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: llc < %s -mcpu=atom -mtriple=i686-linux | FileCheck %s
; CHECK: addl ({{%[a-z]+}},[[reg:%[a-z]+]],4)
; CHECK-NEXT: movl
; CHECK-NEXT: addl 4({{%[a-z]+}},[[reg:%[a-z]+]],4)
; CHECK-NEXT: incl
; Test for the FixupLEAs pre-emit pass.
; An LEA should NOT be substituted for the ADD instruction
; that increments the array pointer if it is greater than 5 instructions
; away from the memory reference that uses it.
; Original C code: clang -m32 -S -O2
;int test(int n, int * array, int * m, int * array2)
;{
; int i, j = 0;
; int sum = 0;
; for (i = 0, j = 0; i < n;) {
; ++i;
; *m += array2[j++];
; sum += array[i];
; }
; return sum;
;}
define i32 @test(i32 %n, i32* nocapture %array, i32* nocapture %k, i32* nocapture %l, i32* nocapture %m, i32* nocapture %array2) #0 {
entry:
%cmp7 = icmp sgt i32 %n, 0
br i1 %cmp7, label %for.body.lr.ph, label %for.end
for.body.lr.ph: ; preds = %entry
%.pre = load i32, i32* %m, align 4
br label %for.body
for.body: ; preds = %for.body, %for.body.lr.ph
%0 = phi i32 [ %.pre, %for.body.lr.ph ], [ %add, %for.body ]
%sum.010 = phi i32 [ 0, %for.body.lr.ph ], [ %add3, %for.body ]
%j.09 = phi i32 [ 0, %for.body.lr.ph ], [ %inc1, %for.body ]
%inc1 = add nsw i32 %j.09, 1
%arrayidx = getelementptr inbounds i32, i32* %array2, i32 %j.09
store i32 %0, i32* %m, align 4
store i32 %sum.010, i32* %m, align 4
store i32 %0, i32* %m, align 4
%1 = load i32, i32* %arrayidx, align 4
%add = add nsw i32 %0, %1
store i32 %add, i32* %m, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %array, i32 %inc1
%2 = load i32, i32* %arrayidx2, align 4
%add3 = add nsw i32 %2, %sum.010
%exitcond = icmp eq i32 %inc1, %n
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
%sum.0.lcssa = phi i32 [ 0, %entry ], [ %add3, %for.body ]
ret i32 %sum.0.lcssa
}
|