1 ; RUN: opt < %s -debug-only=loop-vectorize -loop-vectorize -vectorizer-maximize-bandwidth -O2 -S 2>&1 | FileCheck %s
4 target 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-S128"
5 target triple = "x86_64-unknown-linux-gnu"
7 @a = global [1024 x i8] zeroinitializer, align 16
8 @b = global [1024 x i8] zeroinitializer, align 16
11 ; This function has a loop of SAD pattern. Here we check when VF = 16 the
12 ; register usage doesn't exceed 16.
15 ; CHECK: LV(REG): VF = 4
16 ; CHECK-NEXT: LV(REG): Found max usage: 4
17 ; CHECK: LV(REG): VF = 8
18 ; CHECK-NEXT: LV(REG): Found max usage: 7
19 ; CHECK: LV(REG): VF = 16
20 ; CHECK-NEXT: LV(REG): Found max usage: 13
26 %add.lcssa = phi i32 [ %add, %for.body ]
30 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
31 %s.015 = phi i32 [ 0, %entry ], [ %add, %for.body ]
32 %arrayidx = getelementptr inbounds [1024 x i8], [1024 x i8]* @a, i64 0, i64 %indvars.iv
33 %0 = load i8, i8* %arrayidx, align 1
34 %conv = zext i8 %0 to i32
35 %arrayidx2 = getelementptr inbounds [1024 x i8], [1024 x i8]* @b, i64 0, i64 %indvars.iv
36 %1 = load i8, i8* %arrayidx2, align 1
37 %conv3 = zext i8 %1 to i32
38 %sub = sub nsw i32 %conv, %conv3
39 %ispos = icmp sgt i32 %sub, -1
40 %neg = sub nsw i32 0, %sub
41 %2 = select i1 %ispos, i32 %sub, i32 %neg
42 %add = add nsw i32 %2, %s.015
43 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
44 %exitcond = icmp eq i64 %indvars.iv.next, 1024
45 br i1 %exitcond, label %for.cond.cleanup, label %for.body
48 define i64 @bar(i64* nocapture %a) {
50 ; CHECK: LV(REG): VF = 2
51 ; CHECK: LV(REG): Found max usage: 4
57 %add2.lcssa = phi i64 [ %add2, %for.body ]
61 %i.012 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
62 %s.011 = phi i64 [ 0, %entry ], [ %add2, %for.body ]
63 %arrayidx = getelementptr inbounds i64, i64* %a, i64 %i.012
64 %0 = load i64, i64* %arrayidx, align 8
65 %add = add nsw i64 %0, %i.012
66 store i64 %add, i64* %arrayidx, align 8
67 %add2 = add nsw i64 %add, %s.011
68 %inc = add nuw nsw i64 %i.012, 1
69 %exitcond = icmp eq i64 %inc, 1024
70 br i1 %exitcond, label %for.cond.cleanup, label %for.body