1; RUN: opt < %s -instcombine -S > %t
2; RUN: not grep lshr %t
3; RUN: grep add %t | count 1
4
5; Instcombine should be able to eliminate the lshr, because only
6; bits in the operand which might be non-zero will be shifted
7; off the end.
8
9define i32 @hash_string(i8* nocapture %key) nounwind readonly {
10entry:
11	%t0 = load i8, i8* %key, align 1		; <i8> [#uses=1]
12	%t1 = icmp eq i8 %t0, 0		; <i1> [#uses=1]
13	br i1 %t1, label %bb2, label %bb
14
15bb:		; preds = %bb, %entry
16	%indvar = phi i64 [ 0, %entry ], [ %tmp, %bb ]		; <i64> [#uses=2]
17	%k.04 = phi i32 [ 0, %entry ], [ %t8, %bb ]		; <i32> [#uses=2]
18	%cp.05 = getelementptr i8, i8* %key, i64 %indvar		; <i8*> [#uses=1]
19	%t2 = shl i32 %k.04, 1		; <i32> [#uses=1]
20	%t3 = lshr i32 %k.04, 14		; <i32> [#uses=1]
21	%t4 = add i32 %t2, %t3		; <i32> [#uses=1]
22	%t5 = load i8, i8* %cp.05, align 1		; <i8> [#uses=1]
23	%t6 = sext i8 %t5 to i32		; <i32> [#uses=1]
24	%t7 = xor i32 %t6, %t4		; <i32> [#uses=1]
25	%t8 = and i32 %t7, 16383		; <i32> [#uses=2]
26	%tmp = add i64 %indvar, 1		; <i64> [#uses=2]
27	%scevgep = getelementptr i8, i8* %key, i64 %tmp		; <i8*> [#uses=1]
28	%t9 = load i8, i8* %scevgep, align 1		; <i8> [#uses=1]
29	%t10 = icmp eq i8 %t9, 0		; <i1> [#uses=1]
30	br i1 %t10, label %bb2, label %bb
31
32bb2:		; preds = %bb, %entry
33	%k.0.lcssa = phi i32 [ 0, %entry ], [ %t8, %bb ]		; <i32> [#uses=1]
34	ret i32 %k.0.lcssa
35}
36