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
|
; RUN: opt %loadPolly -polly-print-optree -disable-output < %s | FileCheck %s -match-full-lines
;
; Rematerialize a load in the presence of a non-store WRITE access.
;
; for (int j = 0; j < n; j += 1) {
; bodyA:
; double val = B[j];
;
; bodyB:
; A[j] = val;
;
; bodyC:
; memset(A, 0, 16);
; memset(B, 0, 16);
; }
;
declare void @llvm.memset.p0.i64(ptr nocapture, i8, i64, i32, i1)
define void @func(i32 %n, ptr noalias nonnull %A, ptr noalias nonnull %B) {
entry:
br label %for
for:
%j = phi i32 [0, %entry], [%j.inc, %inc]
%j.cmp = icmp slt i32 %j, %n
br i1 %j.cmp, label %bodyA, label %exit
bodyA:
%B_idx = getelementptr inbounds double, ptr %B, i32 %j
%val = load double, ptr %B_idx
br label %bodyB
bodyB:
%A_idx = getelementptr inbounds double, ptr %A, i32 %j
store double %val, ptr %A_idx
br label %bodyC
bodyC:
call void @llvm.memset.p0.i64(ptr %A, i8 0, i64 16, i32 1, i1 false)
call void @llvm.memset.p0.i64(ptr %B, i8 0, i64 16, i32 1, i1 false)
br label %inc
inc:
%j.inc = add nuw nsw i32 %j, 1
br label %for
exit:
br label %return
return:
ret void
}
; CHECK: Statistics {
; CHECK: Known loads forwarded: 1
; CHECK: Operand trees forwarded: 1
; CHECK: Statements with forwarded operand trees: 1
; CHECK: }
|
