diff options
| author | Jason Merrill <jason@redhat.com> | 2016-02-24 10:18:04 -0500 |
|---|---|---|
| committer | Jason Merrill <jason@gcc.gnu.org> | 2016-02-24 10:18:04 -0500 |
| commit | a021961c055d4d056d8bd7875a93c5e53450afd9 (patch) | |
| tree | 66d1ebef423cc0ae9ed52f94ce534df41312b6f8 /gcc/doc | |
| parent | 28577b86833bdb2e5241790f233fd2503ab4f880 (diff) | |
| download | gcc-a021961c055d4d056d8bd7875a93c5e53450afd9.zip gcc-a021961c055d4d056d8bd7875a93c5e53450afd9.tar.gz gcc-a021961c055d4d056d8bd7875a93c5e53450afd9.tar.bz2 | |
Add -flifetime-dse=1.
gcc/
* common.opt (flifetime-dse): Add -flifetime-dse=1.
gcc/cp/
* decl.c (start_preparsed_function): Condition ctor clobber on
flag_lifetime_dse > 1.
From-SVN: r233672
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 9ca3793..b8b2e70 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -6809,7 +6809,10 @@ value, and any changes during the lifetime of the object are dead when the object is destroyed. Normally dead store elimination will take advantage of this; if your code relies on the value of the object storage persisting beyond the lifetime of the object, you can use this -flag to disable this optimization. +flag to disable this optimization. To preserve stores before the +constructor starts (e.g. because your operator new clears the object +storage) but still treat the object as dead after the destructor you, +can use -flifetime-dse=1. @item -flive-range-shrinkage @opindex flive-range-shrinkage |