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| author | Roger Sayle <roger@eyesopen.com> | 2003-01-16 01:06:33 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2003-01-16 01:06:33 +0000 |
| commit | a013431213f7f27e2866350c9aaea8f12046d81c (patch) | |
| tree | 2ecda5f756d588f0c8e2d12fbf3426b2b6eb164e /gcc/doc | |
| parent | 6b543e86f4a765f6a0b7be90e393b9a772c22a52 (diff) | |
| download | gcc-a013431213f7f27e2866350c9aaea8f12046d81c.zip gcc-a013431213f7f27e2866350c9aaea8f12046d81c.tar.gz gcc-a013431213f7f27e2866350c9aaea8f12046d81c.tar.bz2 | |
gcse.c (one_cprop_pass): Change function arguments to take both cprop_jumps and bypass_jumps flags...
* gcse.c (one_cprop_pass): Change function arguments to take both
cprop_jumps and bypass_jumps flags instead of just alter_jumps.
(gcse_main): Update calls to one_cprop_pass, disabling bypassing.
(bypass_jumps): New function to perform separate jump bypassing pass.
* rtl.h (bypass_jumps): Add function prototype.
* timevar.def (TV_BYPASS): New timing variable.
* toplev.c (enum dump_file_index): Add new entry DFI_bypass.
(dump_file): New entry for the bypass RTL dump file.
(rest_of_compilation): Insert new jump bypassing optimization
pass after loop.
* doc/passes.texi: Document new pass.
From-SVN: r61374
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/passes.texi | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/gcc/doc/passes.texi b/gcc/doc/passes.texi index 8a96a69..fe0fc2e 100644 --- a/gcc/doc/passes.texi +++ b/gcc/doc/passes.texi @@ -1,5 +1,5 @@ -@c Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2002, -@c 1999, 2000, 2001 Free Software Foundation, Inc. +@c Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, +@c 2000, 2001, 2002, 2003 Free Software Foundation, Inc. @c This is part of the GCC manual. @c For copying conditions, see the file gcc.texi. @@ -338,6 +338,19 @@ The option @option{-dL} causes a debugging dump of the RTL code after this pass. This dump file's name is made by appending @samp{.loop} to the input file name. +@cindex jump bypassing +@item +Jump bypassing. This pass is an aggressive form of GCSE that transforms +the control flow graph of a function by propagating constants into +conditional branch instructions. + +The source file for this pass is @file{gcse.c}. + +@opindex dG +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{.bypass} +to the input file name. + @item @opindex frerun-cse-after-loop If @option{-frerun-cse-after-loop} was enabled, a second common |