[MLIR][Arith] Add ExpandOps to convertArithToLLVM #117305

nujaa · 2024-11-22T09:29:23Z

Arith Floor and Ceil ops would not get lowered when running --convert-arith-to-llvm.

banach-space · 2024-11-22T14:36:22Z

Hey Hugo, thanks for sending this! This is marked as draft, so I presume not yet ready for reviewing?

llvmbot · 2024-11-27T07:52:04Z

@llvm/pr-subscribers-mlir

Author: Hugo Trachino (nujaa)

Changes

Arith Floor and Ceil ops would not get lowered when running --convert-arith-to-llvm.

Full diff: https://github.com/llvm/llvm-project/pull/117305.diff

2 Files Affected:

(modified) mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp (+4-1)
(modified) mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir (+62)

diff --git a/mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp b/mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp
index aac24f113d891f..b1a971e3e9e8eb 100644
--- a/mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp
+++ b/mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp
@@ -13,6 +13,7 @@
 #include "mlir/Conversion/LLVMCommon/ConversionTarget.h"
 #include "mlir/Conversion/LLVMCommon/VectorPattern.h"
 #include "mlir/Dialect/Arith/IR/Arith.h"
+#include "mlir/Dialect/Arith/Transforms/Passes.h"
 #include "mlir/Dialect/LLVMIR/LLVMAttrs.h"
 #include "mlir/Dialect/LLVMIR/LLVMDialect.h"
 #include "mlir/IR/TypeUtilities.h"
@@ -477,7 +478,8 @@ struct ArithToLLVMConversionPass
       options.overrideIndexBitwidth(indexBitwidth);
 
     LLVMTypeConverter converter(&getContext(), options);
-    mlir::arith::populateArithToLLVMConversionPatterns(converter, patterns);
+    arith::populateArithExpandOpsPatterns(patterns);
+    arith::populateArithToLLVMConversionPatterns(converter, patterns);
 
     if (failed(applyPartialConversion(getOperation(), target,
                                       std::move(patterns))))
@@ -503,6 +505,7 @@ struct ArithToLLVMDialectInterface : public ConvertToLLVMPatternInterface {
   void populateConvertToLLVMConversionPatterns(
       ConversionTarget &target, LLVMTypeConverter &typeConverter,
       RewritePatternSet &patterns) const final {
+    arith::populateArithExpandOpsPatterns(patterns);
     arith::populateArithToLLVMConversionPatterns(typeConverter, patterns);
   }
 };
diff --git a/mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir b/mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir
index 64c40f1aba43bc..a9dcc0a16b3dbd 100644
--- a/mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir
+++ b/mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir
@@ -540,6 +540,68 @@ func.func @select(%arg0 : i1, %arg1 : i32, %arg2 : i32) -> i32 {
 
 // -----
 
+// CHECK-LABEL: @ceildivsi
+// CHECK-SAME: %[[ARG0:.*]]: i64) -> i64
+func.func @ceildivsi(%arg0 : i64) -> i64 {
+  // CHECK: %[[CST0:.*]] = llvm.mlir.constant(1 : i64) : i64
+  // CHECK: %[[CST1:.*]] = llvm.mlir.constant(0 : i64) : i64
+  // CHECK: %[[CST2:.*]] = llvm.mlir.constant(-1 : i64) : i64
+  // CHECK: %[[CMP0:.*]] = llvm.icmp "sgt" %[[ARG0]], %[[CST1]] : i64
+  // CHECK: %[[SEL0:.*]] = llvm.select %[[CMP0]], %[[CST2]], %[[CST0]] : i1, i64
+  // CHECK: %[[ADD0:.*]] = llvm.add %[[SEL0]], %[[ARG0]] : i64
+  // CHECK: %[[DIV0:.*]] = llvm.sdiv %[[ADD0]], %[[ARG0]] : i64
+  // CHECK: %[[ADD1:.*]] = llvm.add %[[DIV0]], %[[CST0]] : i64
+  // CHECK: %[[SUB0:.*]] = llvm.sub %[[CST1]], %[[ARG0]] : i64
+  // CHECK: %[[DIV1:.*]] = llvm.sdiv %[[SUB0]], %[[ARG0]] : i64
+  // CHECK: %[[SUB1:.*]] = llvm.sub %[[CST1]], %[[DIV1]] : i64
+  // CHECK: %[[CMP1:.*]] = llvm.icmp "slt" %[[ARG0]], %[[CST1]] : i64
+  // CHECK: %[[CMP2:.*]] = llvm.icmp "sgt" %[[ARG0]], %[[CST1]] : i64
+  // CHECK: %[[CMP3:.*]] = llvm.icmp "slt" %[[ARG0]], %[[CST1]] : i64
+  // CHECK: %[[CMP4:.*]] = llvm.icmp "sgt" %[[ARG0]], %[[CST1]] : i64
+  // CHECK: %[[AND0:.*]] = llvm.and %[[CMP1]], %[[CMP3]] : i1
+  // CHECK: %[[AND1:.*]] = llvm.and %[[CMP2]], %[[CMP4]] : i1
+  // CHECK: %[[OR:.*]] = llvm.or %[[AND0]], %[[AND1]] : i1
+  // CHECK: %[[SEL1:.*]] = llvm.select %[[OR]], %[[ADD1]], %[[SUB1]] : i1, i64
+  %0 = arith.ceildivsi %arg0, %arg0 : i64
+  return %0: i64
+}
+
+// CHECK-LABEL: @ceildivui
+// CHECK-SAME: %[[ARG0:.*]]: i32) -> i32
+func.func @ceildivui(%arg0 : i32) -> i32 {
+// CHECK: %[[CST0:.*]] = llvm.mlir.constant(0 : i32) : i32
+// CHECK: %[[CMP0:.*]] = llvm.icmp "eq" %[[ARG0]], %[[CST0]] : i32
+// CHECK: %[[CST1:.*]] = llvm.mlir.constant(1 : i32) : i32
+// CHECK: %[[SUB0:.*]] = llvm.sub %[[ARG0]], %[[CST1]] : i32
+// CHECK: %[[DIV0:.*]] = llvm.udiv %[[SUB0]], %[[ARG0]] : i32
+// CHECK: %[[ADD0:.*]] = llvm.add %[[DIV0]], %[[CST1]] : i32
+// CHECK: %[[SEL0:.*]] = llvm.select %[[CMP0]], %[[CST0]], %[[ADD0]] : i1, i32
+  %0 = arith.ceildivui %arg0, %arg0 : i32
+  return %0: i32
+}
+
+// -----
+
+// CHECK-LABEL: @floordivsi
+// CHECK-SAME: %[[ARG0:.*]]: i32, %[[ARG1:.*]]: i32) -> i32
+func.func @floordivsi(%arg0 : i32, %arg1 : i32) -> i32 {
+  // CHECK: %[[SDIV:.*]] = llvm.sdiv %[[ARG0]], %[[ARG1]] : i32
+  // CHECK: %[[MUL0:.*]] = llvm.mul %[[SDIV]], %[[ARG1]] : i32
+  // CHECK: %[[CMP0:.*]] = llvm.icmp "ne" %[[ARG0]], %[[MUL0]] : i32
+  // CHECK: %[[CST0:.*]] = llvm.mlir.constant(0 : i32) : i32
+  // CHECK: %[[CMP1:.*]] = llvm.icmp "slt" %[[ARG0]], %[[CST0]] : i32
+  // CHECK: %[[CMP2:.*]] = llvm.icmp "slt" %[[ARG1]], %[[CST0]] : i32
+  // CHECK: %[[CMP3:.*]] = llvm.icmp "ne" %[[CMP1]], %[[CMP2]] : i1
+  // CHECK: %[[AND:.*]] = llvm.and %[[CMP0]], %[[CMP3]] : i1
+  // CHECK: %[[CST1:.*]] = llvm.mlir.constant(-1 : i32) : i32
+  // CHECK: %[[ADD:.*]] = llvm.add %[[SDIV]], %[[CST1]] : i32
+  // CHECK: %[[SEL:.*]] = llvm.select %[[AND]], %[[ADD]], %[[SDIV]] : i1, i32
+  %0 = arith.floordivsi %arg0, %arg1 : i32
+  return %0 : i32
+}
+
+// -----
+
 // CHECK-LABEL: @minmaxi
 func.func @minmaxi(%arg0 : i32, %arg1 : i32) -> i32 {
   // CHECK: = llvm.intr.smin(%arg0, %arg1) : (i32, i32) -> i32

nujaa · 2024-11-27T07:52:16Z

Hey Hugo, thanks for sending this! This is marked as draft, so I presume not yet ready for reviewing?

Sorry I forgot to submit it after running the draft tests. 🙄

krzysz00

Given the context, I'll argue for mlir::arith::populateCeilFloorDivExpandOpsPatterns specifically.

The other "expand" patterns include things like expanding minsi or maxui, which have LLVM lowerings, and we don't want to add those here.

joker-eph · 2024-11-27T20:05:27Z

mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp

@@ -503,6 +505,7 @@ struct ArithToLLVMDialectInterface : public ConvertToLLVMPatternInterface {
  void populateConvertToLLVMConversionPatterns(
      ConversionTarget &target, LLVMTypeConverter &typeConverter,
      RewritePatternSet &patterns) const final {
+    arith::populateArithExpandOpsPatterns(patterns);
    arith::populateArithToLLVMConversionPatterns(typeConverter, patterns);
  }
 };


This pass is kind of deprecated: we're supposed to migrate to --convert-to-llvm.
I'm concerned by additions here that wouldn't carry over to --convert-to-llvm!

I am not completely sure of what you mean.
The tests mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir calls both convert-arith-to-llvm and --convert-to-llvm. If either arith-to-llvm or convert-to-llvm is updated, the other must be updated as well.

@nujaa , wouldn't adding this in "ConvertToLLVMPass.cpp" instead also work?

I'm confused because you're only changing the ArithToLLVMConversionPass here, so was this behavior already implemented in the convert-to-llvm flow and you're just catching up?

(I guess that makes my point as well somehow: we should remove the convert-arith-to-llvm pass: it does not provide anything that convert-to-llvm can't do, hopefully).

@nujaa , wouldn't adding this in "ConvertToLLVMPass.cpp" instead also work?

I think it is Arith specific and should not be part of generic ConvertToLLVMPass

so was this behavior already implemented in the convert-to-llvm flow and you're just catching up?

Neither arith-to-llvm nor convert-to-llvm was not expanding ops. As the test runs both with the same CHECK-lines.

…thToLLVM

nujaa · 2024-11-28T13:42:41Z

Given the context, I'll argue for mlir::arith::populateCeilFloorDivExpandOpsPatterns specifically.

The other "expand" patterns include things like expanding minsi or maxui, which have LLVM lowerings, and we don't want to add those here.

Good catch, thanks.

github-actions · 2024-11-28T13:45:36Z

✅ With the latest revision this PR passed the C/C++ code formatter.

krzysz00

Removing my hold

…vertArithToLLVM

RoboTux · 2024-12-04T10:14:04Z

A dependency on MLIRArithTransforms seems to be missing, CI is failing:

/usr/bin/ld: tools/mlir/lib/Conversion/ArithToLLVM/CMakeFiles/obj.MLIRArithToLLVM.dir/ArithToLLVM.cpp.o: in function (anonymous namespace)::ArithToLLVMDialectInterface::populateConvertToLLVMConversionPatterns(mlir::ConversionTarget&, mlir::LLVMTypeConverter&, mlir::RewritePatternSet&) const': ArithToLLVM.cpp:(.text._ZNK12_GLOBAL__N_127ArithToLLVMDialectInterface39populateConvertToLLVMConversionPatternsERN4mlir16ConversionTargetERNS1_17LLVMTypeConverterERNS1_17RewritePatternSetE+0x18): undefined reference to mlir::arith::populateCeilFloorDivExpandOpsPatterns(mlir::RewritePatternSet&)'
/usr/bin/ld: tools/mlir/lib/Conversion/ArithToLLVM/CMakeFiles/obj.MLIRArithToLLVM.dir/ArithToLLVM.cpp.o: in function (anonymous namespace)::ArithToLLVMConversionPass::runOnOperation()': ArithToLLVM.cpp:(.text._ZN12_GLOBAL__N_125ArithToLLVMConversionPass14runOnOperationEv+0x10c): undefined reference to mlir::arith::populateCeilFloorDivExpandOpsPatterns(mlir::RewritePatternSet&)'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

See:
https://lab.llvm.org/buildbot/#/builders/80/builds/7168
https://lab.llvm.org/buildbot/#/builders/130/builds/7036
https://lab.llvm.org/buildbot/#/builders/138/builds/7290

RoboTux · 2024-12-04T10:16:21Z

Another option is to move that code that into MLIRArithUtils if we do not want to depend on MLIRArithTransforms

Failing bot: * https://lab.llvm.org/buildbot/#/builders/138/builds/729 Also, not all discussions have been resolved: * llvm#117305 (comment) This reverts commit 2c739df.

banach-space · 2024-12-04T10:46:23Z

Reverted.

@nujaa , this shouldn't land while there's an ongoing design discussion on the suitable placement of these patterns.

EDIT

Just to clarify. I know @krzysz00 has already approved this.That was effectively LGTM without any qualification (we're missing "explicit" LGTM, but that's beside the point). From How Patch is Accepted:

When providing an unqualified LGTM (approval to commit), it is the responsibility of the reviewer to have reviewed all of the prior discussion and feedback from all reviewers ensuring that all feedback has been addressed and that all other reviewers will almost surely be satisfied with the patch being approved.

I just don't believe that all feedback has been addressed - especially given that the discussion continued post-LGTM :) And then the failing bot.

nujaa · 2024-12-04T10:55:06Z

@nujaa , this shouldn't land while there's an ongoing design discussion on the suitable placement of these patterns.

Yes, Sorry, I didn't see the upper comments until I merged following the approval and passing tests. My bad.

banach-space · 2024-12-04T11:00:26Z

Yes, Sorry, I didn't see the upper comments until I merged following the approval and passing tests. My bad.

No worries, I also find GitHub quite tricky to navigate. Note that we have a very liberal "revert" policy in LLVM - please don't let this discourage you from contributing! :)

nujaa · 2024-12-04T11:47:39Z

Alright. Thanks both for reverting, pointing it out and the motivation. I could not find guidelines on how to revert a commit without going through the MR review process. Do I simply push the revert commit without waiting for approval ?

Before I submit any fix, I would like to make sure of a few things :
To answer @joker-eph ,

I'm confused because you're only changing the ArithToLLVMConversionPass

If I am not mistaken, convert-to-llvm calls populateConvertToLLVMConversionPatterns implemented by a ConvertToLLVMPatternInterface extended for Arith behind the ArithToLLVMDialectInterface. This patch does adds a call to populateCeilFloorDivExpandOpsPatterns to both ArithToLLVMConversionPass (the deprecated pass) AND ArithToLLVMDialectInterface::populateConvertToLLVMConversionPatterns (the preferred one). I am not sure if I should do something else to mention it is part of convert-to-llvm.

wouldn't adding this in "ConvertToLLVMPass.cpp" instead also work?

I think ConvertToLLVMPass.cpp implements a shared interface among dialects to lower to LLVM and should not implement a requirement for some ops of a given dialect.
@banach-space , do you maybe mean adding CeilFloorDivExpandOpsPatterns to populateArithToLLVMConversionPatterns which is called in both ArithToLLVMConversionPass AND ArithToLLVMDialectInterface::populateConvertToLLVMConversionPatterns ? I agree it does factorize the code. Although, populateArithToLLVMConversionPatterns calls specifically lowerings of arith ops to LLVM of the type %OpName%Lowering. Whereas CeilFloorDivExpandOpsPatterns is not an op lowering to LLVM per se. I am convincible on this, you have the last word.

Thanks again all for your patience.

banach-space · 2024-12-04T14:27:34Z

I could not find guidelines on how to revert a commit without going through the MR review process.

There's a few relevant parts to consider here. First, the revert policy:

https://llvm.org/docs/DeveloperPolicy.html#patch-reversion-policy

And indeed, it does not discuss "how". However, note:

Reverts should be reasonably timely. A change submitted two hours ago can be reverted without prior discussion.

And then, under obtaining-commit-access

You are allowed to commit patches without approval which you think are obvious. This is clearly a subjective decision — we simply expect you to use good judgement.

From my experience, "reverts" are where you tend to 100% rely on your judgement - it's the easiest and quickest way to fix buildbot failures. In more complex situation (e.g. no buildbot breakage upstream, but some issues downstream), we tend use PRs. But even then, if a repro has been shared, folks tend to revert. This way patch authors are not under pressure to fix immediately (sometimes that's just physically not possible).

Thanks again all for your patience.

No worries Hugo, this is standard practice ;-)

banach-space · 2024-12-04T15:01:09Z

If I am not mistaken, convert-to-llvm calls populateConvertToLLVMConversionPatterns implemented by a ConvertToLLVMPatternInterface extended for Arith behind the ArithToLLVMDialectInterface.

OK, this is what we were missing :) And apologies, I forgot how -convert-to-llvm was wired-up.

Like you said, ConvertToLLVM invokes these populateConvertToLLVMConversionPatterns methods for every Dialect that implements ConvertToLLVMPatternInterface:

llvm-project/mlir/lib/Conversion/ConvertToLLVM/ConvertToLLVMPass.cpp

Lines 118 to 122 in 52b9d0b

    
           // Populate the patterns with the dialect interface. 
        
           if (failed(visitInterfaces([&](ConvertToLLVMPatternInterface *iface) { 
        
                 iface->populateConvertToLLVMConversionPatterns( 
        
                     *target, *typeConverter, tempPatterns); 
        
               })))

And that's what's being updated here. But you are also updating the -convert-arith-to-llvm path, right? In summary:

By updating ArithToLLVMDialectInterface, you are updating -convert-to-llvm.
By updating ArithToLLVMConversionPass, you keep -convert-artih-to-llvm in sync with -convert-to-llvm?

Is this accurate?

Arith Floor and Ceil ops would not get lowered when running --convert-arith-to-llvm.

Considering Mehdi's comment re this path being deprecated in favour of -convert-to-llvm, shouldn't this comment focus on -convert-to-llvm instead? Also, some element of this discussion should be included in the summary. We shouldn't be required to scan PR discussions to understand the rationale behind a particular change - that's what summaries are for ;-)

joker-eph · 2024-12-04T16:32:48Z

The confusion to me came from comments like:

I think it is Arith specific and should not be part of generic ConvertToLLVMPass

I think an answer that would have resolved the discussion immediately could have been along the line of:

this patch is actually plumbing the new pattern through both passes, since this is adding the call in ArithToLLVMDialectInterface as well. The test demonstrates the behavior is consistent between the two passes.

We should be all good now I think.

Arith Floor and Ceil ops would not get lowered when running --convert-arith-to-llvm.

… (Reland) (#118839) When running `convert-to-llvm`, `ceildiv` and `floordiv` ops, which do not have direct llvm conversion pattern, would not get lowered to llvm dialect. This patch adds CeilFloorDivExpandOpsPatterns to both `convert-to-llvm` and `arith-to-llvm` (deprecated) lowering those ops to lower level arith ops which can be lowered to llvm using LLVM conversion. Reland of #117305 after buildbot failures. See: https://lab.llvm.org/buildbot/#/builders/80/builds/7168 https://lab.llvm.org/buildbot/#/builders/130/builds/7036 https://lab.llvm.org/buildbot/#/builders/138/builds/7290 Added dependence to ArithTransforms in ArithToLLVM. In previous discussion, it has been suggested to move the CeilFloorDivExpandOpsPatterns to ArithUtils but I think linking ArithTransforms makes more sense as otherwise : * ArithToLLVM needs a new dependency to ArithUtils * ArithUtils needs new dependency to ArithTransforms or move the patterns as well which will create more dependencies * It creates lots of code motion which makes it hard to review.

nujaa added 4 commits November 20, 2024 10:11

[MLIR][Arith] Add ExpandOps to convertArithToLLVM

56988d2

fixup! [MLIR][Arith] Add ExpandOps to convertArithToLLVM

721de90

fixup! fixup! [MLIR][Arith] Add ExpandOps to convertArithToLLVM

a828f5b

fixup! fixup! fixup! [MLIR][Arith] Add ExpandOps to convertArithToLLVM

ef9a1ff

nujaa requested review from matthias-springer, banach-space, kuhar and Leporacanthicus November 22, 2024 09:29

kuhar requested review from krzysz00 and harsh-nod November 22, 2024 13:14

nujaa marked this pull request as ready for review November 27, 2024 07:51

llvmbot added the mlir label Nov 27, 2024

krzysz00 requested changes Nov 27, 2024

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joker-eph reviewed Nov 27, 2024

View reviewed changes

fixup! fixup! fixup! fixup! [MLIR][Arith] Add ExpandOps to convertAri…

e893579

…thToLLVM

krzysz00 self-requested a review December 2, 2024 18:06

krzysz00 approved these changes Dec 2, 2024

View reviewed changes

fixup! fixup! fixup! fixup! fixup! [MLIR][Arith] Add ExpandOps to con…

c92411f

…vertArithToLLVM

nujaa merged commit 2c739df into llvm:main Dec 4, 2024
8 checks passed

nujaa added a commit to nujaa/llvm-project that referenced this pull request Dec 5, 2024

[MLIR][Arith] Add ExpandOps to convertArithToLLVM (llvm#117305)

59b5712

Arith Floor and Ceil ops would not get lowered when running --convert-arith-to-llvm.

nujaa mentioned this pull request Dec 5, 2024

[MLIR][Arith] Add CeilFloorDivExpandOpsPatterns to conversion to LLVM (Reland) #118839

Merged

[MLIR][Arith] Add ExpandOps to convertArithToLLVM #117305

[MLIR][Arith] Add ExpandOps to convertArithToLLVM #117305

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