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[doc] Clarify constrained fcmps behavior 

Reviewed By: uweigand

Differential Revision: https://reviews.llvm.org/D101053
This commit is contained in:
Thomas Preud'homme 2021-04-22 13:17:42 +01:00
parent 2b15262f89
commit 2fdedf905a
1 changed files with 5 additions and 1 deletions
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6
llvm/docs/LangRef.rst
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@ -19285,7 +19285,11 @@ The quiet comparison operation performed by
'``llvm.experimental.constrained.fcmp``' will only raise an exception
if either operand is a SNAN. The signaling comparison operation
performed by '``llvm.experimental.constrained.fcmps``' will raise an
exception if either operand is a NAN (QNAN or SNAN).
exception if either operand is a NAN (QNAN or SNAN). Such an exception
does not preclude a result being produced (e.g. exception might only
set a flag), therefore the distinction between ordered and unordered
comparisons is also relevant for the
'``llvm.experimental.constrained.fcmps``' intrinsic.
'``llvm.experimental.constrained.fmuladd``' Intrinsic
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^