re PR other/36572 (Documentation for some options starting with “no-” not clear)

2018-11-08  Sandra Loosemore  <sandra@codesourcery.com>

	PR other/36572

	gcc/
	* doc/invoke.texi (Optimize Options): Clarify default behavior
	for -fno-sched-interblock and -fno-sched-spec.

From-SVN: r265939

gcc/ChangeLog

+2018-11-08  Sandra Loosemore  <sandra@codesourcery.com>
+
+	PR other/36572
+	* doc/invoke.texi (Optimize Options): Clarify default behavior
+	for -fno-sched-interblock and -fno-sched-spec.
+
 2018-11-08  Paul Koning  <ni1d@arrl.net>
 
 	* config/pdp11/constraints.md: Add "Z" series constraints for use

gcc/doc/invoke.texi

@@ -8632,14 +8632,14 @@ Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
 
 @item -fno-sched-interblock
 @opindex fno-sched-interblock
-Don't schedule instructions across basic blocks.  This is normally
-enabled by default when scheduling before register allocation, i.e.@:
+Disable instruction scheduling across basic blocks, which
+is normally enabled when scheduling before register allocation, i.e.@:
 with @option{-fschedule-insns} or at @option{-O2} or higher.
 
 @item -fno-sched-spec
 @opindex fno-sched-spec
-Don't allow speculative motion of non-load instructions.  This is normally
-enabled by default when scheduling before register allocation, i.e.@:
+Disable speculative motion of non-load instructions, which
+is normally enabled when scheduling before register allocation, i.e.@:
 with @option{-fschedule-insns} or at @option{-O2} or higher.
 
 @item -fsched-pressure