I forgot to include this in the earlier patch; is this ok for master (once the
pass is merged, of course)?
gcc/ChangeLog:
* doc/passes.texi: Document hardreg PRE pass.
diff --git a/gcc/doc/passes.texi b/gcc/doc/passes.texi
index
639f6b325c8be47bffd64269340c4dd8ea0f321c..5c2a174a7495404de48002f54902cce846e62b53
100644
--- a/gcc/doc/passes.texi
+++ b/gcc/doc/passes.texi
@@ -959,6 +959,11 @@ global constant and copy propagation.
The source file for this pass is @file{gcse.cc}, and the LCM routines
are in @file{lcm.cc}.
+A third version of this pass is run on some targets to optimise assignments to
+specific hard registers. This can be used in cases where a register has a
+single purpose, such as specifying a mode as an extra input for specific
+instructions (when these modes cannot be handled in the mode switching pass).
+
@item Loop optimization
This pass performs several loop related optimizations.
