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[LangRef] clarify the meaning of noimplicitfloat

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Adds some more text to the documentation for the noimplicitfloat
function attribute. Hopefully, this makes it clearer what
qualifies an implicit vs. explicit float, without becoming overly
long or going into target-specific details.

Reviewed By: rnk, craig.topper

Differential Revision: https://reviews.llvm.org/D104061
This commit is contained in:
Bob Haarman 2021-06-10 12:03:16 -07:00
parent ab8f422ef7
commit f3d75b435d
1 changed files with 5 additions and 1 deletions
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docs/LangRef.rst
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@ -1635,7 +1635,11 @@ example:
memory on it's behalf. As a result, perhaps surprisingly, a ``nofree``
function can return a pointer to a previously deallocated memory object.
``noimplicitfloat``
This attributes disables implicit floating-point instructions.
Disallows implicit floating-point code. This inhibits optimizations that
use floating-point code and floating-point/SIMD/vector registers for
operations that are not nominally floating-point. LLVM instructions that
perform floating-point operations or require access to floating-point
registers may still cause floating-point code to be generated.
``noinline``
This attribute indicates that the inliner should never inline this
function in any situation. This attribute may not be used together