %Loop, %0
+	%INDVAR = phi i32 [ 0, %0 ], [ %INDVAR2, %Loop ]		; <i32> [#uses=2]
+	%STRRED = getelementptr i8, i8* %PTR, i32 %INDVAR		; <i8*> [#uses=1]
+	store i8 0, i8* %STRRED
+	%INDVAR2 = add i32 %INDVAR, 1		; <i32> [#uses=2]
+        ;; cannot eliminate indvar
+	%cond = call i1 @pred( i32 %INDVAR2 )		; <i1> [#uses=1]
+	br i1 %cond, label %Loop, label %Out
+Out:		; preds = %Loop
+	ret void
+}