diff options
| author | Daniel Dunbar <daniel@zuster.org> | 2008-12-04 09:05:45 +0000 |
|---|---|---|
| committer | Daniel Dunbar <daniel@zuster.org> | 2008-12-04 09:05:45 +0000 |
| commit | 2c4efe68ea698878f4041e7d8a335c01d8db2bbd (patch) | |
| tree | 60da558975f9717baf3bc3278003e2090b85ef2c /clang/lib | |
| parent | 8f723670ceda464982fcb8f8d3660e9c91ad75ad (diff) | |
| download | bcm5719-llvm-2c4efe68ea698878f4041e7d8a335c01d8db2bbd.tar.gz bcm5719-llvm-2c4efe68ea698878f4041e7d8a335c01d8db2bbd.zip | |
Mention an optimization opportunity pointed out by Chris.
llvm-svn: 60535
Diffstat (limited to 'clang/lib')
| -rw-r--r-- | clang/lib/CodeGen/README.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/clang/lib/CodeGen/README.txt b/clang/lib/CodeGen/README.txt index cda17ea97fc..56069dd99d2 100644 --- a/clang/lib/CodeGen/README.txt +++ b/clang/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. + +//===---------------------------------------------------------------------===// + |
