; RUN: opt < %s -instcombine -S | not grep sext
; XFAIL: *
; rdar://6598839

define zeroext i16 @t(i8 zeroext %on_off, i16* nocapture %puls) nounwind readonly {
entry:
	%0 = zext i8 %on_off to i32
	%1 = add i32 %0, -1
	%2 = sext i32 %1 to i64
	%3 = getelementptr i16* %puls, i64 %2
	%4 = load i16* %3, align 2
	ret i16 %4
}

define zeroext i64 @t2(i8 zeroext %on_off) nounwind readonly {
entry:
	%0 = zext i8 %on_off to i32
	%1 = add i32 %0, -1
	%2 = sext i32 %1 to i64
	ret i64 %2  ;; Should be (add (zext i8 -> i64), -1)
}