1; RUN: opt < %s -S -loop-unroll -unroll-threshold=150 | FileCheck %s
2;
3; Verify that trunc i64 to i32 is considered free by loop unrolling
4; heuristics when i32 is a native type.
5; This should result in full unrolling this loop with size=7, TC=19.
6; If the trunc were not free we would have 8*19=152 > 150.
7
8target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
9
10; Check that for.body was unrolled 19 times.
11; CHECK-LABEL: @test(
12; CHECK: %0 = load
13; CHECK: %conv = sext i8 %0 to i32
14; CHECK: %add.1 = add nsw i32 %conv.1, %conv
15; CHECK: %add.18 = add nsw i32 %conv.18, %add.17
16; CHECK: ret i32 %add.18
17define i32 @test(i8* %arr) nounwind uwtable readnone {
18entry:
19  br label %for.body
20
21for.body:                                         ; preds = %for.body, %entry
22  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
23  %sum.02 = phi i32 [ 0, %entry ], [ %add, %for.body ]
24  %arrayidx = getelementptr inbounds i8* %arr, i64 %indvars.iv
25  %0 = load i8* %arrayidx, align 1
26  %conv = sext i8 %0 to i32
27  %add = add nsw i32 %conv, %sum.02
28  %indvars.iv.next = add i64 %indvars.iv, 1
29  %lftr.wideiv1 = trunc i64 %indvars.iv.next to i32
30  %exitcond2 = icmp eq i32 %lftr.wideiv1, 19
31  br i1 %exitcond2, label %for.end, label %for.body
32
33for.end:                                          ; preds = %for.body
34  %add.lcssa = phi i32 [ %add, %for.body ]
35  ret i32 %add.lcssa
36}
37