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(parent: 36ad792) | patch
re PR middle-end/29749 (Missing byte swap optimizations)
authorJakub Jelinek <jakub@redhat.com>
Mon, 3 Dec 2007 22:38:28 +0000 (23:38 +0100)
committerJakub Jelinek <jakub@gcc.gnu.org>
Mon, 3 Dec 2007 22:38:28 +0000 (23:38 +0100)
commit22164c3db7653556de1044be9491034c1c40bf8e
treebe824c8293ea6a41f93ef21d3fef35ab8fdd8e00tree
parent36ad7922cbf93f3601ab81b6b4d332fddf575a9fcommit | diff
re PR middle-end/29749 (Missing byte swap optimizations)

PR middle-end/29749
* fold-const.c (fold_binary) <case BIT_AND_EXPR>: Optimize
(X << C1) & C2 into (X << C1) & (C2 | ((1 << C1) - 1))
and (X >> C1) & C2 into (X >> C1) & (C2 | ~((type) -1 >> C1)).
(fold_binary) <case LSHIFT_EXPR, case RSHIFT_EXPR>: Optimize
(X & C2) << C1 into (X << C1) & (C2 << C1) and
(X & C2) >> C1 into (X >> C1) & (C2 >> C1) if that allows further
optimizations.

* gcc.dg/fold-rotate-1.c: New test.

From-SVN: r130589
gcc/ChangeLog diff | blob | history
gcc/fold-const.c diff | blob | history
gcc/testsuite/ChangeLog diff | blob | history
gcc/testsuite/gcc.dg/fold-rotate-1.c [new file with mode: 0644] blob