From: Junxian Zhu <zhujunxian@oss.cipunited.com>
Date: Tue, 6 Feb 2024 08:34:56 +0000 (+0800)
Subject: mips: Use builtins for ffs and ffsll
X-Git-Tag: glibc-2.40~408
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=545480506fc6576ea37a14e56c654935c691709d;p=thirdparty%2Fglibc.git

mips: Use builtins for ffs and ffsll

__builtin_ffs{,ll} basically on __builtin_ctz{,ll} in MIPS GCC compiler.
The hardware ctz instructions were available after MIPS{32,64} Release1. By using builtin ctz. It can also reduce code size of ffs/ffsll.

Checked on mips o32. mips64.

Signed-off-by: Junxian Zhu <zhujunxian@oss.cipunited.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: Maxim Kuvyrkov <maxim.kuvyrkov@linaro.org>
---

diff --git a/sysdeps/mips/math-use-builtins-ffs.h b/sysdeps/mips/math-use-builtins-ffs.h
new file mode 100644
index 00000000000..2ab6a03a168
--- /dev/null
+++ b/sysdeps/mips/math-use-builtins-ffs.h
@@ -0,0 +1,3 @@
+#include <sysdep.h>
+#define USE_FFS_BUILTIN (__mips_isa_rev >= 1)
+#define USE_FFSLL_BUILTIN (__mips_isa_rev >= 1)