On 01/22/2016 12:03 PM, Ian Lance Taylor wrote:
Index: common.opt
===================================================================
--- common.opt (revision 232580)
+++ common.opt (working copy)
@@ -1380,6 +1380,10 @@
Enable hoisting adjacent loads to encourage generating conditional move
instructions.
+fkeep-gc-roots-live
+Common Report Var(flag_keep_gc_roots_live) Optimization
+Always keep a pointer to a live memory block
+
I think these option descriptions are supposed to end in a period.
floop-parallelize-all
Common Report Var(flag_loop_parallelize_all) Optimization
Mark all loops as parallel.
Index: doc/invoke.texi
===================================================================
--- doc/invoke.texi (revision 232580)
+++ doc/invoke.texi (working copy)
@@ -359,7 +359,7 @@
-fno-ira-share-spill-slots @gol
-fisolate-erroneous-paths-dereference -fisolate-erroneous-paths-attribute @gol
-fivopts -fkeep-inline-functions -fkeep-static-functions @gol
--fkeep-static-consts -flive-range-shrinkage @gol
+-fkeep-static-consts -fkeep-gc-roots-live -flive-range-shrinkage @gol
It looks like this list is supposed to be alphabetized, in which case
the new one should be inserted before -fkeep-inline-functions, not after
-fkeep-static-consts.
@@ -6621,6 +6621,17 @@
If you use @option{-Wunsafe-loop-optimizations}, the compiler warns you
if it finds this kind of loop.
+@item -fkeep-gc-roots-live
+@opindex fkeep-gc-roots-live
+This option tells the compiler that a garbage collector will be used,
+and that therefore the compiled code must retain a live pointer into
+all memory blocks. The compiler is permitted to construct a pointer
+that is outside the bounds of a memory block, but it must ensure that
+given a pointer into memory, some pointer into that memory remains
+live in the compiled code whenever it is live in the source code.
+This option is disabled by default for most languages, enabled by
+default for languages that use garbage collection.
+
This is OK.
Someone else will have to review the code parts of the patch.
-Sandra
