8332920: C2: Partial Peeling is wrongly applied for CmpU with negative limit #19522

chhagedorn · 2024-06-03T12:39:05Z

A signed test is wrongly split off an unsigned test during Partial Peeling which results in not entering a loop even though it should.

Idea of Partial Peeling

Partial Peeling rotates a loop with the hope to being able to convert the loop into a counted loop later. It is therefore preferable to use signed tests over unsigned tests because counted loops must use a signed loop exit test (i.e. with a BaseCountedLoopEnd).

Partial Peeling with Unsigned Test

However, if there is only a suitable unsigned test, we can still try to use it for Partial Peeling. The idea is to then split off a signed version of the unsigned test and place it right before the unsigned test which can then be used as a loop exit test and later as BaseCountedLoopEnd:

jdk/src/hotspot/share/opto/loopopts.cpp

Lines 3074 to 3080 in 0ea3bac

    
           // Loop: 
        
           //   <peeled section> 
        
           //   Signed Loop Exit Condition i < 0 or i >= limit 
        
           //   <-- CUT HERE --> 
        
           //   Unsigned Loop Exit Condition i >=u limit 
        
           //   <rest of unpeeled section> 
        
           //   goto Loop

Requirements for Using an Unsigned Test

The Signed and Unsigned Loop Exit Test do not need have the same result at runtime. It is sufficient if the Signed Loop Exit Test implies the Unsigned Loop Exit Test:

If the Signed Loop Exit Test is false, then the (original) Unsigned Loop Exit Test will make sure to exit the loop if required.
If the Signed Loop Exit Test is true, then the (original) Unsigned Loop Exit Test must also be true. Otherwise, we would exit a loop that we should have continued to execute.

The Requirements Are Currently Broken

This strong requirement for splitting off a signed test is currently broken as seen in the test cases (for example, testWhileLTIncr()): We split off the signed loop exit test i >= limit, then partial peel and we get the signed loop exit test i >= limit as entry guard to the loop which is wrong:

jdk/test/hotspot/jtreg/compiler/loopopts/TestPartialPeelAtUnsignedTestsNegativeLimit.java

Lines 159 to 178 in 0ea3bac

    
           // After Partial Peeling, we have: 
        
           //   if (i >= limit) goto Exit 
        
           // Loop: 
        
           //   if (i >=u limit) goto Exit 
        
           //   ... 
        
           //   i++; 
        
           //   if (i >= limit) goto Exit 
        
           //   goto Loop 
        
           // Exit: 
        
           //   ... 
        
           // 
        
           // If init = MAX_VALUE and limit = MIN_VALUE: 
        
           //   i >= limit 
        
           //   MAX_VALUE >= MIN_VALUE 
        
           // which is true where 
        
           //   i >=u limit 
        
           //   MAX_VALUE >=u MIN_VALUE 
        
           //   MAX_VALUE >=u (uint)(MAX_INT + 1) 
        
           // is false and we wrongly never enter the loop even though we should have. 
        
           // This results in a wrong execution.

Why Are the Requirements Broken?

The reason is that

i >=u limit

can only be converted into the two signed comparisons

i < 0 || i >= limit

if limit is non-negative (i.e. limit >= 0):

jdk/src/hotspot/share/opto/loopopts.cpp

Lines 3054 to 3061 in 0ea3bac

    
           // Note that this does not hold for limit < 0: 
        
           // Example with i = -3 and limit = -2: 
        
           //   i  < 0 
        
           //   -2 < 0 
        
           // is true and thus also "i < 0 || i >= limit". But 
        
           //   i  >=u limit 
        
           //   -3 >=u -2 
        
           // is false.

This is currently missing and we wrongly use i < 0 or i >= limit as split off signed test.

Fixing the Broken Requirements

To fix this, I've added a bailout when limit could be negative which is the same as checking if the type of limit contains a negative value:

jdk/src/hotspot/share/opto/loopopts.cpp

Lines 3062 to 3066 in 0ea3bac

    
           Node* limit = cmpu->in(2); 
        
           const TypeInt* type_limit = _igvn.type(limit)->is_int(); 
        
           if (type_limit->_lo < 0) { 
        
             return nullptr; 
        
           }

Thanks,
Christian

Progress

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Change must not contain extraneous whitespace
Commit message must refer to an issue

Issue

JDK-8332920: C2: Partial Peeling is wrongly applied for CmpU with negative limit (Bug - P2)(⚠️ The fixVersion in this issue is [23] but the fixVersion in .jcheck/conf is 24, a new backport will be created when this pr is integrated.)

Reviewers

Vladimir Kozlov (@vnkozlov - Reviewer) ⚠️ Review applies to e0a18f06
Tobias Hartmann (@TobiHartmann - Reviewer) ⚠️ Review applies to 33d89249
Emanuel Peter (@eme64 - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/19522/head:pull/19522
$ git checkout pull/19522

Update a local copy of the PR:
$ git checkout pull/19522
$ git pull https://git.openjdk.org/jdk.git pull/19522/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 19522

View PR using the GUI difftool:
$ git pr show -t 19522

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/19522.diff

Webrev

Link to Webrev Comment

…e limit

bridgekeeper · 2024-06-03T12:40:02Z

👋 Welcome back chagedorn! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

openjdk · 2024-06-03T12:40:54Z

@chhagedorn This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8332920: C2: Partial Peeling is wrongly applied for CmpU with negative limit

Reviewed-by: kvn, thartmann, epeter

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 81 new commits pushed to the master branch:

2a37764: 8333743: Change .jcheck/conf branches property to match valid branches
75dc2f8: 8330182: Start of release updates for JDK 24
054362a: 8332550: [macos] Voice Over: java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
9b436d0: 8333674: Disable CollectorPolicy.young_min_ergo_vm for PPC64
487c477: 8333647: C2 SuperWord: some additional PopulateIndex tests
d02cb74: 8333270: HandlersOnComplexResetUpdate and HandlersOnComplexUpdate tests fail with "Unexpected reference" if timeoutFactor is less than 1/3
02f2404: 8333560: -Xlint:restricted does not work with --release
606df44: 8332670: C1 clone intrinsic needs memory barriers
33fd6ae: 8333622: ubsan: relocInfo_x86.cpp:101:56: runtime error: pointer index expression with base (-1) overflowed
8de5d20: 8332865: ubsan: os::attempt_reserve_memory_between reports overflow
... and 71 more: https://git.openjdk.org/jdk/compare/91101f0d4fc8e06d0d74e06361db6ac87efeeb8e...master

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openjdk · 2024-06-03T12:41:25Z

@chhagedorn The following label will be automatically applied to this pull request:

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mlbridge · 2024-06-03T13:08:28Z

Webrevs

vnkozlov

Looks good.

chhagedorn · 2024-06-04T09:05:04Z

Thanks Vladimir for your review!

TobiHartmann

If the Signed Loop Exit Test is false, then the (original) Unsigned Loop Exit Test will make sure to exit the loop if required.

Is that comment incorrect then?

jdk/src/hotspot/share/opto/loopopts.cpp

Lines 2993 to 2994 in 2edb6d9

    
           // if and it's projections.  The original if test is replaced with 
        
           // a constant to force the stay-in-loop path.

eme64

More to come later

eme64 · 2024-06-05T07:04:25Z

src/hotspot/share/opto/loopopts.cpp

+  // If
+  //   limit >= 0   (COND)
+  // then the unsigned loop exit condition is equivalent to the signed loop exit condition
+  //   i < 0 || i >= limit


Could we come up with an alternative equation if limit < 0? And maybe even a combined condition? Not sure if that is helpful, but I'd like to think about it. Could also be a follow-up RFE.

I have not thought about it, yet, but I also have a feeling that we might can do better. Since this is a P2 bug fix, I propose to do that separately in an RFE as you suggested.

eme64 · 2024-06-05T07:09:08Z

src/hotspot/share/opto/loopopts.cpp

+  // to be true (otherwise, we wrongly exit a loop that should not have been exited). More formally, we need to ensure:
+  //   "Signed Loop Exit Test" implies "Unsigned Loop Exit Test"
+  // This is trivially given:
+  // - Stride < 0:


Suggested change

// - Stride < 0:

// - stride < 0:

Stylistic decision, leave this to your

eme64 · 2024-06-05T07:11:58Z

src/hotspot/share/opto/loopopts.cpp

+    return nullptr;
+  }
+
+  // For stride < 0, we split off the signed loop exit condition


Suggested change

// For stride < 0, we split off the signed loop exit condition

// For stride < 0, we insert off the signed loop exit condition

Why do you say "split", we are inserting this extra check, right? Or is the idea that the "rotation" puts this new condition as the last check, hence the exit check in the loop body? Being a big more explicit could help here.

eme64 · 2024-06-05T07:13:06Z

src/hotspot/share/opto/loopopts.cpp

+  //     Unsigned Loop Exit Condition i >=u limit
+  //     <rest of unpeeled section>
+  //     <peeled section>
+  //     Signed Loop Exit Condition i < 0 or i >= limit


There is not litterally an OR here, right? It's a bit confusing.

TobiHartmann

Looks great otherwise. Nice test and proof!

test/hotspot/jtreg/compiler/loopopts/TestPartialPeelAtUnsignedTestsNegativeLimit.java

TobiHartmann · 2024-06-05T07:27:45Z

src/hotspot/share/opto/loopopts.cpp

+  //
+  // After Partial Peeling, we have the following structure:
+  //   <cloned peeled section>
+  //   Signed Loop Exit Condition i < 0 or i >= limit


Suggested change

// Signed Loop Exit Condition i < 0 or i >= limit

// Signed Loop Exit Condition i < 0 (or i >= limit)

TobiHartmann · 2024-06-05T07:27:55Z

src/hotspot/share/opto/loopopts.cpp

+  //     Unsigned Loop Exit Condition i >=u limit
+  //     <rest of unpeeled section>
+  //     <peeled section>
+  //     Signed Loop Exit Condition i < 0 or i >= limit


Suggested change

// Signed Loop Exit Condition i < 0 or i >= limit

// Signed Loop Exit Condition i < 0 (or i >= limit)

TobiHartmann · 2024-06-05T07:28:33Z

src/hotspot/share/opto/loopopts.cpp

+  //
+  // Loop:
+  //   <peeled section>
+  //   Signed Loop Exit Condition i < 0 or i >= limit


Suggested change

// Signed Loop Exit Condition i < 0 or i >= limit

// Signed Loop Exit Condition i < 0 (or i >= limit)

TobiHartmann · 2024-06-05T07:31:01Z

src/hotspot/share/opto/loopopts.cpp

+  // then the unsigned loop exit condition is equivalent to the signed loop exit condition
+  //   i < 0 || i >= limit
+  //
+  // Note that this does not hold for limit < 0:


As we discussed, rephrase this as counterexample.

TobiHartmann · 2024-06-05T07:45:52Z

src/hotspot/share/opto/loopopts.cpp

+  // - Stride < 0:
+  //      i <   0        // Signed Loop Exit Condition
+  //      i >u  MAX_INT  // all negative values are greater than MAX_INT when converted to unsigned
+  //      i >=u limit    // limit <= MAX_INT (trivially) and since limit >= 0 assumption (COND)


As we discussed, an intermediate step in the proof would be good here.

…thod comment

TobiHartmann

Nice! That looks good to me.

chhagedorn · 2024-06-05T12:24:44Z

Thanks Tobias for your review!

eme64 · 2024-06-05T12:38:46Z

src/hotspot/share/opto/loopopts.cpp

+//    dummy-if      |
+//     /  |         |
+// other  |         |


what is this?

This dummy-if is created with insert_region_before_proj() such that we can have a region between the exit projection (exit-proj) of the original unsigned loop exit test and the If node while keeping both the If and the exit-proj. Also see:

jdk/src/hotspot/share/opto/loopopts.cpp

Lines 2934 to 2960 in cbb6747

//------------------------------ insert_region_before_proj -------------------------------------

// Insert a region before an if projection (* - new node)

//

// before

// if(test)

// / |

// v |

// proj v

// other-proj

//

// after

// if(test)

// / |

// v |

// * proj-clone v

// | other-proj

// v

// * new-region

// |

// v

// * dum_if

// / \

// v \

// * dum-proj v

// proj

//

RegionNode* PhaseIdealLoop::insert_region_before_proj(ProjNode* proj) {

src/hotspot/share/opto/loopopts.cpp

eme64 · 2024-06-05T12:54:21Z

test/hotspot/jtreg/compiler/loopopts/TestPartialPeelAtUnsignedTestsNegativeLimit.java

+        testWhileLTDecr(MIN_VALUE + 2000, -2000);
+        check(MIN_VALUE + 2001); // MAX_VALUE + 2002 iterations
+        testWhileLTDecr(MIN_VALUE + 2000, MIN_VALUE + 2001);
+        check(MIN_VALUE + 2001); // MAX_VALUE + 2002 iterations


Could you also add a randomized input test here, that plays close to the boundaries? Just to make sure we would catch things like some off-by one errors.

Good idea, I've added some random test and computed the number of iteration that I expect. I only did it for the interesting cases.

Co-authored-by: Emanuel Peter <emanuel.peter@oracle.com> Co-authored-by: Tobias Hartmann <tobias.hartmann@oracle.com>

vnkozlov

Update is good.

eme64

Nice work with the proofs, good work @chhagedorn !

eme64 · 2024-06-06T06:59:13Z

src/hotspot/share/opto/loopopts.cpp

+//   v  v  v        |
+//  exit-region     |
+//        |         |
+//    dummy-if      |


Still, I don't see this dummy-if mentioned in any of the comments. Can you add a comment line about what this is, and where it comes from?

Fair point, added a note.

chhagedorn · 2024-06-06T07:34:45Z

Thanks Vladimir and Emanuel for your reviews!

I've submitted some sanity performance testing since we could now be bailing out more. I'm not sure though how much else we could do if there are some performance regressions.

chhagedorn · 2024-06-11T11:31:29Z

Performance testing looked good. Thanks again for your careful reviews!

/integrate

openjdk · 2024-06-11T11:32:16Z

Going to push as commit ef101f1.
Since your change was applied there have been 131 commits pushed to the master branch:

2843745: 8333972: Parallel: Remove unused methods in PSOldGen
93f3918: 8333954: Parallel: Remove unused arguments of type ParCompactionManager*
788b876: 8333917: G1: Refactor G1CollectedHeap::register_old_region_with_region_attr
0e4d4a0: 8320725: AArch64: C2: Add "requires_strict_order" flag for floating-point add and mul reduction
badf1cb: 8331675: gtest CollectorPolicy.young_min_ergo_vm fails after 8272364
4d6064a: 8333649: Allow different NativeCall encodings
fe9c63c: 8333931: Problemlist serviceability/jvmti/vthread/CarrierThreadEventNotification
41c88bc: 8333756: java/lang/instrument/NativeMethodPrefixApp.java failed due to missing intrinsic
3a01b47: 8330205: Initial troff manpage generation for JDK 24
9691153: 8329141: Obsolete RTM flags and code
... and 121 more: https://git.openjdk.org/jdk/compare/91101f0d4fc8e06d0d74e06361db6ac87efeeb8e...master

Your commit was automatically rebased without conflicts.

openjdk · 2024-06-11T11:32:22Z

@chhagedorn Pushed as commit ef101f1.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

chhagedorn · 2024-06-11T11:37:10Z

/backport jdk:jdk23

openjdk · 2024-06-11T11:37:56Z

@chhagedorn the backport was successfully created on the branch backport-chhagedorn-ef101f1b-jdk23 in my personal fork of openjdk/jdk. To create a pull request with this backport targeting openjdk/jdk:jdk23, just click the following link:

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Hi all,

This pull request contains a backport of commit ef101f1b from the openjdk/jdk repository.

The commit being backported was authored by Christian Hagedorn on 11 Jun 2024 and was reviewed by Vladimir Kozlov, Tobias Hartmann and Emanuel Peter.

Thanks!

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$ git checkout backport-chhagedorn-ef101f1b-jdk23
# make changes
$ git add paths/to/changed/files
$ git commit --message 'Describe additional changes made'
$ git push https://github.com/openjdk-bots/jdk.git backport-chhagedorn-ef101f1b-jdk23

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8332920: C2: Partial Peeling is wrongly applied for CmpU with negativ…

0ea3bac

…e limit

openjdk bot added the hotspot-compiler hotspot-compiler-dev@openjdk.org label Jun 3, 2024

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Updated comments, improved proofs, improved motivation and idea at me…

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Fix test timeout with DeoptimizeALot and fix graph comment

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Co-authored-by: Emanuel Peter <emanuel.peter@oracle.com> Co-authored-by: Tobias Hartmann <tobias.hartmann@oracle.com>

Add randomized tests

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	// Loop:
	// <peeled section>
	// Signed Loop Exit Condition i < 0 or i >= limit
	// <-- CUT HERE -->
	// Unsigned Loop Exit Condition i >=u limit
	// <rest of unpeeled section>
	// goto Loop

	// After Partial Peeling, we have:
	// if (i >= limit) goto Exit
	// Loop:
	// if (i >=u limit) goto Exit
	// ...
	// i++;
	// if (i >= limit) goto Exit
	// goto Loop
	// Exit:
	// ...
	//
	// If init = MAX_VALUE and limit = MIN_VALUE:
	// i >= limit
	// MAX_VALUE >= MIN_VALUE
	// which is true where
	// i >=u limit
	// MAX_VALUE >=u MIN_VALUE
	// MAX_VALUE >=u (uint)(MAX_INT + 1)
	// is false and we wrongly never enter the loop even though we should have.
	// This results in a wrong execution.

	// Note that this does not hold for limit < 0:
	// Example with i = -3 and limit = -2:
	// i < 0
	// -2 < 0
	// is true and thus also "i < 0 \|\| i >= limit". But
	// i >=u limit
	// -3 >=u -2
	// is false.

	Node* limit = cmpu->in(2);
	const TypeInt* type_limit = _igvn.type(limit)->is_int();
	if (type_limit->_lo < 0) {
	return nullptr;
	}

	// if and it's projections. The original if test is replaced with
	// a constant to force the stay-in-loop path.

	// For stride < 0, we split off the signed loop exit condition
	// For stride < 0, we insert off the signed loop exit condition

	// Signed Loop Exit Condition i < 0 or i >= limit
	// Signed Loop Exit Condition i < 0 (or i >= limit)

	//------------------------------ insert_region_before_proj -------------------------------------
	// Insert a region before an if projection (* - new node)
	//
	// before
	// if(test)
	// / \|
	// v \|
	// proj v
	// other-proj
	//
	// after
	// if(test)
	// / \|
	// v \|
	// * proj-clone v
	// \| other-proj
	// v
	// * new-region
	// \|
	// v
	// * dum_if
	// / \
	// v \
	// * dum-proj v
	// proj
	//
	RegionNode* PhaseIdealLoop::insert_region_before_proj(ProjNode* proj) {

8332920: C2: Partial Peeling is wrongly applied for CmpU with negative limit #19522

8332920: C2: Partial Peeling is wrongly applied for CmpU with negative limit #19522

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Idea of Partial Peeling

Partial Peeling with Unsigned Test

Requirements for Using an Unsigned Test

The Requirements Are Currently Broken

Why Are the Requirements Broken?

Fixing the Broken Requirements

Progress

Issue

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