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| author | Segher Boessenkool <segher@gcc.gnu.org> | 2019-11-06 01:06:23 +0100 |
|---|---|---|
| committer | Segher Boessenkool <segher@gcc.gnu.org> | 2019-11-06 01:06:23 +0100 |
| commit | 8cb0906b0fa9c07095db1ec7fb22eaeecf5075af (patch) | |
| tree | 1421225fbcbe4b01b27184e7a8e78fa0dff29cf9 /gcc | |
| parent | b7689b962dd6536bbb2567bfdec52e35109af7ab (diff) | |
| download | gcc-8cb0906b0fa9c07095db1ec7fb22eaeecf5075af.zip gcc-8cb0906b0fa9c07095db1ec7fb22eaeecf5075af.tar.gz gcc-8cb0906b0fa9c07095db1ec7fb22eaeecf5075af.tar.bz2 | |
doc: Insn splitting by combine
The combine pass is perfectly happy if a splitter splits to just one
instruction (instead of two).
* doc/md.texi (Insn Splitting): Fix combiner documentation.
From-SVN: r277866
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/doc/md.texi | 2 |
2 files changed, 6 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 8ee23dd..63ef711 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,4 +1,8 @@ -2019-10-26 Jason Merrill <jason@redhat.com> +2019-11-05 Segher Boessenkool <segher@kernel.crashing.org> + + * doc/md.texi (Insn Splitting): Fix combiner documentation. + +2019-11-05 Jason Merrill <jason@redhat.com> PR tree-optimization/91825 * expmed.c: Reduce -Wmaybe-uninitialized to warning. diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi index 859ebed..19d6893 100644 --- a/gcc/doc/md.texi +++ b/gcc/doc/md.texi @@ -8371,7 +8371,7 @@ case that the pattern is @emph{not} matched by any @code{define_insn}. The combiner pass first tries to split a single @code{set} expression and then the same @code{set} expression inside a @code{parallel}, but followed by a @code{clobber} of a pseudo-reg to use as a scratch -register. In these cases, the combiner expects exactly two new insn +register. In these cases, the combiner expects exactly one or two new insn patterns to be generated. It will verify that these patterns match some @code{define_insn} definitions, so you need not do this test in the @code{define_split} (of course, there is no point in writing a |