[MLIR] Fix affine SSA id parser for values with numbers

[jeonghm9764]

module {
  func.func @main(%arg17: memref<1000xf32, strided<[?], offset: ?>>) -> memref<1x1000xf32> {
    %alloc_342 = memref.alloc() {alignment = 64 : i64} : memref<1x1x1000xf32>
    %alloc_343 = memref.alloc() {alignment = 64 : i64} : memref<1x1000xf32>
    affine.for %arg89 = 0 to 1 {
      affine.for %arg90 = 0 to 1000 {
        %0:2 = affine.delinearize_index %arg89 into (1, 1) : index, index
        %1 = affine.load %alloc_342[%0#0, %0#1, %arg90] : memref<1x1x1000xf32>
        %2 = affine.linearize_index disjoint [%arg89, %arg90] by (1, 1000) : index
        %3 = affine.load %arg17[%2] : memref<1000xf32, strided<[?], offset: ?>>
        %4 = arith.addf %1, %3 : f32
        affine.store %4, %alloc_343[%arg89, %arg90] : memref<1x1000xf32>
      }
    }
    return %alloc_343 : memref<1x1000xf32>
  }
}

mlir-opt test.mlir
error: expected ']' in affine map
        %1 = affine.load %alloc_342[%0#0, %0#1, %arg90] : memref<1x1x1000xf32>

It seems that there is a bug in affine.load operation's affine map of SSA ids handling where its values are numbered. (%0#0, %0#1, ...) dimsAndSymbols in AffineParser only takes the name of the value %0, but not #0, and thinks %0 is already parsed when checking redundancy for %0#1. I am not sure if checking for redundancy is necessary here, but removing the check works.

[github-actions]

Thank you for submitting a Pull Request (PR) to the LLVM Project!

This PR will be automatically labeled and the relevant teams will be notified.

If you wish to, you can add reviewers by using the "Reviewers" section on this page.

If this is not working for you, it is probably because you do not have write permissions for the repository. In which case you can instead tag reviewers by name in a comment by using @ followed by their GitHub username.

If you have received no comments on your PR for a week, you can request a review by "ping"ing the PR by adding a comment “Ping”. The common courtesy "ping" rate is once a week. Please remember that you are asking for valuable time from other developers.

If you have further questions, they may be answered by the LLVM GitHub User Guide.

You can also ask questions in a comment on this PR, on the LLVM Discord or on the forums.

[llvmbot]

@llvm/pr-subscribers-mlir-core

Author: Paul Jeong (jeonghm9764)

Changes

module {
  func.func @<!-- -->main(%arg17: memref&lt;1000xf32, strided&lt;[?], offset: ?&gt;&gt;) -&gt; memref&lt;1x1000xf32&gt; {
    %alloc_342 = memref.alloc() {alignment = 64 : i64} : memref&lt;1x1x1000xf32&gt;
    %alloc_343 = memref.alloc() {alignment = 64 : i64} : memref&lt;1x1000xf32&gt;
    affine.for %arg89 = 0 to 1 {
      affine.for %arg90 = 0 to 1000 {
        %0:2 = affine.delinearize_index %arg89 into (1, 1) : index, index
        %1 = affine.load %alloc_342[%0#<!-- -->0, %0#<!-- -->1, %arg90] : memref&lt;1x1x1000xf32&gt;
        %2 = affine.linearize_index disjoint [%arg89, %arg90] by (1, 1000) : index
        %3 = affine.load %arg17[%2] : memref&lt;1000xf32, strided&lt;[?], offset: ?&gt;&gt;
        %4 = arith.addf %1, %3 : f32
        affine.store %4, %alloc_343[%arg89, %arg90] : memref&lt;1x1000xf32&gt;
      }
    }
    return %alloc_343 : memref&lt;1x1000xf32&gt;
  }
}


error: expected ']' in affine map
        %1 = affine.load %alloc_342[%0#<!-- -->0, %0#<!-- -->1, %arg90] : memref&lt;1x1x1000xf32&gt;

It seems that there is a bug in affine.load operation's affine map of SSA ids handling where its values are numbered. (%0#0, %0#1, ...) dimsAndSymbols in AffineParser only takes the name of the value %0, but not #0, and thinks %0 is already parsed when checking redundancy for %0#1. I am not sure if checking for redundancy is necessary here, but removing the check works.

---

Full diff: https://github.com/llvm/llvm-project/pull/168175.diff

1 Files Affected:

• (modified) mlir/lib/AsmParser/AffineParser.cpp (-7)

diff --git a/mlir/lib/AsmParser/AffineParser.cpp b/mlir/lib/AsmParser/AffineParser.cpp
index 1797611858c06..8f7fa3877aa18 100644
--- a/mlir/lib/AsmParser/AffineParser.cpp
+++ b/mlir/lib/AsmParser/AffineParser.cpp
@@ -311,13 +311,6 @@ AffineExpr AffineParser::parseSSAIdExpr(bool isSymbol) {
   if (getToken().isNot(Token::percent_identifier))
     return emitWrongTokenError("expected ssa identifier"), nullptr;
   auto name = getTokenSpelling();
-  // Check if we already parsed this SSA id.
-  for (auto entry : dimsAndSymbols) {
-    if (entry.first == name) {
-      consumeToken(Token::percent_identifier);
-      return entry.second;
-    }
-  }
   // Parse the SSA id and add an AffineDim/SymbolExpr to represent it.
   if (parseElement(isSymbol))
     return nullptr;

[llvmbot]

@llvm/pr-subscribers-mlir

Author: Paul Jeong (jeonghm9764)

Changes

module {
  func.func @<!-- -->main(%arg17: memref&lt;1000xf32, strided&lt;[?], offset: ?&gt;&gt;) -&gt; memref&lt;1x1000xf32&gt; {
    %alloc_342 = memref.alloc() {alignment = 64 : i64} : memref&lt;1x1x1000xf32&gt;
    %alloc_343 = memref.alloc() {alignment = 64 : i64} : memref&lt;1x1000xf32&gt;
    affine.for %arg89 = 0 to 1 {
      affine.for %arg90 = 0 to 1000 {
        %0:2 = affine.delinearize_index %arg89 into (1, 1) : index, index
        %1 = affine.load %alloc_342[%0#<!-- -->0, %0#<!-- -->1, %arg90] : memref&lt;1x1x1000xf32&gt;
        %2 = affine.linearize_index disjoint [%arg89, %arg90] by (1, 1000) : index
        %3 = affine.load %arg17[%2] : memref&lt;1000xf32, strided&lt;[?], offset: ?&gt;&gt;
        %4 = arith.addf %1, %3 : f32
        affine.store %4, %alloc_343[%arg89, %arg90] : memref&lt;1x1000xf32&gt;
      }
    }
    return %alloc_343 : memref&lt;1x1000xf32&gt;
  }
}


error: expected ']' in affine map
        %1 = affine.load %alloc_342[%0#<!-- -->0, %0#<!-- -->1, %arg90] : memref&lt;1x1x1000xf32&gt;

It seems that there is a bug in affine.load operation's affine map of SSA ids handling where its values are numbered. (%0#0, %0#1, ...) dimsAndSymbols in AffineParser only takes the name of the value %0, but not #0, and thinks %0 is already parsed when checking redundancy for %0#1. I am not sure if checking for redundancy is necessary here, but removing the check works.

---

Full diff: https://github.com/llvm/llvm-project/pull/168175.diff

1 Files Affected:

• (modified) mlir/lib/AsmParser/AffineParser.cpp (-7)

diff --git a/mlir/lib/AsmParser/AffineParser.cpp b/mlir/lib/AsmParser/AffineParser.cpp
index 1797611858c06..8f7fa3877aa18 100644
--- a/mlir/lib/AsmParser/AffineParser.cpp
+++ b/mlir/lib/AsmParser/AffineParser.cpp
@@ -311,13 +311,6 @@ AffineExpr AffineParser::parseSSAIdExpr(bool isSymbol) {
   if (getToken().isNot(Token::percent_identifier))
     return emitWrongTokenError("expected ssa identifier"), nullptr;
   auto name = getTokenSpelling();
-  // Check if we already parsed this SSA id.
-  for (auto entry : dimsAndSymbols) {
-    if (entry.first == name) {
-      consumeToken(Token::percent_identifier);
-      return entry.second;
-    }
-  }
   // Parse the SSA id and add an AffineDim/SymbolExpr to represent it.
   if (parseElement(isSymbol))
     return nullptr;