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| author | Paul Koning <ni1d@arrl.net> | 2018-07-12 15:02:57 -0400 |
|---|---|---|
| committer | Paul Koning <pkoning@gcc.gnu.org> | 2018-07-12 15:02:57 -0400 |
| commit | f9adcdecb2035ff8eb1b55428a1392b7d90503cc (patch) | |
| tree | 308f8d7a0bc50b32c84b8f5a53d48013bed3564f /gcc/doc/rtl.texi | |
| parent | e57aae39e0cc7f683980a1eaa593c0e48ec233b3 (diff) | |
| download | gcc-f9adcdecb2035ff8eb1b55428a1392b7d90503cc.zip gcc-f9adcdecb2035ff8eb1b55428a1392b7d90503cc.tar.gz gcc-f9adcdecb2035ff8eb1b55428a1392b7d90503cc.tar.bz2 | |
rtl.texi (REG_NONNEG): Remove decrement and branch until zero reference, add doloop_end instead.
* doc/rtl.texi (REG_NONNEG): Remove decrement and branch until
zero reference, add doloop_end instead.
* doc/md.texi (decrement_and_branch_until_zero): Remove.
(Looping patterns): Remove decrement_and_branch_until_zero. Add
detail for doloop_end.
From-SVN: r262603
Diffstat (limited to 'gcc/doc/rtl.texi')
| -rw-r--r-- | gcc/doc/rtl.texi | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/gcc/doc/rtl.texi b/gcc/doc/rtl.texi index b5410f9..a37d9ac 100644 --- a/gcc/doc/rtl.texi +++ b/gcc/doc/rtl.texi @@ -4151,11 +4151,11 @@ This means it appears in a @code{post_inc}, @code{pre_inc}, @findex REG_NONNEG @item REG_NONNEG The register @var{op} is known to have a nonnegative value when this -insn is reached. This is used so that decrement and branch until zero -instructions, such as the m68k dbra, can be matched. +insn is reached. This is used by special looping instructions +that terminate when the register goes negative. -The @code{REG_NONNEG} note is added to insns only if the machine -description has a @samp{decrement_and_branch_until_zero} pattern. +The @code{REG_NONNEG} note is added only to @samp{doloop_end} +insns, if its pattern uses a @code{ge} condition. @findex REG_LABEL_OPERAND @item REG_LABEL_OPERAND |