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
76
77
78
79
80
81
82
83
84
85
86
|
; RUN: opt %loadPolly -polly-print-scops -disable-output < %s | FileCheck %s
;
; This checks that the no-wraps checks will be computed fast as some example
; already showed huge slowdowns even though the inbounds and nsw flags were
; all in place.
;
; // Inspired by itrans8x8 in transform8x8.c from the ldecode benchmark.
; void fast(char *A, char N, char M) {
; for (char i = 0; i < 8; i++) {
; char index0 = i + N;
; char index1 = index0 * 16;
; char index2 = index1 + M;
; A[(short)index2]++;
; }
; }
;
; void slow(char *A, char N, char M) {
; for (char i = 0; i < 8; i++) {
; char index0 = i + N;
; char index1 = index0 * 16;
; short index2 = ((short)index1) + ((short)M);
; A[index2]++;
; }
; }
;
; CHECK: Function: fast
; CHECK: Function: slow
;
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
define void @fast(ptr %A, i8 %N, i8 %M) {
entry:
br label %for.cond
for.cond: ; preds = %for.inc, %entry
%indvars.iv = phi i8 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
%exitcond = icmp ne i8 %indvars.iv, 8
br i1 %exitcond, label %for.body, label %for.end
for.body: ; preds = %for.cond
%tmp3 = add nsw i8 %indvars.iv, %N
%mul = mul nsw i8 %tmp3, 16
%add2 = add nsw i8 %mul, %M
%add2ext = sext i8 %add2 to i16
%arrayidx = getelementptr inbounds i8, ptr %A, i16 %add2ext
%tmp4 = load i8, ptr %arrayidx, align 4
%inc = add nsw i8 %tmp4, 1
store i8 %inc, ptr %arrayidx, align 4
br label %for.inc
for.inc: ; preds = %for.body
%indvars.iv.next = add nuw nsw i8 %indvars.iv, 1
br label %for.cond
for.end: ; preds = %for.cond
ret void
}
define void @slow(ptr %A, i8 %N, i8 %M) {
entry:
br label %for.cond
for.cond: ; preds = %for.inc, %entry
%indvars.iv = phi i8 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
%exitcond = icmp ne i8 %indvars.iv, 8
br i1 %exitcond, label %for.body, label %for.end
for.body: ; preds = %for.cond
%tmp3 = add nsw i8 %indvars.iv, %N
%mul = mul nsw i8 %tmp3, 16
%mulext = sext i8 %mul to i16
%Mext = sext i8 %M to i16
%add2 = add nsw i16 %mulext, %Mext
%arrayidx = getelementptr inbounds i8, ptr %A, i16 %add2
%tmp4 = load i8, ptr %arrayidx, align 4
%inc = add nsw i8 %tmp4, 1
store i8 %inc, ptr %arrayidx, align 4
br label %for.inc
for.inc: ; preds = %for.body
%indvars.iv.next = add nuw nsw i8 %indvars.iv, 1
br label %for.cond
for.end: ; preds = %for.cond
ret void
}
|
