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[MLIR][LLVM] Fix #llvm.constant_range crashing in storage uniquer #135772

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Merged
merged 4 commits into from
Apr 16, 2025
Merged

[MLIR][LLVM] Fix #llvm.constant_range crashing in storage uniquer #135772

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9a1bb3e
[MLIR][LLVM] Fix #llvm.constant_range crashing in storage uniquer
Jezurko Apr 14, 2025
de30d07
fixup! [MLIR][LLVM] Fix #llvm.constant_range crashing in storage uniquer
Jezurko Apr 15, 2025
8b59fe5
fixup! [MLIR][LLVM] Fix #llvm.constant_range crashing in storage uniquer
Jezurko Apr 15, 2025
d8b04e6
fixup! [MLIR][LLVM] Fix #llvm.constant_range crashing in storage uniquer
Jezurko Apr 16, 2025
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5 changes: 2 additions & 3 deletions mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td
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Original file line number Diff line number Diff line change
Expand Up @@ -1094,9 +1094,8 @@ def LLVM_TBAATagArrayAttr
// ConstantRangeAttr
//===----------------------------------------------------------------------===//
def LLVM_ConstantRangeAttr : LLVM_Attr<"ConstantRange", "constant_range"> {
let parameters = (ins
"::llvm::APInt":$lower,
"::llvm::APInt":$upper
let parameters = (ins APIntParameter<"">:$lower,
APIntParameter<"">:$upper
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@River707 River707 Apr 15, 2025

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Suggested change
let parameters = (ins APIntParameter<"">:$lower,
APIntParameter<"">:$upper
let parameters = (ins
APIntParameter<"">:$lower,
APIntParameter<"">:$upper

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@xlauko xlauko Apr 15, 2025

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I found only:

We discussed with @gysit in side channel that it might be worthwhile to add a check to tablegen to warn on APInt use and suggest APIntParameter instead.

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@River707 River707 Apr 15, 2025

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One conceptual alternative to that I suppose, would be to detect APInt and use APIntParameter equivalent logic instead. Either way, would be nice to remove a footgun.

);
let summary = "A range of two integers, corresponding to LLVM's ConstantRange";
let description = [{
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6 changes: 6 additions & 0 deletions mlir/include/mlir/IR/AttrTypeBase.td
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Expand Up @@ -383,6 +383,12 @@ class StringRefParameter<string desc = "", string value = ""> :
let defaultValue = value;
}

// For APInts, which require comparison over different bitwidths
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@gysit gysit Apr 16, 2025

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// For APInts, which require comparison over different bitwidths
// For APInts, which require comparison supporting different bitwidths. The default
// APInt comparison operator asserts when the bitwidths differ, so a custom
// implementation is necessary.

nit: Let's maybe expand a bit why this is necessary.

class APIntParameter<string desc> :
AttrOrTypeParameter<"::llvm::APInt", desc> {
let comparator = "$_lhs.getBitWidth() == $_rhs.getBitWidth() && $_lhs == $_rhs";
}

// For APFloats, which require comparison.
class APFloatParameter<string desc> :
AttrOrTypeParameter<"::llvm::APFloat", desc> {
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10 changes: 10 additions & 0 deletions mlir/test/Dialect/LLVMIR/range-attr.mlir
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@@ -0,0 +1,10 @@
// RUN: mlir-opt %s -o - | FileCheck %s

// CHECK: #llvm.constant_range<i32, 0, 12>
llvm.func external @foo1(!llvm.ptr, i64) -> (i32 {llvm.range = #llvm.constant_range<i32, 0, 12>})
// CHECK: #llvm.constant_range<i8, 1, 10>
llvm.func external @foo2(!llvm.ptr, i64) -> (i8 {llvm.range = #llvm.constant_range<i8, 1, 10>})
// CHECK: #llvm.constant_range<i64, 0, 2147483648>
llvm.func external @foo3(!llvm.ptr, i64) -> (i64 {llvm.range = #llvm.constant_range<i64, 0, 2147483648>})
// CHECK: #llvm.constant_range<i32, 1, -2147483648>
llvm.func external @foo4(!llvm.ptr, i64) -> (i32 {llvm.range = #llvm.constant_range<i32, 1, -2147483648>})
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