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| author | Christoph Hellwig <hch@lst.de> | 2011-07-08 14:36:05 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2011-07-08 14:36:05 +0200 |
| commit | 69ef921b55cc3788d1d2a27b33b27d04acd0090a (patch) | |
| tree | bcc7c1f4b7f15628f122dfdb96f8d4d37f587e92 /fs/xfs/xfs_btree.c | |
| parent | 218106a1104c598011e5df9d9aac7e0416be03e6 (diff) | |
| download | linux-69ef921b55cc3788d1d2a27b33b27d04acd0090a.tar.gz linux-69ef921b55cc3788d1d2a27b33b27d04acd0090a.tar.bz2 linux-69ef921b55cc3788d1d2a27b33b27d04acd0090a.zip | |
xfs: byteswap constants instead of variables
Micro-optimize various comparisms by always byteswapping the constant
instead of the variable, which allows to do the swap at compile instead
of runtime.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Diffstat (limited to 'fs/xfs/xfs_btree.c')
| -rw-r--r-- | fs/xfs/xfs_btree.c | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/fs/xfs/xfs_btree.c b/fs/xfs/xfs_btree.c index 2f9e97c128a0..43125af42629 100644 --- a/fs/xfs/xfs_btree.c +++ b/fs/xfs/xfs_btree.c @@ -66,11 +66,11 @@ xfs_btree_check_lblock( be16_to_cpu(block->bb_numrecs) <= cur->bc_ops->get_maxrecs(cur, level) && block->bb_u.l.bb_leftsib && - (be64_to_cpu(block->bb_u.l.bb_leftsib) == NULLDFSBNO || + (block->bb_u.l.bb_leftsib == cpu_to_be64(NULLDFSBNO) || XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_leftsib))) && block->bb_u.l.bb_rightsib && - (be64_to_cpu(block->bb_u.l.bb_rightsib) == NULLDFSBNO || + (block->bb_u.l.bb_rightsib == cpu_to_be64(NULLDFSBNO) || XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_rightsib))); if (unlikely(XFS_TEST_ERROR(!lblock_ok, mp, @@ -105,10 +105,10 @@ xfs_btree_check_sblock( be16_to_cpu(block->bb_level) == level && be16_to_cpu(block->bb_numrecs) <= cur->bc_ops->get_maxrecs(cur, level) && - (be32_to_cpu(block->bb_u.s.bb_leftsib) == NULLAGBLOCK || + (block->bb_u.s.bb_leftsib == cpu_to_be32(NULLAGBLOCK) || be32_to_cpu(block->bb_u.s.bb_leftsib) < agflen) && block->bb_u.s.bb_leftsib && - (be32_to_cpu(block->bb_u.s.bb_rightsib) == NULLAGBLOCK || + (block->bb_u.s.bb_rightsib == cpu_to_be32(NULLAGBLOCK) || be32_to_cpu(block->bb_u.s.bb_rightsib) < agflen) && block->bb_u.s.bb_rightsib; if (unlikely(XFS_TEST_ERROR(!sblock_ok, cur->bc_mp, @@ -511,9 +511,9 @@ xfs_btree_islastblock( block = xfs_btree_get_block(cur, level, &bp); xfs_btree_check_block(cur, block, level, bp); if (cur->bc_flags & XFS_BTREE_LONG_PTRS) - return be64_to_cpu(block->bb_u.l.bb_rightsib) == NULLDFSBNO; + return block->bb_u.l.bb_rightsib == cpu_to_be64(NULLDFSBNO); else - return be32_to_cpu(block->bb_u.s.bb_rightsib) == NULLAGBLOCK; + return block->bb_u.s.bb_rightsib == cpu_to_be32(NULLAGBLOCK); } /* @@ -777,14 +777,14 @@ xfs_btree_setbuf( b = XFS_BUF_TO_BLOCK(bp); if (cur->bc_flags & XFS_BTREE_LONG_PTRS) { - if (be64_to_cpu(b->bb_u.l.bb_leftsib) == NULLDFSBNO) + if (b->bb_u.l.bb_leftsib == cpu_to_be64(NULLDFSBNO)) cur->bc_ra[lev] |= XFS_BTCUR_LEFTRA; - if (be64_to_cpu(b->bb_u.l.bb_rightsib) == NULLDFSBNO) + if (b->bb_u.l.bb_rightsib == cpu_to_be64(NULLDFSBNO)) cur->bc_ra[lev] |= XFS_BTCUR_RIGHTRA; } else { - if (be32_to_cpu(b->bb_u.s.bb_leftsib) == NULLAGBLOCK) + if (b->bb_u.s.bb_leftsib == cpu_to_be32(NULLAGBLOCK)) cur->bc_ra[lev] |= XFS_BTCUR_LEFTRA; - if (be32_to_cpu(b->bb_u.s.bb_rightsib) == NULLAGBLOCK) + if (b->bb_u.s.bb_rightsib == cpu_to_be32(NULLAGBLOCK)) cur->bc_ra[lev] |= XFS_BTCUR_RIGHTRA; } } @@ -795,9 +795,9 @@ xfs_btree_ptr_is_null( union xfs_btree_ptr *ptr) { if (cur->bc_flags & XFS_BTREE_LONG_PTRS) - return be64_to_cpu(ptr->l) == NULLDFSBNO; + return ptr->l == cpu_to_be64(NULLDFSBNO); else - return be32_to_cpu(ptr->s) == NULLAGBLOCK; + return ptr->s == cpu_to_be32(NULLAGBLOCK); } STATIC void @@ -923,12 +923,12 @@ xfs_btree_ptr_to_daddr( union xfs_btree_ptr *ptr) { if (cur->bc_flags & XFS_BTREE_LONG_PTRS) { - ASSERT(be64_to_cpu(ptr->l) != NULLDFSBNO); + ASSERT(ptr->l != cpu_to_be64(NULLDFSBNO)); return XFS_FSB_TO_DADDR(cur->bc_mp, be64_to_cpu(ptr->l)); } else { ASSERT(cur->bc_private.a.agno != NULLAGNUMBER); - ASSERT(be32_to_cpu(ptr->s) != NULLAGBLOCK); + ASSERT(ptr->s != cpu_to_be32(NULLAGBLOCK)); return XFS_AGB_TO_DADDR(cur->bc_mp, cur->bc_private.a.agno, be32_to_cpu(ptr->s)); |