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<p><br>
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<div class="moz-cite-prefix">On 3/12/21 4:45 PM, Jordan Rupprecht
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABC7LbT4VX8VbFGCqse0Bg6e85=FSc06RMxC05RJxhJhK2=okQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div dir="ltr"><br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Mar 12, 2021 at 6:24
PM Philip Reames <<a
href="mailto:listmail@philipreames.com"
moz-do-not-send="true">listmail@philipreames.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<p><br>
</p>
<div>On 3/12/21 3:35 PM, Philip Reames via llvm-commits
wrote:<br>
</div>
<blockquote type="cite">
<p><br>
</p>
<div>On 3/12/21 3:22 PM, Philip Reames via llvm-commits
wrote:<br>
</div>
<blockquote type="cite">
<p><br>
</p>
<div>On 3/12/21 2:59 PM, Jordan Rupprecht wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr"><br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Mar
12, 2021 at 4:29 PM Philip Reames <<a
href="mailto:listmail@philipreames.com"
target="_blank" moz-do-not-send="true">listmail@philipreames.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<p>Jordan,</p>
<p>Please revert this change.</p>
<p>There's a couple of problems here:</p>
<ul>
<li>The change reverted looks obviously
innocent. (e.g. it's bailing out of a
transform slightly more often)</li>
</ul>
</div>
</blockquote>
<div>I don't disagree that it "looks obviously
innocent", but the proof is in the pudding:
the reproducer I posted compiles ~instantly at
one commit prior, and times out at the culprit
commit. A change "looking" good should never
be a basis for saying it must be correct and
should not be reverted, especially when there
is evidence it is a problem. At least, that's
my personal opinion, but I should think that's
a fairly basic and widely held belief.</div>
</div>
</div>
</blockquote>
<p>You're correct, but missing the point I was getting
at. Admittedly, poorly worded. <br>
</p>
<p>While looking obviously innocent isn't reason not
to revert itself, it's definitely reason to take a
slightly closer look and make sure there's nothing
else going on. This is particularly relevant given
the other points in this discussion.<br>
</p>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_quote">
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<ul>
<li>The change reverted was itself fixing
a functional bug. At a minimum, we'd
need a larger revert to get ToT back to
a sane state.</li>
</ul>
</div>
</blockquote>
<div>The fix is introducing a different bug, and
one which seems more widespread. At the very
least, we haven't observed any of the crashes
mentioned in PR49466, but we did notice a
compile timeout in several different
compilation units.</div>
</div>
</div>
</blockquote>
<p>Bug? Discussion? Response to original commit?</p>
<p>Your observation may be true *for you*. It is not
necessarily true for anyone else, and you bear the
burden of making the case. Particularly when
reverting a functional fix.<br>
</p>
<p>To be clear, I'm not saying you're wrong. I'm
saying you haven't given anyone else enough
information to tell if you are or not. <br>
</p>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_quote">
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<ul>
<li>It is generally considered reasonable
to provide a test case and wait a bit
before reverting, at least once the
patch is more than a few hours old.</li>
</ul>
</div>
</blockquote>
<div>Sorry about that. I'll concede that I got a
little trigger happy here, but I was hoping
that would be waived by the fact that I gave a
simple, concrete reproducer. <br>
</div>
</div>
</div>
</blockquote>
Thanks for the acknowledgement. To be fair, it would
have been less of an issue if the reproducer worked
straight forwardly.<br>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_quote">
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<ul>
<li>Failure to provide an IR test case.</li>
</ul>
</div>
</blockquote>
<div>(ditto, but see one below) </div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<ul>
<li>Your test case does not reproduce. Or
at least, it doesn't reproduce when
compiled with clang10 to IR and then run
through (very recent, but without your
change) ToT opt -O2. If there's
something specific about the interaction
of clang and opt ToT, reducing this down
to a IR test case becomes particularly
important.</li>
</ul>
</div>
</blockquote>
<div>This comment is going *way* off track --
the reproducer I posted *does* reproduce, at
least for me, in the configuration I posted (a
C++ source file, and just "clang -O2"). By
saying it doesn't reproduce in a mixed
configuration of an old version of clang to do
the C++ -> IR combined with a ToT version
of opt -O2 to do the IR -> object file is
misleading -- it's true, but that's not at all
what I was claiming, and I don't know where
it's coming from.</div>
</div>
</div>
</blockquote>
<p>I actually don't think this is going off track at
all. Our default is for IR test cases for IR
problems. Any reverting commit should generally
include a test case suitable for checkin (w/a bit of
cleanup) once the patch is fixed. I'll admit, we're
not strict about this, but the expectation is
definitely there.<br>
</p>
<p>The discussion of the hybrid configuration is
relevant *because* you didn't provide a test case in
a form I could easily use. I don't work on clang,
don't build it regularly, and shouldn't have to
investigate a LLVM codegen regression. <br>
</p>
<p>(See also below.)<br>
</p>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_quote">
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<ul>
</ul>
<p>Philip<br>
</p>
<p>p.s. To be clear, I'm happy to look at
your original issue this afternoon if
you've got something I can reproduce.</p>
</div>
</blockquote>
<div>Here's an IR reproducer with IR generated
from ToT before my revert (at
dfd27ebbd0eb137c9a439b7c537bb87ba903efd3):</div>
</div>
</div>
</blockquote>
<p>Ok, we have a problem here. None of the following
reproduce for me:<br>
</p>
<p>$ ./llc -O2 jordan.ll<br>
$ ./llc -O2 jordan.ll<br>
$ ./llc -O2 jordan.ll --filetype=obj<br>
$ ./llc -O3 jordan.ll --filetype=obj<br>
</p>
<p>LLC is ToT, just built with your change reverted
locally.<br>
</p>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_quote">
<div>$ bin/clang -c /tmp/repro.cc -O1 -S
-emit-llvm -o /tmp/repro.ll</div>
<div>$ bin/clang -c /tmp/repro.ll -O2 -o
/tmp/repro.o # hangs</div>
</div>
</div>
</blockquote>
<p>Given the preceding, I am now asserting this is
likely some clang specific problem. I've got a
build of clang running now, will report back in a
bit.</p>
</blockquote>
<p>With a newly build clang, I can reproduce what you're
seeing. However, no attempt to mine to get IR out
clang - I'm no expert here - has generated anything
standalone reproducible in IR.</p>
<p>Looking at debug output does make it look the
transform affected by the revert is involved in the
infinite loop, but I *strongly* suspect the actual
revert is just massaging the issue enough to avoid
something lurking.</p>
<p>I will spend some time this afternoon investigating
this. <br>
</p>
</blockquote>
<p>JFYI, found the root issue. As expected, it wasn't
directly related to the reverted change.</p>
</div>
</blockquote>
<div>Glad you were able to find the issue. I do understand
that software, especially compilers, can be extremely (and
sometimes subtly) complicated, and very often the culprit of
a bug is not the real root cause, but rather something that
surfaces a bug elsewhere. I hope it didn't come across that
I was implying this patch was the true blame of the issue.</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<p>Instead, it appears to be a bug introduced with
d9e93e8e57 early last week. I'll work up a fix and land
it, probably tomorrow. There's one more interaction I
want to make sure I understand, and I'm out of time for
today.<br>
</p>
</div>
</blockquote>
<div>This is a huge reason I am a fan of reverts as a default
first step. I want to make sure you take the time to fully
understand the issue, not burnout by working past normal
hours, not land a rushed fix that papers over the real bug,
etc. If we don't revert, then our progress is
blocked, everyone shares in the stress of trying to rush a
fix, etc., and I'm not a fan of that.</div>
</div>
</div>
</blockquote>
<p>In general, I agree with you. In this particular case, I'd have
probably reverted the change myself once I hit the point of
investigation when I sent the message you're replying to. I've
already explained up thread why I'd have waited until that point,
so I won't repeat myself. <br>
</p>
<p>My point in this thread has not been that we should never
revert. It's been that in this particular case, reverting without
any prior discussion, or information provided to justify the
urgency was a bit hasty. <br>
</p>
<p>Reading back over my original message this morning with fresh
eyes, I could see how I could have approached this differently,
and in an ideal world, probably should have. I do think it's
important to call out minor norm violations - because if we don't,
the norm quickly dies - but I could have done that by asking for
more information, not by demanding you revert the change. The
later setup a more adversarial framing than was warranted. <br>
</p>
<blockquote type="cite"
cite="mid:CABC7LbT4VX8VbFGCqse0Bg6e85=FSc06RMxC05RJxhJhK2=okQ@mail.gmail.com">
<div dir="ltr">
<div class="gmail_quote">
<div><br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<blockquote type="cite">
<p>I would strongly suggest you follow up with clang
folks to figure out why clang and llc are not matching
behavior. That's a serious problem.<br>
</p>
<blockquote type="cite">
<p>The other option is that this is someway specific
to your configuration. <br>
</p>
<p><br>
</p>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_quote">
<div><br>
</div>
<div>; ModuleID = '/tmp/repro.cc'<br>
source_filename = "/tmp/repro.cc"<br>
target datalayout =
"e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"<br>
target triple = "x86_64-unknown-linux-gnu"<br>
<br>
%class.D = type { i64 }<br>
%class.a = type { %class.g }<br>
%class.g = type { i32*, i32* }<br>
<br>
$_ZNK1aIliEixEl = comdat any<br>
<br>
$_ZNK1aIliE1jEv = comdat any<br>
<br>
@o = dso_local local_unnamed_addr global i32
0, align 4<br>
@p = dso_local local_unnamed_addr global i32
0, align 4<br>
@.str = private unnamed_addr constant [1 x i8]
zeroinitializer, align 1<br>
<br>
; Function Attrs: uwtable mustprogress<br>
define dso_local void
@_ZN1D1qERK1aIliE(%class.D* nocapture nonnull
dereferenceable(8) %0, %class.a* nonnull align
8 dereferenceable(16) %1) local_unnamed_addr
#0 align 2 {<br>
%3 = call i64 @_ZNK1aIliEixEl(%class.a*
nonnull dereferenceable(16) %1, i64 0) #3<br>
%4 = icmp eq i64 %3, 0<br>
br i1 %4, label %26, label %5<br>
<br>
5:
; preds = %2<br>
%6 = call i64 @_ZNK1aIliE1jEv(%class.a*
nonnull dereferenceable(16) %1)<br>
%7 = icmp eq i64 %6, 0<br>
br i1 %7, label %26, label %8<br>
<br>
8:
; preds = %5<br>
%9 = getelementptr inbounds %class.D,
%class.D* %0, i64 0, i32 0<br>
br label %10<br>
<br>
10:
; preds = %8, %18<br>
%11 = phi i64 [ 0, %8 ], [ %23, %18 ]<br>
%12 = call i64 @_ZNK1aIliEixEl(%class.a*
nonnull dereferenceable(16) %1, i64 %11) #3<br>
%13 = icmp eq i64 %12, 0<br>
br i1 %13, label %18, label %14<br>
<br>
14:
; preds = %10, %14<br>
%15 = load i32, i32* @o, align 4, !tbaa !2<br>
%16 = call i32 @_Z3fn1IiiEiT_T0_PKc(i32 %15,
i32 0, i8* getelementptr inbounds ([1 x i8],
[1 x i8]* @.str, i64 0, i64 0))<br>
%17 = icmp eq i32 %16, 0<br>
br i1 %17, label %18, label %14, !llvm.loop
!6<br>
<br>
18:
; preds = %14, %10<br>
%19 = call i64 @_ZNK1aIliEixEl(%class.a*
nonnull dereferenceable(16) %1, i64 %11) #3<br>
%20 = load i32, i32* @p, align 4, !tbaa !2<br>
%21 = sext i32 %20 to i64<br>
%22 = sdiv i64 %19, %21<br>
store i64 %22, i64* %9, align 8, !tbaa !9<br>
%23 = add i64 %11, 1<br>
%24 = call i64 @_ZNK1aIliE1jEv(%class.a*
nonnull dereferenceable(16) %1)<br>
%25 = icmp eq i64 %24, 0<br>
br i1 %25, label %26, label %10, !llvm.loop
!12<br>
<br>
26:
; preds = %18, %5, %2<br>
ret void<br>
}<br>
<br>
; Function Attrs: nounwind uwtable willreturn
mustprogress<br>
define linkonce_odr dso_local i64
@_ZNK1aIliEixEl(%class.a* nonnull
dereferenceable(16) %0, i64 %1)
local_unnamed_addr #1 comdat align 2 {<br>
%3 = getelementptr inbounds %class.a,
%class.a* %0, i64 0, i32 0, i32 0<br>
%4 = load i32*, i32** %3, align 8, !tbaa !13<br>
%5 = getelementptr inbounds i32, i32* %4,
i64 %1<br>
%6 = load i32, i32* %5, align 4, !tbaa !2<br>
%7 = sext i32 %6 to i64<br>
ret i64 %7<br>
}<br>
<br>
; Function Attrs: nounwind uwtable willreturn
mustprogress<br>
define linkonce_odr dso_local i64
@_ZNK1aIliE1jEv(%class.a* nonnull
dereferenceable(16) %0) local_unnamed_addr #1
comdat align 2 {<br>
%2 = getelementptr inbounds %class.a,
%class.a* %0, i64 0, i32 0, i32 1<br>
%3 = load i32*, i32** %2, align 8, !tbaa !16<br>
%4 = getelementptr inbounds %class.a,
%class.a* %0, i64 0, i32 0, i32 0<br>
%5 = load i32*, i32** %4, align 8, !tbaa !13<br>
%6 = ptrtoint i32* %3 to i64<br>
%7 = ptrtoint i32* %5 to i64<br>
%8 = sub i64 %6, %7<br>
%9 = ashr exact i64 %8, 2<br>
ret i64 %9<br>
}<br>
<br>
declare dso_local i32
@_Z3fn1IiiEiT_T0_PKc(i32, i32, i8*)
local_unnamed_addr #2<br>
<br>
attributes #0 = { uwtable mustprogress
"frame-pointer"="none"
"no-trapping-math"="true"
"stack-protector-buffer-size"="8"
"target-cpu"="x86-64"
"target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
"tune-cpu"="generic" }<br>
attributes #1 = { nounwind uwtable willreturn
mustprogress "frame-pointer"="none"
"no-trapping-math"="true"
"stack-protector-buffer-size"="8"
"target-cpu"="x86-64"
"target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
"tune-cpu"="generic" }<br>
attributes #2 = { "frame-pointer"="none"
"no-trapping-math"="true"
"stack-protector-buffer-size"="8"
"target-cpu"="x86-64"
"target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
"tune-cpu"="generic" }<br>
attributes #3 = { nounwind }<br>
<br>
!llvm.module.flags = !{!0}<br>
!llvm.ident = !{!1}<br>
<br>
!0 = !{i32 1, !"wchar_size", i32 4}<br>
!1 = !{!"clang version 13.0.0 (<a
href="https://github.com/llvm/llvm-project.git"
target="_blank" class="cremed"
moz-do-not-send="true">https://github.com/llvm/llvm-project.git</a>
dfd27ebbd0eb137c9a439b7c537bb87ba903efd3)"}<br>
!2 = !{!3, !3, i64 0}<br>
!3 = !{!"int", !4, i64 0}<br>
!4 = !{!"omnipotent char", !5, i64 0}<br>
!5 = !{!"Simple C++ TBAA"}<br>
!6 = distinct !{!6, !7, !8}<br>
!7 = !{!"llvm.loop.mustprogress"}<br>
!8 = !{!"llvm.loop.unroll.disable"}<br>
!9 = !{!10, !11, i64 0}<br>
!10 = !{!"_ZTS1D", !11, i64 0}<br>
!11 = !{!"long", !4, i64 0}<br>
!12 = distinct !{!12, !7, !8}<br>
!13 = !{!14, !15, i64 0}<br>
!14 = !{!"_ZTS1g", !15, i64 0, !15, i64 8}<br>
!15 = !{!"any pointer", !4, i64 0}<br>
</div>
<div>!16 = !{!14, !15, i64 8}</div>
<div> </div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<p> </p>
<div>On 3/12/21 1:59 PM, Jordan Rupprecht
via llvm-commits wrote:<br>
</div>
<blockquote type="cite">
<pre>Author: Jordan Rupprecht
Date: 2021-03-12T13:59:14-08:00
New Revision: 8d20f2c2c66eb486ff23cc3d55a53bd840b36971
URL: <a href="https://github.com/llvm/llvm-project/commit/8d20f2c2c66eb486ff23cc3d55a53bd840b36971" target="_blank" class="cremed" moz-do-not-send="true">https://github.com/llvm/llvm-project/commit/8d20f2c2c66eb486ff23cc3d55a53bd840b36971</a>
DIFF: <a href="https://github.com/llvm/llvm-project/commit/8d20f2c2c66eb486ff23cc3d55a53bd840b36971.diff" target="_blank" class="cremed" moz-do-not-send="true">https://github.com/llvm/llvm-project/commit/8d20f2c2c66eb486ff23cc3d55a53bd840b36971.diff</a>
LOG: Revert "[CodeGenPrepare] Fix isIVIncrement (PR49466)"
This reverts commit cf82700af8c658ae09b14c3d01bb1e73e48d3bd3 due to a compile timeout when building the following with `clang -O2`:
```
template <class, class = int> class a;
struct b {
using d = int *;
};
struct e {
using f = b::d;
};
class g {
public:
e::f h;
e::f i;
};
template <class, class> class a : g {
public:
long j() const { return i - h; }
long operator[](long) const noexcept;
};
template <class c, class k> long a<c, k>::operator[](long l) const noexcept {
return h[l];
}
template <typename m, typename n> int fn1(m, n, const char *);
int o, p;
class D {
void q(const a<long> &);
long r;
};
void D::q(const a<long> &l) {
int s;
if (l[0])
for (; l.j(); ++s) {
if (l[s])
while (fn1(o, 0, ""))
;
r = l[s] / p;
}
}
```
Added:
Modified:
llvm/lib/CodeGen/CodeGenPrepare.cpp
Removed:
llvm/test/CodeGen/X86/pr49466.ll
################################################################################
diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 0f698dd3b190..0b1156e2ace7 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -1332,7 +1332,7 @@ getIVIncrement(const PHINode *PN, const LoopInfo *LI) {
static bool isIVIncrement(const BinaryOperator *BO, const LoopInfo *LI) {
auto *PN = dyn_cast<PHINode>(BO->getOperand(0));
- if (!PN || LI->getLoopFor(BO->getParent()) != LI->getLoopFor(PN->getParent()))
+ if (!PN)
return false;
if (auto IVInc = getIVIncrement(PN, LI))
return IVInc->first == BO;
@@ -1347,7 +1347,6 @@ bool CodeGenPrepare::replaceMathCmpWithIntrinsic(BinaryOperator *BO,
if (!isIVIncrement(BO, LI))
return false;
const Loop *L = LI->getLoopFor(BO->getParent());
- assert(L && "L should not be null after isIVIncrement()");
// Do not risk on moving increment into a child loop.
if (LI->getLoopFor(Cmp->getParent()) != L)
return false;
diff --git a/llvm/test/CodeGen/X86/pr49466.ll b/llvm/test/CodeGen/X86/pr49466.ll
deleted file mode 100644
index 4f6574d9bbf2..000000000000
--- a/llvm/test/CodeGen/X86/pr49466.ll
+++ /dev/null
@@ -1,122 +0,0 @@
-; RUN: opt < %s -O2 -codegenprepare -S | FileCheck %s
-
-target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
-target triple = "x86_64-unknown-linux-gnu"
-
-@b = dso_local local_unnamed_addr global i64 0, align 8
-@c = dso_local local_unnamed_addr global i64 0, align 8
-@d = dso_local local_unnamed_addr global i64 0, align 8
-@e = dso_local local_unnamed_addr global i64 0, align 8
-@f = dso_local local_unnamed_addr global i64 0, align 8
-@g = dso_local local_unnamed_addr global i64 0, align 8
-
-; CHECK-LABEL: @m(
-
-define dso_local i32 @m() local_unnamed_addr {
-entry:
- %0 = load i64, i64* @f, align 8
- %1 = inttoptr i64 %0 to i32*
- %2 = load i64, i64* @c, align 8
- %conv18 = trunc i64 %2 to i32
- %cmp = icmp slt i32 %conv18, 3
- %3 = load i64, i64* @d, align 8
- %conv43 = trunc i64 %3 to i8
- %tobool40.not = icmp eq i8 %conv43, 0
- br label %for.cond
-
-for.cond: ; preds = %for.cond39.preheader, %entry
- %j.0 = phi i32 [ undef, %entry ], [ %j.1.lcssa, %for.cond39.preheader ]
- %p.0 = phi i64 [ undef, %entry ], [ %p.1.lcssa, %for.cond39.preheader ]
- %i.0 = phi i32 [ undef, %entry ], [ %i.1.lcssa, %for.cond39.preheader ]
- %cmp73 = icmp slt i32 %i.0, 3
- br i1 %cmp73, label %for.body.preheader, label %for.cond39.preheader
-
-for.body.preheader: ; preds = %for.cond
- br label %for.body
-
-for.cond1.loopexit: ; preds = %for.inc34.preheader, %for.end12
- br i1 %cmp, label %for.body, label %for.cond39.preheader.loopexit
-
-for.cond39.preheader.loopexit: ; preds = %for.cond1.loopexit
- br label %for.cond39.preheader
-
-for.cond39.preheader: ; preds = %for.cond39.preheader.loopexit, %for.cond
- %j.1.lcssa = phi i32 [ %j.0, %for.cond ], [ %conv18, %for.cond39.preheader.loopexit ]
- %p.1.lcssa = phi i64 [ %p.0, %for.cond ], [ 0, %for.cond39.preheader.loopexit ]
- %i.1.lcssa = phi i32 [ %i.0, %for.cond ], [ %conv18, %for.cond39.preheader.loopexit ]
- br i1 %tobool40.not, label %for.cond, label %for.inc42.preheader
-
-for.inc42.preheader: ; preds = %for.cond39.preheader
- br label %for.inc42
-
-for.body: ; preds = %for.body.preheader, %for.cond1.loopexit
- %l.176 = phi i8 [ %sub, %for.cond1.loopexit ], [ 0, %for.body.preheader ]
- %p.175 = phi i64 [ 0, %for.cond1.loopexit ], [ %p.0, %for.body.preheader ]
- %j.174 = phi i32 [ %conv18, %for.cond1.loopexit ], [ %j.0, %for.body.preheader ]
- %tobool.not = icmp eq i32 %j.174, 0
- br i1 %tobool.not, label %cleanup45, label %for.cond2.preheader
-
-for.cond2.preheader: ; preds = %for.body
- %tobool3.not69 = icmp eq i64 %p.175, 0
- %.pr.pre = load i64, i64* @e, align 8
- br i1 %tobool3.not69, label %for.end12, label %for.body4.preheader
-
-for.body4.preheader: ; preds = %for.cond2.preheader
- %4 = sub i64 0, %p.175
- %xtraiter = and i64 %4, 7
- %lcmp.mod.not = icmp eq i64 %xtraiter, 0
- br i1 %lcmp.mod.not, label %for.body4.prol.loopexit, label %for.body4.prol.preheader
-
-for.body4.prol.preheader: ; preds = %for.body4.preheader
- %5 = mul nsw i64 %xtraiter, -1
- br label %for.body4.prol
-
-for.body4.prol: ; preds = %for.body4.prol.preheader, %for.body4.prol
- %lsr.iv = phi i64 [ 0, %for.body4.prol.preheader ], [ %lsr.iv.next, %for.body4.prol ]
- %lsr.iv.next = add nsw i64 %lsr.iv, -1
- %prol.iter.cmp.not = icmp eq i64 %5, %lsr.iv.next
- br i1 %prol.iter.cmp.not, label %for.body4.prol.loopexit.loopexit, label %for.body4.prol
-
-for.body4.prol.loopexit.loopexit: ; preds = %for.body4.prol
- %6 = sub i64 %p.175, %lsr.iv.next
- br label %for.body4.prol.loopexit
-
-for.body4.prol.loopexit: ; preds = %for.body4.prol.loopexit.loopexit, %for.body4.preheader
- %p.270.unr = phi i64 [ %p.175, %for.body4.preheader ], [ %6, %for.body4.prol.loopexit.loopexit ]
- %7 = icmp ugt i64 %p.175, -8
- br i1 %7, label %for.end12, label %for.body4.preheader89
-
-for.body4.preheader89: ; preds = %for.body4.prol.loopexit
- br label %for.body4
-
-for.body4: ; preds = %for.body4.preheader89, %for.body4
- %p.270 = phi i64 [ %inc11.7, %for.body4 ], [ %p.270.unr, %for.body4.preheader89 ]
- %inc11.7 = add i64 %p.270, 8
- %tobool3.not.7 = icmp eq i64 %inc11.7, 0
- br i1 %tobool3.not.7, label %for.end12.loopexit, label %for.body4
-
-for.end12.loopexit: ; preds = %for.body4
- br label %for.end12
-
-for.end12: ; preds = %for.end12.loopexit, %for.body4.prol.loopexit, %for.cond2.preheader
- %8 = load i32, i32* %1, align 4
- %conv23 = zext i32 %8 to i64
- %9 = load i64, i64* @b, align 8
- %div24 = udiv i64 %9, %conv23
- store i64 %div24, i64* @b, align 8
- %sub = add i8 %l.176, -1
- %tobool32.not72 = icmp eq i64 %.pr.pre, 0
- br i1 %tobool32.not72, label %for.cond1.loopexit, label %for.inc34.preheader
-
-for.inc34.preheader: ; preds = %for.end12
- store i64 0, i64* @e, align 8
- br label %for.cond1.loopexit
-
-for.inc42: ; preds = %for.inc42.preheader, %for.inc42
- br label %for.inc42
-
-cleanup45: ; preds = %for.body
- %cmp13 = icmp ne i8 %l.176, 0
- %conv16 = zext i1 %cmp13 to i32
- ret i32 %conv16
-}
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