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[mlir][Arith] Prevent IR modification for non-matching pattern #150103

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Merged
merged 4 commits into from
Jul 22, 2025
Merged

[mlir][Arith] Prevent IR modification for non-matching pattern #150103

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864392b
[mlir][Arith] Prevent IR modification for non-matching pattern
krzysz00 Jul 22, 2025
7c1b38b
Remove a can't-happen match failure
krzysz00 Jul 22, 2025
e7b5116
Revert "Remove a can't-happen match failure"
krzysz00 Jul 22, 2025
93646f2
Add explanatory comment for guard, fix misc. whitespace issues
krzysz00 Jul 22, 2025
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10 changes: 3 additions & 7 deletions mlir/lib/Dialect/Arith/Transforms/ExpandOps.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -518,10 +518,10 @@ struct F4E2M1TruncFOpConverter : public OpRewritePattern<arith::TruncFOp> {
Type i32Ty = cloneToShapedType(operandTy, b.getI32Type());
Type f32Ty = cloneToShapedType(operandTy, b.getF32Type());

if (!isa<Float32Type>(operandETy))
operand = b.create<arith::ExtFOp>(f32Ty, operand);
if (!isa<Float4E2M1FNType>(resultETy))
return rewriter.notifyMatchFailure(op, "not a trunc of F4E2M1FN");
if (!isa<Float32Type>(operandETy))
operand = b.create<arith::ExtFOp>(f32Ty, operand);

Value c0x1 = createConst(loc, i4Ty, 1, rewriter);
Value c0x3 = createConst(loc, i4Ty, 3, rewriter);
Expand Down Expand Up @@ -657,11 +657,7 @@ struct ScalingExtFOpConverter : public OpRewritePattern<arith::ScalingExtFOp> {
scaleOperand = b.create<arith::TruncFOp>(scaleTy, scaleOperand, nullptr,
op.getFastmathAttr());
}
if (!llvm::isa<Float8E8M0FNUType>(scaleETy)) {
return rewriter.notifyMatchFailure(
op, "scaling_extf is using scales of type which can not be converted "
"to f8E8M0FNU");
}

Type resultTy = op.getType();
// extf on scale will essentially create floating point number
// of type resulTy that is 2^scale and will also propagate NaNs
Expand Down
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