1 ; RUN: opt < %s -S -loop-unroll -unroll-max-iteration-count-to-analyze=1000 -unroll-threshold=10 -unroll-percent-dynamic-cost-saved-threshold=50 -unroll-dynamic-cost-savings-discount=90 | FileCheck %s
2 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
4 @unknown_global = internal unnamed_addr global [9 x i32] [i32 0, i32 -1, i32 0, i32 -1, i32 5, i32 -1, i32 0, i32 -1, i32 0], align 16
5 @weak_constant = weak unnamed_addr constant [9 x i32] [i32 0, i32 -1, i32 0, i32 -1, i32 5, i32 -1, i32 0, i32 -1, i32 0], align 16
7 ; Though @unknown_global is initialized with constant values, we can't consider
8 ; it as a constant, so we shouldn't unroll the loop.
10 ; CHECK: %array_const_idx = getelementptr inbounds [9 x i32], [9 x i32]* @unknown_global, i64 0, i64 %iv
11 define i32 @foo(i32* noalias nocapture readonly %src) {
15 loop: ; preds = %loop, %entry
16 %iv = phi i64 [ 0, %entry ], [ %inc, %loop ]
17 %r = phi i32 [ 0, %entry ], [ %add, %loop ]
18 %arrayidx = getelementptr inbounds i32, i32* %src, i64 %iv
19 %src_element = load i32, i32* %arrayidx, align 4
20 %array_const_idx = getelementptr inbounds [9 x i32], [9 x i32]* @unknown_global, i64 0, i64 %iv
21 %const_array_element = load i32, i32* %array_const_idx, align 4
22 %mul = mul nsw i32 %src_element, %const_array_element
23 %add = add nsw i32 %mul, %r
24 %inc = add nuw nsw i64 %iv, 1
25 %exitcond86.i = icmp eq i64 %inc, 9
26 br i1 %exitcond86.i, label %loop.end, label %loop
28 loop.end: ; preds = %loop
29 %r.lcssa = phi i32 [ %r, %loop ]
33 ; Similarly, we can't consider 'weak' symbols as a known constant value, so we
34 ; shouldn't unroll the loop.
36 ; CHECK: %array_const_idx = getelementptr inbounds [9 x i32], [9 x i32]* @weak_constant, i64 0, i64 %iv
37 define i32 @foo2(i32* noalias nocapture readonly %src) {
41 loop: ; preds = %loop, %entry
42 %iv = phi i64 [ 0, %entry ], [ %inc, %loop ]
43 %r = phi i32 [ 0, %entry ], [ %add, %loop ]
44 %arrayidx = getelementptr inbounds i32, i32* %src, i64 %iv
45 %src_element = load i32, i32* %arrayidx, align 4
46 %array_const_idx = getelementptr inbounds [9 x i32], [9 x i32]* @weak_constant, i64 0, i64 %iv
47 %const_array_element = load i32, i32* %array_const_idx, align 4
48 %mul = mul nsw i32 %src_element, %const_array_element
49 %add = add nsw i32 %mul, %r
50 %inc = add nuw nsw i64 %iv, 1
51 %exitcond86.i = icmp eq i64 %inc, 9
52 br i1 %exitcond86.i, label %loop.end, label %loop
54 loop.end: ; preds = %loop
55 %r.lcssa = phi i32 [ %r, %loop ]