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| -rw-r--r-- | lib/CodeGen/README.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/CodeGen/README.txt b/lib/CodeGen/README.txt index cda17ea97f..56069dd99d 100644 --- a/lib/CodeGen/README.txt +++ b/lib/CodeGen/README.txt @@ -18,3 +18,15 @@ directly. //===---------------------------------------------------------------------===// +It may be worth avoiding creation of alloca's for formal arguments +for the common situation where the argument is never written to or has +its address taken. The idea would be to begin generating code by using +the argument directly and if its address is taken or it is stored to +then generate the alloca and patch up the existing code. + +In theory, the same optimization could be a win for block local +variables as long as the declaration dominates all statements in the +block. + +//===---------------------------------------------------------------------===// + |