> clang supports expression statement syntax (a block inside parentheses) like
> GCC. This patch makes use of it.
Two further places where expression statements can be enabled in clang, for
better optimization:
2020-08-16 Bruno Haible <br...@clisp.org>
setenv: Use tree code also with clang.
* lib/setenv.c (USE_TSEARCH): Treat clang like GCC.
2020-08-16 Bruno Haible <br...@clisp.org>
math: Optimize signbit also on clang.
* lib/math.in.h (gl_signbitf, gl_signbitd, gl_signbitl): Optimize also
on clang.
>From ad3f6af5cea05a6aa9d6bf8588ef024d24f3b6ef Mon Sep 17 00:00:00 2001
From: Bruno Haible <br...@clisp.org>
Date: Sun, 16 Aug 2020 18:39:29 +0200
Subject: [PATCH 1/2] math: Optimize signbit also on clang.
* lib/math.in.h (gl_signbitf, gl_signbitd, gl_signbitl): Optimize also
on clang.
---
ChangeLog | 6 ++++++
lib/math.in.h | 2 +-
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/ChangeLog b/ChangeLog
index 81ed349..2e78c4f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
2020-08-16 Bruno Haible <br...@clisp.org>
+ math: Optimize signbit also on clang.
+ * lib/math.in.h (gl_signbitf, gl_signbitd, gl_signbitl): Optimize also
+ on clang.
+
+2020-08-16 Bruno Haible <br...@clisp.org>
+
avltreehash-list, rbtreehash-list: Optimize also on clang.
* lib/gl_anytreehash_list1.h (add_nodes_to_buckets): Use
__builtin_expect also on clang.
diff --git a/lib/math.in.h b/lib/math.in.h
index 99b7e32..0f67127 100644
--- a/lib/math.in.h
+++ b/lib/math.in.h
@@ -2536,7 +2536,7 @@ _GL_WARN_REAL_FLOATING_DECL (isnan);
_GL_EXTERN_C int gl_signbitf (float arg);
_GL_EXTERN_C int gl_signbitd (double arg);
_GL_EXTERN_C int gl_signbitl (long double arg);
-# if __GNUC__ >= 2 && !defined __STRICT_ANSI__
+# if (__GNUC__ >= 2 || defined __clang__) && !defined __STRICT_ANSI__
# define _GL_NUM_UINT_WORDS(type) \
((sizeof (type) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
# if defined FLT_SIGNBIT_WORD && defined FLT_SIGNBIT_BIT && !defined gl_signbitf
--
2.7.4
>From 5a459e1cf0deb13b90313da377fe6cb2d8ccff73 Mon Sep 17 00:00:00 2001
From: Bruno Haible <br...@clisp.org>
Date: Sun, 16 Aug 2020 18:39:33 +0200
Subject: [PATCH 2/2] setenv: Use tree code also with clang.
* lib/setenv.c (USE_TSEARCH): Treat clang like GCC.
---
ChangeLog | 5 +++++
lib/setenv.c | 2 +-
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/ChangeLog b/ChangeLog
index 2e78c4f..b750f34 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
2020-08-16 Bruno Haible <br...@clisp.org>
+ setenv: Use tree code also with clang.
+ * lib/setenv.c (USE_TSEARCH): Treat clang like GCC.
+
+2020-08-16 Bruno Haible <br...@clisp.org>
+
math: Optimize signbit also on clang.
* lib/math.in.h (gl_signbitf, gl_signbitd, gl_signbitl): Optimize also
on clang.
diff --git a/lib/setenv.c b/lib/setenv.c
index d03bc5a..aede703 100644
--- a/lib/setenv.c
+++ b/lib/setenv.c
@@ -72,7 +72,7 @@ __libc_lock_define_initialized (static, envlock)
values are from a small set. Outside glibc this will eat up all
memory after a while. */
#if defined _LIBC || (defined HAVE_SEARCH_H && defined HAVE_TSEARCH \
- && defined __GNUC__)
+ && (defined __GNUC__ || defined __clang__))
# define USE_TSEARCH 1
# include <search.h>
typedef int (*compar_fn_t) (const void *, const void *);
--
2.7.4
