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Add a testcase to loop-idiom to cover PR14241 when we start handling

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strided loops again.

llvm-svn: 167287
This commit is contained in:
Chandler Carruth 2012-11-02 08:40:24 +00:00
parent 1fc186f3bd
commit ca6ce473f5
1 changed files with 33 additions and 0 deletions
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33
test/Transforms/LoopIdiom/basic.ll
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@ -383,4 +383,37 @@ for.end: ; preds = %for.inc
}
define void @PR14241(i32* %s, i64 %size) {
; 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: @PR14241
entry:
%end.idx = add i64 %size, -1
%end.ptr = getelementptr inbounds i32* %s, i64 %end.idx
br label %while.body
; CHECK-NOT: memcpy
;
; FIXME: When we regain the ability to form a memmove here, this test should be
; reversed and turned into a positive assertion.
; CHECK-NOT: memmove
while.body:
%phi.ptr = phi i32* [ %s, %entry ], [ %next.ptr, %while.body ]
%src.ptr = getelementptr inbounds i32* %phi.ptr, i64 1
%val = load i32* %src.ptr, align 4
; CHECK: load
%dst.ptr = getelementptr inbounds i32* %phi.ptr, i64 0
store i32 %val, i32* %dst.ptr, align 4
; CHECK: store
%next.ptr = getelementptr inbounds i32* %phi.ptr, i64 1
%cmp = icmp eq i32* %next.ptr, %end.ptr
br i1 %cmp, label %exit, label %while.body
exit:
ret void
; CHECK: ret void
}