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| -rw-r--r-- | llvm/docs/LangRef.rst | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst index 59c4469fb9f..5e2d627d886 100644 --- a/llvm/docs/LangRef.rst +++ b/llvm/docs/LangRef.rst @@ -1786,7 +1786,8 @@ example: requires strict floating-point semantics. LLVM will not attempt any optimizations that require assumptions about the floating-point rounding mode or that might alter the state of floating-point status flags that - might otherwise be set or cleared by calling this function. + might otherwise be set or cleared by calling this function. LLVM will + not introduce any new floating-point instructions that may trap. ``"thunk"`` This attribute indicates that the function will delegate to some other function with a tail call. The prototype of a thunk should not be used for @@ -15155,6 +15156,17 @@ example, a series of FP operations that each may raise exceptions may be vectorized into a single instruction that raises each unique exception a single time. +Required Function Attributes: +""""""""""""""""""""""""""""" + +Proper :ref:`function attributes <fnattrs>` usage is required for the +constrained intrinsics to function correctly. + +All function *calls* done in a function that uses constrained floating +point intrinsics must have the ``strictfp`` attribute. + +All function *definitions* that use constrained floating point intrinsics +must have the ``strictfp`` attribute. '``llvm.experimental.constrained.fadd``' Intrinsic ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
