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| author | Geoffrey Keating <geoffk@apple.com> | 2002-12-05 01:05:13 +0000 |
|---|---|---|
| committer | Geoffrey Keating <geoffk@gcc.gnu.org> | 2002-12-05 01:05:13 +0000 |
| commit | 16823694d5a03199161bfb60157a9a6e3a2ee697 (patch) | |
| tree | a75fcb2170c99b7b343e9abad85d48152fdd43c2 /gcc/doc/md.texi | |
| parent | 76508852a0241db33b2512c0b460cdf06f7e0ce5 (diff) | |
| download | gcc-16823694d5a03199161bfb60157a9a6e3a2ee697.zip gcc-16823694d5a03199161bfb60157a9a6e3a2ee697.tar.gz gcc-16823694d5a03199161bfb60157a9a6e3a2ee697.tar.bz2 | |
Index: gcc/ChangeLog
2002-12-02 Geoffrey Keating <geoffk@apple.com>
* combine.c (combine_simplify_rtx): Add new canonicalizations.
* doc/md.texi (Insn Canonicalizations): Document new
canonicalizations for multiply/add combinations.
* config/rs6000/rs6000.md: Add and modify floating add/multiply
patterns to ensure they're used whenever they can be.
Index: gcc/testsuite/ChangeLog
2002-12-02 Geoffrey Keating <geoffk@apple.com>
* gcc.dg/ppc-fmadd-1.c: New file.
* gcc.dg/ppc-fmadd-2.c: New file.
* gcc.dg/ppc-fmadd-3.c: New file.
From-SVN: r59841
Diffstat (limited to 'gcc/doc/md.texi')
| -rw-r--r-- | gcc/doc/md.texi | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi index c4501ee..bc187c5 100644 --- a/gcc/doc/md.texi +++ b/gcc/doc/md.texi @@ -3670,6 +3670,14 @@ For these operators, if only one operand is a @code{neg}, @code{not}, @code{mult}, @code{plus}, or @code{minus} expression, it will be the first operand. +@item +In combinations of @code{neg}, @code{mult}, @code{plus}, and +@code{minus}, the @code{neg} operations (if any) will be moved inside +the operations as far as possible. For instance, +@code{(neg (mult A B))} is canonicalized as @code{(mult (neg A) B)}, but +@code{(plus (mult (neg A) B) C)} is canonicalized as +@code{(minus A (mult B C))}. + @cindex @code{compare}, canonicalization of @item For the @code{compare} operator, a constant is always the second operand |