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
|
; RUN: opt -hexagon-loop-idiom -S -mtriple hexagon-unknown-elf < %s \
; RUN: | FileCheck %s
; RUN: opt -p hexagon-loop-idiom -S -mtriple hexagon-unknown-elf < %s \
; RUN: | FileCheck %s
define void @PR14241(ptr %s, i64 %size) #0 {
; Ensure that we don't form a memcpy for strided loops. Briefly, when we taught
; LoopIdiom about memmove and strided loops, this got miscompiled into a memcpy
; instead of a memmove. If we get the memmove transform back, this will catch
; regressions.
;
; CHECK-LABEL: @PR14241(
entry:
%end.idx = add i64 %size, -1
%end.ptr = getelementptr inbounds i32, ptr %s, i64 %end.idx
br label %while.body
; CHECK-NOT: memcpy
; CHECK: memmove
while.body:
%phi.ptr = phi ptr [ %s, %entry ], [ %next.ptr, %while.body ]
%src.ptr = getelementptr inbounds i32, ptr %phi.ptr, i64 1
%val = load i32, ptr %src.ptr, align 4
; CHECK: load
store i32 %val, ptr %phi.ptr, align 4
; CHECK: store
%next.ptr = getelementptr inbounds i32, ptr %phi.ptr, i64 1
%cmp = icmp eq ptr %next.ptr, %end.ptr
br i1 %cmp, label %exit, label %while.body
exit:
ret void
; CHECK: ret void
}
attributes #0 = { nounwind }
|
