[PATCH] D104061: [LangRef] clarify the meaning of noimplicitfloat

[Bob Haarman via Phabricator via llvm-commits]

inglorion created this revision.
inglorion added reviewers: efriedma, salim.nasser, rnk.
Herald added a subscriber: jdoerfert.
inglorion requested review of this revision.
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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.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104061

Files:
  llvm/docs/LangRef.rst


Index: llvm/docs/LangRef.rst
===================================================================
--- llvm/docs/LangRef.rst
+++ llvm/docs/LangRef.rst
@@ -1634,7 +1634,11 @@
     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 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


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