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| author | Jeff Law <law@redhat.com> | 2014-12-05 15:19:26 -0700 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 2014-12-05 15:19:26 -0700 |
| commit | 40da08e0dd91017678b20cb1db2cb529f64d33df (patch) | |
| tree | 673e584210a9a8bbf3173baa1a15f58525ccf2f3 | |
| parent | 4b97b9f771161b0096bb5f120ccd64b084148d6b (diff) | |
| download | gcc-40da08e0dd91017678b20cb1db2cb529f64d33df.zip gcc-40da08e0dd91017678b20cb1db2cb529f64d33df.tar.gz gcc-40da08e0dd91017678b20cb1db2cb529f64d33df.tar.bz2 | |
md.texi: Note problems using function calls to determine insn lengths and point readers...
* doc/md.texi: Note problems using function calls to determine
insn lengths and point readers to a potential workaround.
From-SVN: r218439
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/doc/md.texi | 6 |
2 files changed, 11 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 9538737..0dcf649 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2014-12-05 Jeff Law <law@redhat.com> + + * doc/md.texi: Note problems using function calls to determine + insn lengths and point readers to a potential workaround. + 2014-12-05 Andreas Schwab <schwab@linux-m68k.org> * combine.c (is_parallel_of_n_reg_sets) diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi index b8e5ac5..1c70a77 100644 --- a/gcc/doc/md.texi +++ b/gcc/doc/md.texi @@ -8345,6 +8345,12 @@ the number of vectors multiplied by the size of each vector. Lengths are measured in addressable storage units (bytes). +Note that it is possible to call functions via the @code{symbol_ref} +mechanism to compute the length of an insn. However, if you use this +mechanism you must provide dummy clauses to express the maximum length +without using the function call. You can an example of this in the +@code{pa} machine description for the @code{call_symref} pattern. + The following macros can be used to refine the length computation: @table @code |