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| author | jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4> | 2016-02-24 15:18:04 +0000 |
|---|---|---|
| committer | jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4> | 2016-02-24 15:18:04 +0000 |
| commit | 5065f8a09e2ee6d80e76546e17e45395012c118c (patch) | |
| tree | 66d1ebef423cc0ae9ed52f94ce534df41312b6f8 /gcc/doc | |
| parent | 29684344593e5532a8c3c19d1bc8cc165ca8ec4f (diff) | |
| download | gcc-5065f8a09e2ee6d80e76546e17e45395012c118c.tar.gz | |
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.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@233672 138bc75d-0d04-0410-961f-82ee72b054a4
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 9ca37936902..b8b2e7060d9 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 |