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LangRef: Clarify behaviors of nsz in fast math flag #137567

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LangRef: Clarify behaviors of nsz in fast math flag #137567

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LangRef: Clarify nsz on min/max operations for +0.0 vs -0.0
wzssyqa Apr 28, 2025
918e5ac
Rewording
wzssyqa May 8, 2025
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4 changes: 4 additions & 0 deletions llvm/docs/LangRef.rst
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Expand Up @@ -3914,6 +3914,10 @@ following flags to enable otherwise unsafe floating-point transformations.
No Signed Zeros - Allow optimizations to treat the sign of a zero
argument or zero result as insignificant. This does not imply that -0.0
is poison and/or guaranteed to not exist in the operation.
Don't require +0.0>-0.0 for min/max operations - Allow optimizations of the
min/max operation not to treat +0.0>-0.0. Note the result should be either of
the operands. (max|min)(-0.0, -0.0) should never return +0.0, and vice versa.
Note: floating compare operations always imply -0.0 == +0.0.

Note: For :ref:`phi <i_phi>`, :ref:`select <i_select>`, and :ref:`call <i_call>`
instructions, the following return types are considered to be floating-point
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