diff options
Diffstat (limited to 'lib/Transforms/IPO/ArgumentPromotion.cpp')
-rw-r--r-- | lib/Transforms/IPO/ArgumentPromotion.cpp | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/lib/Transforms/IPO/ArgumentPromotion.cpp b/lib/Transforms/IPO/ArgumentPromotion.cpp index 93a7af68a0..85b29f871f 100644 --- a/lib/Transforms/IPO/ArgumentPromotion.cpp +++ b/lib/Transforms/IPO/ArgumentPromotion.cpp @@ -9,22 +9,22 @@ // // This pass promotes "by reference" arguments to be "by value" arguments. In // practice, this means looking for internal functions that have pointer -// arguments. If we can prove, through the use of alias analysis, that an -// argument is *only* loaded, then we can pass the value into the function +// arguments. If it can prove, through the use of alias analysis, that an +// argument is *only* loaded, then it can pass the value into the function // instead of the address of the value. This can cause recursive simplification // of code and lead to the elimination of allocas (especially in C++ template // code like the STL). // // This pass also handles aggregate arguments that are passed into a function, // scalarizing them if the elements of the aggregate are only loaded. Note that -// we refuse to scalarize aggregates which would require passing in more than -// three operands to the function, because we don't want to pass thousands of -// operands for a large array or structure! +// it refuses to scalarize aggregates which would require passing in more than +// three operands to the function, because passing thousands of operands for a +// large array or structure is unprofitable! // // Note that this transformation could also be done for arguments that are only -// stored to (returning the value instead), but we do not currently handle that -// case. This case would be best handled when and if we start supporting -// multiple return values from functions. +// stored to (returning the value instead), but does not currently. This case +// would be best handled when and if LLVM begins supporting multiple return +// values from functions. // //===----------------------------------------------------------------------===// |