[llvm] 8d20f2c - Revert "[CodeGenPrepare] Fix isIVIncrement (PR49466)"
Philip Reames via llvm-commits
llvm-commits at lists.llvm.org
Sat Mar 13 15:33:53 PST 2021
On 3/12/21 4:24 PM, Philip Reames via llvm-commits wrote:
>
>
> On 3/12/21 3:35 PM, Philip Reames via llvm-commits wrote:
>>
>>
>> On 3/12/21 3:22 PM, Philip Reames via llvm-commits wrote:
>>>
>>>
>>> On 3/12/21 2:59 PM, Jordan Rupprecht wrote:
>>>>
>>>>
>>>> On Fri, Mar 12, 2021 at 4:29 PM Philip Reames
>>>> <listmail at philipreames.com <mailto:listmail at philipreames.com>> wrote:
>>>>
>>>> Jordan,
>>>>
>>>> Please revert this change.
>>>>
>>>> There's a couple of problems here:
>>>>
>>>> * The change reverted looks obviously innocent. (e.g. it's
>>>> bailing out of a transform slightly more often)
>>>>
>>>> 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.
>>>
>>> You're correct, but missing the point I was getting at. Admittedly,
>>> poorly worded.
>>>
>>> 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.
>>>
>>>> * 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.
>>>>
>>>> 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.
>>>
>>> Bug? Discussion? Response to original commit?
>>>
>>> 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.
>>>
>>> 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.
>>>
>>>> * 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.
>>>>
>>>> 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.
>>> Thanks for the acknowledgement. To be fair, it would have been less
>>> of an issue if the reproducer worked straight forwardly.
>>>>
>>>> * Failure to provide an IR test case.
>>>>
>>>> (ditto, but see one below)
>>>>
>>>> * 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.
>>>>
>>>> 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.
>>>
>>> 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.
>>>
>>> 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.
>>>
>>> (See also below.)
>>>
>>>> Philip
>>>>
>>>> p.s. To be clear, I'm happy to look at your original issue this
>>>> afternoon if you've got something I can reproduce.
>>>>
>>>> Here's an IR reproducer with IR generated from ToT before my revert
>>>> (at dfd27ebbd0eb137c9a439b7c537bb87ba903efd3):
>>>
>>> Ok, we have a problem here. None of the following reproduce for me:
>>>
>>> $ ./llc -O2 jordan.ll
>>> $ ./llc -O2 jordan.ll
>>> $ ./llc -O2 jordan.ll --filetype=obj
>>> $ ./llc -O3 jordan.ll --filetype=obj
>>>
>>> LLC is ToT, just built with your change reverted locally.
>>>
>>>> $ bin/clang -c /tmp/repro.cc -O1 -S -emit-llvm -o /tmp/repro.ll
>>>> $ bin/clang -c /tmp/repro.ll -O2 -o /tmp/repro.o # hangs
>>>
>>> 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.
>>>
>> 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.
>>
>> 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.
>>
>> I will spend some time this afternoon investigating this.
>>
> JFYI, found the root issue. As expected, it wasn't directly related
> to the reverted change.
>
> 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.
>
(For this response, sticking purely to a technical update. Jordan, will
reply to your response for non-technical stuff, I just wanted to
separate the two threads of discussion.)
Turned out to be a good thing I took a fresh look because it turned out
my initial thought for a fix wasn't addressing the root issue.
The root issue is fixed in 9228f2f3225. Essentially, we had two
transforms fighting each other because they disagreed about a
definition. The reverted change made the problem worse, but the code
even without it had the potential issue. It's just really really hard
to trip CGP into actually let the two alternate. :)
With the root issue fixed, I reapplied a tweaked version of the reverted
change. That's been pushed as 7d38a91a7f.
I ran both Jordan's C example, and the original motivating c++ test case
for the reverted change. Both pass on ToT. If you run into any further
issues, please let me know.
>> 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.
>>
>>> The other option is that this is someway specific to your
>>> configuration.
>>>
>>>
>>>>
>>>> ; ModuleID = '/tmp/repro.cc'
>>>> source_filename = "/tmp/repro.cc"
>>>> 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"
>>>>
>>>> %class.D = type { i64 }
>>>> %class.a = type { %class.g }
>>>> %class.g = type { i32*, i32* }
>>>>
>>>> $_ZNK1aIliEixEl = comdat any
>>>>
>>>> $_ZNK1aIliE1jEv = comdat any
>>>>
>>>> @o = dso_local local_unnamed_addr global i32 0, align 4
>>>> @p = dso_local local_unnamed_addr global i32 0, align 4
>>>> @.str = private unnamed_addr constant [1 x i8] zeroinitializer, align 1
>>>>
>>>> ; Function Attrs: uwtable mustprogress
>>>> 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 {
>>>> %3 = call i64 @_ZNK1aIliEixEl(%class.a* nonnull
>>>> dereferenceable(16) %1, i64 0) #3
>>>> %4 = icmp eq i64 %3, 0
>>>> br i1 %4, label %26, label %5
>>>>
>>>> 5: ; preds = %2
>>>> %6 = call i64 @_ZNK1aIliE1jEv(%class.a* nonnull
>>>> dereferenceable(16) %1)
>>>> %7 = icmp eq i64 %6, 0
>>>> br i1 %7, label %26, label %8
>>>>
>>>> 8: ; preds = %5
>>>> %9 = getelementptr inbounds %class.D, %class.D* %0, i64 0, i32 0
>>>> br label %10
>>>>
>>>> 10: ; preds = %8, %18
>>>> %11 = phi i64 [ 0, %8 ], [ %23, %18 ]
>>>> %12 = call i64 @_ZNK1aIliEixEl(%class.a* nonnull
>>>> dereferenceable(16) %1, i64 %11) #3
>>>> %13 = icmp eq i64 %12, 0
>>>> br i1 %13, label %18, label %14
>>>>
>>>> 14: ; preds = %10, %14
>>>> %15 = load i32, i32* @o, align 4, !tbaa !2
>>>> %16 = call i32 @_Z3fn1IiiEiT_T0_PKc(i32 %15, i32 0, i8*
>>>> getelementptr inbounds ([1 x i8], [1 x i8]* @.str, i64 0, i64 0))
>>>> %17 = icmp eq i32 %16, 0
>>>> br i1 %17, label %18, label %14, !llvm.loop !6
>>>>
>>>> 18: ; preds = %14, %10
>>>> %19 = call i64 @_ZNK1aIliEixEl(%class.a* nonnull
>>>> dereferenceable(16) %1, i64 %11) #3
>>>> %20 = load i32, i32* @p, align 4, !tbaa !2
>>>> %21 = sext i32 %20 to i64
>>>> %22 = sdiv i64 %19, %21
>>>> store i64 %22, i64* %9, align 8, !tbaa !9
>>>> %23 = add i64 %11, 1
>>>> %24 = call i64 @_ZNK1aIliE1jEv(%class.a* nonnull
>>>> dereferenceable(16) %1)
>>>> %25 = icmp eq i64 %24, 0
>>>> br i1 %25, label %26, label %10, !llvm.loop !12
>>>>
>>>> 26: ; preds = %18, %5, %2
>>>> ret void
>>>> }
>>>>
>>>> ; Function Attrs: nounwind uwtable willreturn mustprogress
>>>> define linkonce_odr dso_local i64 @_ZNK1aIliEixEl(%class.a* nonnull
>>>> dereferenceable(16) %0, i64 %1) local_unnamed_addr #1 comdat align 2 {
>>>> %3 = getelementptr inbounds %class.a, %class.a* %0, i64 0, i32 0,
>>>> i32 0
>>>> %4 = load i32*, i32** %3, align 8, !tbaa !13
>>>> %5 = getelementptr inbounds i32, i32* %4, i64 %1
>>>> %6 = load i32, i32* %5, align 4, !tbaa !2
>>>> %7 = sext i32 %6 to i64
>>>> ret i64 %7
>>>> }
>>>>
>>>> ; Function Attrs: nounwind uwtable willreturn mustprogress
>>>> define linkonce_odr dso_local i64 @_ZNK1aIliE1jEv(%class.a* nonnull
>>>> dereferenceable(16) %0) local_unnamed_addr #1 comdat align 2 {
>>>> %2 = getelementptr inbounds %class.a, %class.a* %0, i64 0, i32 0,
>>>> i32 1
>>>> %3 = load i32*, i32** %2, align 8, !tbaa !16
>>>> %4 = getelementptr inbounds %class.a, %class.a* %0, i64 0, i32 0,
>>>> i32 0
>>>> %5 = load i32*, i32** %4, align 8, !tbaa !13
>>>> %6 = ptrtoint i32* %3 to i64
>>>> %7 = ptrtoint i32* %5 to i64
>>>> %8 = sub i64 %6, %7
>>>> %9 = ashr exact i64 %8, 2
>>>> ret i64 %9
>>>> }
>>>>
>>>> declare dso_local i32 @_Z3fn1IiiEiT_T0_PKc(i32, i32, i8*)
>>>> local_unnamed_addr #2
>>>>
>>>> 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" }
>>>> 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" }
>>>> 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" }
>>>> attributes #3 = { nounwind }
>>>>
>>>> !llvm.module.flags = !{!0}
>>>> !llvm.ident = !{!1}
>>>>
>>>> !0 = !{i32 1, !"wchar_size", i32 4}
>>>> !1 = !{!"clang version 13.0.0
>>>> (https://github.com/llvm/llvm-project.git
>>>> <https://github.com/llvm/llvm-project.git>
>>>> dfd27ebbd0eb137c9a439b7c537bb87ba903efd3)"}
>>>> !2 = !{!3, !3, i64 0}
>>>> !3 = !{!"int", !4, i64 0}
>>>> !4 = !{!"omnipotent char", !5, i64 0}
>>>> !5 = !{!"Simple C++ TBAA"}
>>>> !6 = distinct !{!6, !7, !8}
>>>> !7 = !{!"llvm.loop.mustprogress"}
>>>> !8 = !{!"llvm.loop.unroll.disable"}
>>>> !9 = !{!10, !11, i64 0}
>>>> !10 = !{!"_ZTS1D", !11, i64 0}
>>>> !11 = !{!"long", !4, i64 0}
>>>> !12 = distinct !{!12, !7, !8}
>>>> !13 = !{!14, !15, i64 0}
>>>> !14 = !{!"_ZTS1g", !15, i64 0, !15, i64 8}
>>>> !15 = !{!"any pointer", !4, i64 0}
>>>> !16 = !{!14, !15, i64 8}
>>>>
>>>> On 3/12/21 1:59 PM, Jordan Rupprecht via llvm-commits wrote:
>>>>> Author: Jordan Rupprecht
>>>>> Date: 2021-03-12T13:59:14-08:00
>>>>> New Revision: 8d20f2c2c66eb486ff23cc3d55a53bd840b36971
>>>>>
>>>>> URL:https://github.com/llvm/llvm-project/commit/8d20f2c2c66eb486ff23cc3d55a53bd840b36971 <https://github.com/llvm/llvm-project/commit/8d20f2c2c66eb486ff23cc3d55a53bd840b36971>
>>>>> DIFF:https://github.com/llvm/llvm-project/commit/8d20f2c2c66eb486ff23cc3d55a53bd840b36971.diff <https://github.com/llvm/llvm-project/commit/8d20f2c2c66eb486ff23cc3d55a53bd840b36971.diff>
>>>>>
>>>>> 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"
>>>>> -
>>>>> - at b = dso_local local_unnamed_addr global i64 0, align 8
>>>>> - at c = dso_local local_unnamed_addr global i64 0, align 8
>>>>> - at d = dso_local local_unnamed_addr global i64 0, align 8
>>>>> - at e = dso_local local_unnamed_addr global i64 0, align 8
>>>>> - at f = dso_local local_unnamed_addr global i64 0, align 8
>>>>> - at 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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>>>>> llvm-commits at lists.llvm.org <mailto:llvm-commits at lists.llvm.org>
>>>>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits <https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits>
>>>>
>>>
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>>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
>>
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