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 ; Though @unknown_global is initialized with constant values, we can't consider
5 ; it as a constant, so we shouldn't unroll the loop.
6 ; CHECK: %array_const_idx = getelementptr inbounds [9 x i32], [9 x i32]* @unknown_global, i64 0, i64 %iv
7 @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
9 define i32 @foo(i32* noalias nocapture readonly %src) {
13 loop: ; preds = %loop, %entry
14 %iv = phi i64 [ 0, %entry ], [ %inc, %loop ]
15 %r = phi i32 [ 0, %entry ], [ %add, %loop ]
16 %arrayidx = getelementptr inbounds i32, i32* %src, i64 %iv
17 %src_element = load i32, i32* %arrayidx, align 4
18 %array_const_idx = getelementptr inbounds [9 x i32], [9 x i32]* @unknown_global, i64 0, i64 %iv
19 %const_array_element = load i32, i32* %array_const_idx, align 4
20 %mul = mul nsw i32 %src_element, %const_array_element
21 %add = add nsw i32 %mul, %r
22 %inc = add nuw nsw i64 %iv, 1
23 %exitcond86.i = icmp eq i64 %inc, 9
24 br i1 %exitcond86.i, label %loop.end, label %loop
26 loop.end: ; preds = %loop
27 %r.lcssa = phi i32 [ %r, %loop ]