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| author | mmitchel <mmitchel@138bc75d-0d04-0410-961f-82ee72b054a4> | 1999-05-26 09:38:33 +0000 |
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| committer | mmitchel <mmitchel@138bc75d-0d04-0410-961f-82ee72b054a4> | 1999-05-26 09:38:33 +0000 |
| commit | ebfc0cc62480c089a23c4242ae18afc0bc787380 (patch) | |
| tree | 806352f5e68f4ec08bbf248aadd9ec6eab580b26 /gcc/gcc.texi | |
| parent | 869973e1c2b2f127e1993f71cfd08f88278a35f0 (diff) | |
| download | gcc-ebfc0cc62480c089a23c4242ae18afc0bc787380.tar.gz | |
* gcc.texi (Passes): Document branch-shortening.
* invoke.texi (Debugging Options): Document the fact that `-dp'
outputs length information for instructions.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@27167 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/gcc.texi')
| -rw-r--r-- | gcc/gcc.texi | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc/gcc.texi b/gcc/gcc.texi index 16828160c32..0e8cb983cde 100644 --- a/gcc/gcc.texi +++ b/gcc/gcc.texi @@ -3563,6 +3563,15 @@ The option @samp{-dd} causes a debugging dump of the RTL code after this pass. This dump file's name is made by appending @samp{.dbr} to the input file name. +@cindex branch shortening +@item +Branch shortening. On many RISC machines, branch instructions have a +limited range. Thus, longer sequences of instructions must be used for +long branches. In this pass, the compiler figures out what how far each +instruction will be from each other instruction, and therefore whether +the usual instructions, or the longer sequences, must be used for each +branch. + @cindex register-to-stack conversion @item Conversion from usage of some hard registers to usage of a register |