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* doc/passes.texi: Mention the other register allocator.

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Michael Matz 2002-11-28 20:53:45 +00:00 committed by Michael Matz
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@ -1,3 +1,7 @@
2002-11-28 Michael Matz <matz@suse.de>
* doc/passes.texi: Mention the other register allocator.
2002-11-28 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.md (6 new peephole2 patterns): New.

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gcc/doc/passes.texi
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@ -459,13 +459,20 @@ The option @option{-dS} causes a debugging dump of the RTL code after this
pass is run for the first time. The dump file's name is made by
appending @samp{.sched} to the input file name.
@cindex register allocation
@item
Register allocation. These passes make sure that all occurences of pseudo
registers are eliminated, either by allocating them to a hard register,
replacing them by an equivalent expression (e.g.@: a constant) or by placing
them on the stack. This is done in several subpasses:
@itemize @bullet
@cindex register class preference pass
@item
Register class preferencing. The RTL code is scanned to find out
which register class is best for each pseudo register. The source
file is @file{regclass.c}.
@cindex register allocation
@cindex local register allocation
@item
Local register allocation (@file{local-alloc.c}). This pass allocates
@ -484,6 +491,17 @@ Global register allocation (@file{global.c}). This pass
allocates hard registers for the remaining pseudo registers (those
whose life spans are not contained in one basic block).
@cindex graph coloring register allocation
@opindex fnew-ra
@opindex dl
@item
Graph coloring register allocator. The files @file{ra.c}, @file{ra-build.c},
@file{ra-colorize.c}, @file{ra-debug.c}, @file{ra-rewrite.c} together with
the header @file{ra.h} contain another register allocator, which is used
when the option @option{-fnew-ra} is given. In that case it is run instead
of the above mentioned local and global register allocation passes, and the
option @option{-dl} causes a debugging dump of its work.
@cindex reloading
@item
Reloading. This pass renumbers pseudo registers with the hardware
@ -505,6 +523,7 @@ Source files are @file{reload.c} and @file{reload1.c}, plus the header
The option @option{-dg} causes a debugging dump of the RTL code after
this pass. This dump file's name is made by appending @samp{.greg} to
the input file name.
@end itemize
@cindex instruction scheduling
@cindex scheduling, instruction