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
|
; RUN: opt < %s -passes=loop-vectorize -prefer-predicate-over-epilogue=predicate-dont-vectorize -force-vector-width=4 -S | FileCheck %s
; Check that a counting-down loop which has no primary induction variable
; is vectorized with preferred predication.
; CHECK-LABEL: vector.body:
; CHECK-LABEL: middle.block:
; CHECK-NEXT: br i1 true,
target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
define dso_local void @foo(ptr noalias nocapture readonly %A, ptr noalias nocapture readonly %B, ptr noalias nocapture %C, i32 %N) {
entry:
%cmp6 = icmp eq i32 %N, 0
br i1 %cmp6, label %while.end, label %while.body.preheader
while.body.preheader:
br label %while.body
while.body:
%N.addr.010 = phi i32 [ %dec, %while.body ], [ %N, %while.body.preheader ]
%C.addr.09 = phi ptr [ %incdec.ptr4, %while.body ], [ %C, %while.body.preheader ]
%B.addr.08 = phi ptr [ %incdec.ptr1, %while.body ], [ %B, %while.body.preheader ]
%A.addr.07 = phi ptr [ %incdec.ptr, %while.body ], [ %A, %while.body.preheader ]
%incdec.ptr = getelementptr inbounds i8, ptr %A.addr.07, i32 1
%0 = load i8, ptr %A.addr.07, align 1
%incdec.ptr1 = getelementptr inbounds i8, ptr %B.addr.08, i32 1
%1 = load i8, ptr %B.addr.08, align 1
%add = add i8 %1, %0
%incdec.ptr4 = getelementptr inbounds i8, ptr %C.addr.09, i32 1
store i8 %add, ptr %C.addr.09, align 1
%dec = add i32 %N.addr.010, -1
%cmp = icmp eq i32 %dec, 0
br i1 %cmp, label %while.end.loopexit, label %while.body
while.end.loopexit:
br label %while.end
while.end:
ret void
}
; Make sure a loop is successfully vectorized with fold-tail when the backedge
; taken count is constant and used inside the loop. Issue revealed by D76992.
;
define void @reuse_const_btc(ptr %A) optsize {
; CHECK-LABEL: @reuse_const_btc
; CHECK: {{%.*}} = icmp ule <4 x i32> {{%.*}}, <i32 13, i32 13, i32 13, i32 13>
; CHECK: {{%.*}} = select <4 x i1> {{%.*}}, <4 x i32> <i32 12, i32 12, i32 12, i32 12>, <4 x i32> <i32 13, i32 13, i32 13, i32 13>
;
entry:
br label %loop
loop:
%riv = phi i32 [ 13, %entry ], [ %rivMinus1, %merge ]
%sub = sub nuw nsw i32 20, %riv
%arrayidx = getelementptr inbounds i8, ptr %A, i32 %sub
%cond0 = icmp eq i32 %riv, 7
br i1 %cond0, label %then, label %else
then:
br label %merge
else:
br label %merge
merge:
%blend = phi i32 [ 13, %then ], [ 12, %else ]
%trunc = trunc i32 %blend to i8
store i8 %trunc, ptr %arrayidx, align 1
%rivMinus1 = add nuw nsw i32 %riv, -1
%cond = icmp eq i32 %riv, 0
br i1 %cond, label %exit, label %loop
exit:
ret void
}
|
