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
|
; RUN: opt < %s -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -dce -instcombine -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; The parallel loop has been invalidated by the new memory accesses introduced
; by reg2mem (Loop::isParallel() starts to return false). Ensure the loop is
; now non-vectorizable.
;CHECK-NOT: <4 x i32>
define void @parallel_loop(i32* nocapture %a, i32* nocapture %b) nounwind uwtable {
entry:
%indvars.iv.next.reg2mem = alloca i64
%indvars.iv.reg2mem = alloca i64
%"reg2mem alloca point" = bitcast i32 0 to i32
store i64 0, i64* %indvars.iv.reg2mem
br label %for.body
for.body: ; preds = %for.body.for.body_crit_edge, %entry
%indvars.iv.reload = load i64, i64* %indvars.iv.reg2mem
%arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.reload
%0 = load i32, i32* %arrayidx, align 4, !llvm.mem.parallel_loop_access !3
%arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %indvars.iv.reload
%1 = load i32, i32* %arrayidx2, align 4, !llvm.mem.parallel_loop_access !3
%idxprom3 = sext i32 %1 to i64
%arrayidx4 = getelementptr inbounds i32, i32* %a, i64 %idxprom3
store i32 %0, i32* %arrayidx4, align 4, !llvm.mem.parallel_loop_access !3
%indvars.iv.next = add i64 %indvars.iv.reload, 1
; A new store without the parallel metadata here:
store i64 %indvars.iv.next, i64* %indvars.iv.next.reg2mem
%indvars.iv.next.reload1 = load i64, i64* %indvars.iv.next.reg2mem
%arrayidx6 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.next.reload1
%2 = load i32, i32* %arrayidx6, align 4, !llvm.mem.parallel_loop_access !3
store i32 %2, i32* %arrayidx2, align 4, !llvm.mem.parallel_loop_access !3
%indvars.iv.next.reload = load i64, i64* %indvars.iv.next.reg2mem
%lftr.wideiv = trunc i64 %indvars.iv.next.reload to i32
%exitcond = icmp eq i32 %lftr.wideiv, 512
br i1 %exitcond, label %for.end, label %for.body.for.body_crit_edge, !llvm.loop !3
for.body.for.body_crit_edge: ; preds = %for.body
%indvars.iv.next.reload2 = load i64, i64* %indvars.iv.next.reg2mem
store i64 %indvars.iv.next.reload2, i64* %indvars.iv.reg2mem
br label %for.body
for.end: ; preds = %for.body
ret void
}
!3 = !{!3}
|
