Update the description of the llvm.fmuladd.* intrinsics to avoid use of the

[oota-llvm.git] / docs / LangRef.rst

diff --git a/docs/LangRef.rst b/docs/LangRef.rst
index 02c881bae65db85f0b2c1210e6b7e74d5675206b..d6cdbc4284b69b46c8109668aae0fd2b9114b6cb 100644 (file)
--- a/docs/LangRef.rst
+++ b/docs/LangRef.rst
@@ -7689,8 +7689,10 @@ Overview:
 """""""""
 
 The '``llvm.fmuladd.*``' intrinsic functions represent multiply-add
-expressions that can be fused if the code generator determines that the
-fused expression would be legal and efficient.
+expressions that can be fused if the code generator determines that (a) the
+target instruction set has support for a fused operation, and (b) that the
+fused operation is more efficient than the equivalent, separate pair of mul
+and add instructions.
 
 Arguments:
 """"""""""