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
|
; RUN: opt -passes=loop-load-elim -S < %s | FileCheck %s
; The accesses to A are independent here but LAA reports it as a loop-carried
; forward dependence. Check that we don't perform st->ld forwarding between
; them.
;
; for (unsigned i = 0; i < 100; i++) {
; A[i][1] = B[i] + 2;
; C[i] = A[i][0] * 2;
; }
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
define void @f(ptr noalias %A, ptr noalias %B, ptr noalias %C, i64 %N) {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%A1idx = getelementptr inbounds [2 x i32], ptr %A, i64 %indvars.iv, i32 1
%Bidx = getelementptr inbounds i32, ptr %B, i64 %indvars.iv
%Cidx = getelementptr inbounds i32, ptr %C, i64 %indvars.iv
%A0idx = getelementptr inbounds [2 x i32], ptr %A, i64 %indvars.iv, i32 0
%b = load i32, ptr %Bidx, align 4
%a_p1 = add i32 %b, 2
store i32 %a_p1, ptr %A1idx, align 4
; CHECK: %a = load i32, ptr %A0idx, align 4
%a = load i32, ptr %A0idx, align 4
; CHECK: %c = mul i32 %a, 2
%c = mul i32 %a, 2
store i32 %c, ptr %Cidx, align 4
%exitcond = icmp eq i64 %indvars.iv.next, %N
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
|
