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From: Sebastian Huber <sh@sourceware.org>
To: newlib-cvs@sourceware.org
Subject: [newlib-cygwin] Remove from RB_REMOVE_COLOR some null checks
Date: Mon, 26 Oct 2020 13:32:12 +0000 (GMT) [thread overview]
Message-ID: <20201026133212.E5FCB3894C34@sourceware.org> (raw)
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=123df813ee5a688545ce38367006241b1de20d7b
commit 123df813ee5a688545ce38367006241b1de20d7b
Author: dougm <dougm@FreeBSD.org>
Date: Tue Jun 2 17:18:16 2020 +0000
Remove from RB_REMOVE_COLOR some null checks
where the pointer checked is provably never null. Restructure the surrounding
code just enough to make the non-nullness obvious.
Reviewed by: markj
Tested by: pho
Differential Revision: https://reviews.freebsd.org/D25089
Diff:
---
newlib/libc/include/sys/tree.h | 46 ++++++++++++++++++------------------------
1 file changed, 20 insertions(+), 26 deletions(-)
diff --git a/newlib/libc/include/sys/tree.h b/newlib/libc/include/sys/tree.h
index d5adfdd4e..372c001b9 100644
--- a/newlib/libc/include/sys/tree.h
+++ b/newlib/libc/include/sys/tree.h
@@ -493,26 +493,23 @@ name##_RB_REMOVE_COLOR(struct name *head, struct type *parent) \
RB_ROTATE_LEFT(head, parent, tmp, field);\
tmp = RB_RIGHT(parent, field); \
} \
- if (!RB_ISRED(RB_LEFT(tmp, field), field) && \
- !RB_ISRED(RB_RIGHT(tmp, field), field)) { \
- RB_COLOR(tmp, field) = RB_RED; \
- elm = parent; \
- parent = RB_PARENT(elm, field); \
- continue; \
- } \
- if (!RB_ISRED(RB_RIGHT(tmp, field), field)) { \
+ if (RB_ISRED(RB_LEFT(tmp, field), field)) { \
struct type *oleft; \
- if ((oleft = RB_LEFT(tmp, field)) \
- != NULL) \
- RB_COLOR(oleft, field) = RB_BLACK; \
+ oleft = RB_LEFT(tmp, field); \
+ RB_COLOR(oleft, field) = RB_BLACK; \
RB_COLOR(tmp, field) = RB_RED; \
RB_ROTATE_RIGHT(head, tmp, oleft, field); \
tmp = RB_RIGHT(parent, field); \
+ } else if (!RB_ISRED(RB_RIGHT(tmp, field), field)) { \
+ RB_COLOR(tmp, field) = RB_RED; \
+ elm = parent; \
+ parent = RB_PARENT(elm, field); \
+ continue; \
} \
+ if (RB_ISRED(RB_RIGHT(tmp, field), field)) \
+ RB_COLOR(RB_RIGHT(tmp, field), field) = RB_BLACK; \
RB_COLOR(tmp, field) = RB_COLOR(parent, field); \
RB_COLOR(parent, field) = RB_BLACK; \
- if (RB_RIGHT(tmp, field)) \
- RB_COLOR(RB_RIGHT(tmp, field), field) = RB_BLACK; \
RB_ROTATE_LEFT(head, parent, tmp, field); \
elm = RB_ROOT(head); \
break; \
@@ -523,26 +520,23 @@ name##_RB_REMOVE_COLOR(struct name *head, struct type *parent) \
RB_ROTATE_RIGHT(head, parent, tmp, field);\
tmp = RB_LEFT(parent, field); \
} \
- if (!RB_ISRED(RB_LEFT(tmp, field), field) && \
- !RB_ISRED(RB_RIGHT(tmp, field), field)) { \
- RB_COLOR(tmp, field) = RB_RED; \
- elm = parent; \
- parent = RB_PARENT(elm, field); \
- continue; \
- } \
- if (!RB_ISRED(RB_LEFT(tmp, field), field)) { \
+ if (RB_ISRED(RB_RIGHT(tmp, field), field)) { \
struct type *oright; \
- if ((oright = RB_RIGHT(tmp, field)) \
- != NULL) \
- RB_COLOR(oright, field) = RB_BLACK; \
+ oright = RB_RIGHT(tmp, field); \
+ RB_COLOR(oright, field) = RB_BLACK; \
RB_COLOR(tmp, field) = RB_RED; \
RB_ROTATE_LEFT(head, tmp, oright, field); \
tmp = RB_LEFT(parent, field); \
+ } else if (!RB_ISRED(RB_LEFT(tmp, field), field)) { \
+ RB_COLOR(tmp, field) = RB_RED; \
+ elm = parent; \
+ parent = RB_PARENT(elm, field); \
+ continue; \
} \
+ if (RB_ISRED(RB_LEFT(tmp, field), field)) \
+ RB_COLOR(RB_LEFT(tmp, field), field) = RB_BLACK; \
RB_COLOR(tmp, field) = RB_COLOR(parent, field); \
RB_COLOR(parent, field) = RB_BLACK; \
- if (RB_LEFT(tmp, field)) \
- RB_COLOR(RB_LEFT(tmp, field), field) = RB_BLACK; \
RB_ROTATE_RIGHT(head, parent, tmp, field); \
elm = RB_ROOT(head); \
break; \
reply other threads:[~2020-10-26 13:32 UTC|newest]
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