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Adding a clarifying comment as to why HWIntrinsicInfo::lookupIval returns an inverted comparison op #35867

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May 6, 2020
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Adding a clarifying comment as to why HWIntrinsicInfo::lookupIval returns an inverted comparison op #35867

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20 changes: 20 additions & 0 deletions src/coreclr/src/jit/hwintrinsic.h
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Original file line number Diff line number Diff line change
Expand Up @@ -328,6 +328,11 @@ struct HWIntrinsicInfo
return static_cast<int>(FloatComparisonMode::OrderedGreaterThanSignaling);
}

// CompareGreaterThan is not directly supported in hardware without AVX support.
// We will return the inverted case here and lowering will itself swap the ops
// to ensure the emitted code remains correct. This simplifies the overall logic
// here and for other use cases.

assert(id != NI_AVX_CompareGreaterThan);
return static_cast<int>(FloatComparisonMode::OrderedLessThanSignaling);
}
Expand All @@ -352,6 +357,11 @@ struct HWIntrinsicInfo
return static_cast<int>(FloatComparisonMode::OrderedGreaterThanOrEqualSignaling);
}

// CompareGreaterThanOrEqual is not directly supported in hardware without AVX support.
// We will return the inverted case here and lowering will itself swap the ops
// to ensure the emitted code remains correct. This simplifies the overall logic
// here and for other use cases.

assert(id != NI_AVX_CompareGreaterThanOrEqual);
return static_cast<int>(FloatComparisonMode::OrderedLessThanOrEqualSignaling);
}
Expand Down Expand Up @@ -385,6 +395,11 @@ struct HWIntrinsicInfo
return static_cast<int>(FloatComparisonMode::UnorderedNotGreaterThanSignaling);
}

// CompareNotGreaterThan is not directly supported in hardware without AVX support.
// We will return the inverted case here and lowering will itself swap the ops
// to ensure the emitted code remains correct. This simplifies the overall logic
// here and for other use cases.

assert(id != NI_AVX_CompareNotGreaterThan);
return static_cast<int>(FloatComparisonMode::UnorderedNotLessThanSignaling);
}
Expand All @@ -409,6 +424,11 @@ struct HWIntrinsicInfo
return static_cast<int>(FloatComparisonMode::UnorderedNotGreaterThanOrEqualSignaling);
}

// CompareNotGreaterThanOrEqual is not directly supported in hardware without AVX support.
// We will return the inverted case here and lowering will itself swap the ops
// to ensure the emitted code remains correct. This simplifies the overall logic
// here and for other use cases.

assert(id != NI_AVX_CompareNotGreaterThanOrEqual);
return static_cast<int>(FloatComparisonMode::UnorderedNotLessThanOrEqualSignaling);
}
Expand Down