no-overflow-tracking.ll
3.1 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
; RUN: opt %loadPolly -analyze -polly-scops \
; RUN: -polly-invariant-load-hoisting=true < %s | FileCheck %s
; RUN: opt %loadPolly -S -polly-codegen -polly-overflow-tracking=never \
; RUN: -polly-invariant-load-hoisting=true < %s | FileCheck %s --check-prefix=IR
;
; As (p + q) can overflow we have to check that we load from
; I[p + q] only if it does not.
;
; CHECK: Invariant Accesses: {
; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 0]
; CHECK-NEXT: [N, p, q] -> { Stmt_for_body[i0] -> MemRef_I[p + q] };
; CHECK-NEXT: Execution Context: [N, p, q] -> { : N > 0 and -2147483648 - p <= q <= 2147483647 - p }
; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 0]
; CHECK-NEXT: [N, p, q] -> { Stmt_for_body[i0] -> MemRef_tmp1[0] };
; CHECK-NEXT: Execution Context: [N, p, q] -> { : N > 0 }
; CHECK-NEXT: }
;
; IR: polly.preload.merge:
; IR-NEXT: %polly.preload.tmp1.merge = phi i32* [ %polly.access.I.load, %polly.preload.exec ], [ null, %polly.preload.cond ]
; IR-NEXT: store i32* %polly.preload.tmp1.merge, i32** %tmp1.preload.s2a
; IR-NEXT: %12 = sext i32 %N to i64
; IR-NEXT: %13 = icmp sge i64 %12, 1
; IR-NEXT: %14 = sext i32 %q to i64
; IR-NEXT: %15 = sext i32 %p to i64
; IR-NEXT: %16 = add nsw i64 %15, %14
; IR-NEXT: %17 = icmp sle i64 %16, 2147483647
; IR-NEXT: %18 = and i1 %13, %17
; IR-NEXT: %19 = sext i32 %q to i64
; IR-NEXT: %20 = sext i32 %p to i64
; IR-NEXT: %21 = add nsw i64 %20, %19
; IR-NEXT: %22 = icmp sge i64 %21, -2147483648
; IR-NEXT: %23 = and i1 %18, %22
; IR-NEXT: br label %polly.preload.cond1
;
; IR: polly.preload.cond1:
; IR-NEXT: br i1 %23
;
; IR: polly.preload.exec3:
; IR-NEXT: %polly.access.polly.preload.tmp1.merge = getelementptr i32, i32* %polly.preload.tmp1.merge, i64 0
; IR-NEXT: %polly.access.polly.preload.tmp1.merge.load = load i32, i32* %polly.access.polly.preload.tmp1.merge, align 4
;
; void f(int **I, int *A, int N, int p, int q) {
; for (int i = 0; i < N; i++)
; A[i] = *(I[p + q]);
; }
;
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
define void @f(i32** %I, i32* %A, i32 %N, i32 %p, i32 %q) {
entry:
%tmp = sext i32 %N to i64
br label %for.cond
for.cond: ; preds = %for.inc, %entry
%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
%cmp = icmp slt i64 %indvars.iv, %tmp
br i1 %cmp, label %for.body, label %for.end
for.body: ; preds = %for.cond
%add = add i32 %p, %q
%idxprom = sext i32 %add to i64
%arrayidx = getelementptr inbounds i32*, i32** %I, i64 %idxprom
%tmp1 = load i32*, i32** %arrayidx, align 8
%tmp2 = load i32, i32* %tmp1, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
store i32 %tmp2, i32* %arrayidx2, align 4
br label %for.inc
for.inc: ; preds = %for.body
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
br label %for.cond
for.end: ; preds = %for.cond
ret void
}