File: masked-iv.ll

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; RUN: opt < %s -indvars -S > %t
; RUN: not grep trunc %t
; RUN: grep and %t | count 1

; 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 {
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* %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
}