From: Rask Ingemann Lambertsen Date: Wed, 5 Sep 2007 19:47:56 +0000 (+0200) Subject: re PR web/32965 (missing documentation for -ftree-dse) X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e3d66ec31ed8c4df6e2123fb374756e6a28ddd2c;p=gcc.git re PR web/32965 (missing documentation for -ftree-dse) PR web/32965 PR tree-optimization/13756 * doc/invoke.texi (Options That Control Optimization): Document -ftree-dse. From-SVN: r128146 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 661db5a84e7..92eae311213 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2007-09-05 Rask Ingemann Lambertsen + + PR web/32965 + PR tree-optimization/13756 + * doc/invoke.texi (Options That Control Optimization): Document + -ftree-dse. + 2007-09-05 Uros Bizjak * gcc/config/i386/cpuid.h: New file. diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 734c8edfb45..1dce0b71ac8 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -5697,6 +5697,13 @@ simplification) based on a dominator tree traversal. This also performs jump threading (to reduce jumps to jumps). This flag is enabled by default at @option{-O} and higher. +@item -ftree-dse +@opindex ftree-dse +Perform dead store elimination (DSE) on trees. A dead store is a store into +a memory location which will later be overwritten by another store without +any intervening loads. In this case the earlier store can be deleted. This +flag is enabled by default at @option{-O} and higher. + @item -ftree-ch Perform loop header copying on trees. This is beneficial since it increases effectiveness of code motion optimizations. It also saves one jump. This flag