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-rw-r--r--gcc/common.opt4
1 files changed, 3 insertions, 1 deletions
diff --git a/gcc/common.opt b/gcc/common.opt
index 05e0fabe9013..6d98927fcc65 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2584,7 +2584,9 @@ trailing array.
funcse
Common Report Var(flag_uncse) Init(0) Optimization
-Undoing of CSE
+Undoing of CSE (common subexpression elimination).
+This allows to merge the common subexpression into
+its consuming instruction.
funit-at-a-time
Common Report Var(flag_unit_at_a_time) Init(1)