forward_load_double_write.ll
1.75 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
; RUN: opt %loadPolly -polly-stmt-granularity=bb -polly-optree -analyze < %s | FileCheck %s -match-full-lines
;
; Rematerialize a load even in case two writes of identical values are in
; one scop statement.
;
define void @func(i32 %n, double* noalias nonnull %A, double* 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, double* %B, i32 %j
%val = load double, double* %B_idx
br label %bodyB
bodyB:
%A_idx = getelementptr inbounds double, double* %A, i32 %j
store double %val, double* %A_idx
store double %val, double* %A_idx
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: }
; CHECK: Stmt_bodyB
; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 0]
; CHECK-NEXT: ;
; CHECK-NEXT: new: [n] -> { Stmt_bodyB[i0] -> MemRef_B[i0] };
; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 0]
; CHECK-NEXT: [n] -> { Stmt_bodyB[i0] -> MemRef_A[i0] };
; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 0]
; CHECK-NEXT: [n] -> { Stmt_bodyB[i0] -> MemRef_A[i0] };
; CHECK-NEXT: Instructions {
; CHECK-NEXT: %val = load double, double* %B_idx, align 8
; CHECK-NEXT: store double %val, double* %A_idx, align 8
; CHECK-NEXT: store double %val, double* %A_idx, align 8
; CHECK-NEXT: }