• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1; RUN: opt -loop-vectorize -force-vector-width=4 -S < %s | FileCheck %s
2
3; This is the test case from PR26314.
4; When we were retrying dependence checking with memchecks only,
5; the loop-invariant access in the inner loop was incorrectly determined to be wrapping
6; because it was not strided in the inner loop.
7; Improved wrapping detection allows vectorization in the following case.
8
9; #define Z 32
10; typedef struct s {
11;       int v1[Z];
12;       int v2[Z];
13;       int v3[Z][Z];
14; } s;
15;
16; void slow_function (s* const obj) {
17;    for (int j=0; j<Z; j++) {
18;        for (int k=0; k<Z; k++) {
19;            int x = obj->v1[k] + obj->v2[j];
20;            obj->v3[j][k] += x;
21;        }
22;    }
23; }
24
25; CHECK-LABEL: Test
26; CHECK: <4 x i64>
27; CHECK: <4 x i32>, <4 x i32>
28; CHECK: llvm.loop.vectorize.width
29
30target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
31target triple = "x86_64-unknown-linux-gnu"
32
33%struct.s = type { [32 x i32], [32 x i32], [32 x [32 x i32]] }
34
35define void @Test(%struct.s* nocapture %obj) #0 {
36  br label %.outer.preheader
37
38
39.outer.preheader:
40  %i = phi i64 [ 0, %0 ], [ %i.next, %.outer ]
41  %1 = getelementptr inbounds %struct.s, %struct.s* %obj, i64 0, i32 1, i64 %i
42  br label %.inner
43
44.exit:
45  ret void
46
47.outer:
48  %i.next = add nuw nsw i64 %i, 1
49  %exitcond.outer = icmp eq i64 %i.next, 32
50  br i1 %exitcond.outer, label %.exit, label %.outer.preheader
51
52.inner:
53  %j = phi i64 [ 0, %.outer.preheader ], [ %j.next, %.inner ]
54  %2 = getelementptr inbounds %struct.s, %struct.s* %obj, i64 0, i32 0, i64 %j
55  %3 = load i32, i32* %2
56  %4 = load i32, i32* %1
57  %5 = add nsw i32 %4, %3
58  %6 = getelementptr inbounds %struct.s, %struct.s* %obj, i64 0, i32 2, i64 %i, i64 %j
59  %7 = load i32, i32* %6
60  %8 = add nsw i32 %5, %7
61  store i32 %8, i32* %6
62  %j.next = add nuw nsw i64 %j, 1
63  %exitcond.inner = icmp eq i64 %j.next, 32
64  br i1 %exitcond.inner, label %.outer, label %.inner
65}
66