Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/Transforms/IndVarSimplify/masked-iv.ll

@@ -0,0 +1,28 @@
+; RUN: opt < %s -indvars -S | FileCheck %s
+
+; Indvars should do the IV arithmetic in the canonical IV type (i64),
+; and only use one truncation.
+
+define void @foo(i64* %A, i64* %B, i64 %n, i64 %a, i64 %s) nounwind {
+; CHECK-LABEL: @foo(
+; CHECK-NOT: trunc
+; CHECK: and
+; CHECK-NOT: and
+entry:
+	%t0 = icmp sgt i64 %n, 0		; <i1> [#uses=1]
+	br i1 %t0, label %bb.preheader, label %return
+
+bb.preheader:		; preds = %entry
+	br label %bb
+
+bb:		; preds = %bb, %bb.preheader
+	%i.01 = phi i64 [ %t6, %bb ], [ %a, %bb.preheader ]		; <i64> [#uses=3]
+	%t1 = and i64 %i.01, 255		; <i64> [#uses=1]
+	%t2 = getelementptr i64, i64* %A, i64 %t1		; <i64*> [#uses=1]
+	store i64 %i.01, i64* %t2, align 8
+	%t6 = add i64 %i.01, %s		; <i64> [#uses=1]
+	br label %bb
+
+return:		; preds = %entry
+	ret void
+}