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[libc][math] Fix some mis-optimization issue with hypotf16. #141960

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Merged
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May 29, 2025
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[libc][math] Fix some mis-optimization issue with hypotf16. #141960

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5 changes: 4 additions & 1 deletion libc/src/math/generic/hypotf16.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -48,10 +48,13 @@ LLVM_LIBC_FUNCTION(float16, hypotf16, (float16 x, float16 y)) {
return a_bits.get_val();
}

// TODO: Investigate why replacing the return line below with:
// return x_bits.get_val() + y_bits.get_val();
// fails the hypotf16 smoke tests.
if (LIBC_UNLIKELY(a_u - b_u >=
static_cast<uint16_t>((FPBits::FRACTION_LEN + 2)
<< FPBits::FRACTION_LEN)))
return x_abs.get_val() + y_abs.get_val();
return a_bits.get_val() + b_bits.get_val();

float af = fputil::cast<float>(a_bits.get_val());
float bf = fputil::cast<float>(b_bits.get_val());
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