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lib/rbtree: use '+' instead of '|' for setting color.

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This has a slight benefit for x86 and has no effect on other targets.

The benefit to x86 is it change the codegen for setting a node to block
from `mov %r0, %r1; or $RB_BLACK, %r1` to `lea RB_BLACK(%r0), %r1` which
saves an instructions.

In all other cases it just replace ALU with ALU (or -> and) which
perform the same on all machines I am aware of.

Total instructions in rbtree.o:
    Before  - 802
    After   - 782

so it saves about 20 `mov` instructions.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Noah Goldstein <[email protected]>
Cc: Michel Lespinasse <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
This commit is contained in:
Noah Goldstein authored and Andrew Morton committed 2023-04-18 16:39:33 -07:00
1 parent 1be2edb25c
commit b0687c1119
2 files changed
+3 -3
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include/linux/rbtree_augmented.h
+2 -2
View File
@@ -156,13 +156,13 @@ RB_DECLARE_CALLBACKS(RBSTATIC, RBNAME, \
static inline void rb_set_parent(struct rb_node *rb, struct rb_node *p)
{
rb->__rb_parent_color = rb_color(rb) | (unsigned long)p;
rb->__rb_parent_color = rb_color(rb) + (unsigned long)p;
}
static inline void rb_set_parent_color(struct rb_node *rb,
struct rb_node *p, int color)
{
rb->__rb_parent_color = (unsigned long)p | color;
rb->__rb_parent_color = (unsigned long)p + color;
}
static inline void
lib/rbtree.c
+1 -1
View File
@@ -58,7 +58,7 @@
static inline void rb_set_black(struct rb_node *rb)
{
rb->__rb_parent_color |= RB_BLACK;
rb->__rb_parent_color += RB_BLACK;
}
static inline struct rb_node *rb_red_parent(struct rb_node *red)