@file{cfgcleanup.c}, and there are support routines in @file{cfgrtl.c}
and @file{jump.c}.
+@item Forward propagation of single-def values
+
+This pass attempts to remove redundant computation by substituting
+variables that come from a single definition, and
+seeing if the result can be simplified. It performs copy propagation
+and addressing mode selection. The pass is run twice, with values
+being propagated into loops only on the second run. It is located in
+@file{fwprop.c}.
+
@item Common subexpression elimination
This pass removes redundant computation within basic blocks, and
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