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Remove redundant sign/zero extension for SIMD broadcasts #108824

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merged 3 commits into from
Nov 25, 2024
Merged

Remove redundant sign/zero extension for SIMD broadcasts #108824

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01735f3
Remove redundant sign/zero extension for SIMD broadcasts
EgorBo Oct 13, 2024
be5d178
don't do it for minopts
EgorBo Oct 13, 2024
d18be88
Merge branch 'main' into opt-extension-broadcasts
EgorBo Nov 21, 2024
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16 changes: 16 additions & 0 deletions src/coreclr/jit/lowerxarch.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -10356,6 +10356,22 @@ void Lowering::ContainCheckHWIntrinsic(GenTreeHWIntrinsic* node)

op1 = node->Op(1);
op1->ClearContained();

// Drop GT_CAST if it doesn't change the op1's bits we're about to broadcast
if (op1->OperIs(GT_CAST) && !op1->gtOverflow() && comp->opts.Tier0OptimizationEnabled())
{
GenTreeCast* cast = op1->AsCast();
if (!varTypeIsFloating(cast->CastToType()) &&
!varTypeIsFloating(cast->CastFromType()) &&
Comment on lines +10394 to +10395
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Should this rather check for varTypeIsInteger on both?

We have several types (integer, floating, simd, and mask) so a negative test may accidentally include the wrong things

(genTypeSize(cast->CastToType()) >= genTypeSize(simdBaseType)) &&
(genTypeSize(cast->CastFromType()) >= genTypeSize(simdBaseType)))
{
BlockRange().Remove(op1);
op1 = cast->CastOp();
op1->ClearContained();
node->Op(1) = op1;
}
}
}
}
break;
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