diff --git a/0018-Sw64-Port-Change-libdir-from-lib-to-lib64.patch b/0018-Sw64-Port-Change-libdir-from-lib-to-lib64.patch
new file mode 100644
index 0000000000000000000000000000000000000000..d605acaa6d60dd46c1f575fe914be22d00093c1d
--- /dev/null
+++ b/0018-Sw64-Port-Change-libdir-from-lib-to-lib64.patch
@@ -0,0 +1,47 @@
+From be59fcdbd80538828613b78b76e3813d46748ab9 Mon Sep 17 00:00:00 2001
+From: wangy <wangy@example.com>
+Date: Wed, 14 May 2025 18:56:45 +0800
+Subject: [PATCH] SW_64: Change libdir from lib to lib64, and rename the
+ dynamic linker from ld-linux.so.2 to ld-linux-sw-64.so.2.
+
+---
+ gcc/config/sw_64/linux-elf.h | 2 +-
+ gcc/config/sw_64/sw_64.h     | 3 +++
+ gcc/config/sw_64/t-linux     | 4 +++-
+ 3 files changed, 7 insertions(+), 2 deletions(-)
+
+diff --git a/gcc/config/sw_64/linux-elf.h b/gcc/config/sw_64/linux-elf.h
+index 0013db73fd5..3ec5643bb1f 100644
+--- a/gcc/config/sw_64/linux-elf.h
++++ b/gcc/config/sw_64/linux-elf.h
+@@ -23,6 +23,6 @@ along with GCC; see the file COPYING3.  If not see
+ #define EXTRA_SPECS {"elf_dynamic_linker", ELF_DYNAMIC_LINKER},
+ 
+-#define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
++#define GLIBC_DYNAMIC_LINKER	"/lib64/ld-linux-sw-64.so.2"
+ #define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0"
+ #if DEFAULT_LIBC == LIBC_UCLIBC
+ #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
+diff --git a/gcc/config/sw_64/sw_64.h b/gcc/config/sw_64/sw_64.h
+index e6d789ab3fd..d695eb4bacb 100644
+--- a/gcc/config/sw_64/sw_64.h
++++ b/gcc/config/sw_64/sw_64.h
+@@ -1054,3 +1054,6 @@ int enable_asan_check_stack();
+ #undef SW_64_ENABLE_FULL_ASAN
+ #define SW_64_ENABLE_ASAN 0
+ #endif
++#define STANDARD_STARTFILE_PREFIX_1 "/lib64/"
++
++#define STANDARD_STARTFILE_PREFIX_2 "/usr/lib64/"
+diff --git a/gcc/config/sw_64/t-linux b/gcc/config/sw_64/t-linux
+index d78ef47dfaf..916a3a079ad 100644
+--- a/gcc/config/sw_64/t-linux
++++ b/gcc/config/sw_64/t-linux
+@@ -1 +1,3 @@
+-MULTIARCH_DIRNAME = $(call if_multiarch,sw_64-linux-gnu)
++MULTILIB_DIRNAMES = 64
++
++MULTILIB_OSDIRNAMES = .=../lib64$(call if_multiarch,:sw_64-linux-gnu)
+-- 
+2.18.1
+
diff --git a/gcc.spec b/gcc.spec
index 9da07ba14964421cc55572ff0a68d8681a823ed8..a3d3d1f8c7494df98d2bb56c2dbc25222e9c0b64 100644
--- a/gcc.spec
+++ b/gcc.spec
@@ -2,7 +2,7 @@
 %global gcc_major 12
 # Note, gcc_release must be integer, if you want to add suffixes to
 # %%{release}, append them after %%{gcc_release} on Release: line.
-%global gcc_release 99
+%global gcc_release 100
 
 %global _unpackaged_files_terminate_build 0
 %global _performance_build 1
@@ -532,6 +532,7 @@ Patch1014: 0014-Sw64-Port-add-lex-builtin-support-in-libcpp.patch
 Patch1015: 0015-Sw64-Port-libsanitizer.patch
 Patch1016: 0016-libsanitizer-fix-isoc23-function-interception.patch
 Patch1017: 0017-Sw64-Port-Fix-target-explicit_mask.patch
+Patch1018: 0018-Sw64-Port-Change-libdir-from-lib-to-lib64.patch
 %endif
 
 # Part 3000 ~ 4999
@@ -1719,6 +1720,7 @@ not stable, so plugins must be rebuilt any time GCC is updated.
 %patch -P1015 -p1
 %patch -P1016 -p1
 %patch -P1017 -p1
+%patch -P1018 -p1
 %endif
 
 %ifarch loongarch64
@@ -2157,7 +2159,7 @@ CONFIGURE_OPTS="\
 	   --enable-default-pie
 %endif
 %ifarch sw_64
-	--with-cpu=sw6b --disable-libquadmath --disable-multilib \
+	--with-cpu=sw8a --disable-libquadmath --disable-multilib \
 	--enable-tls
 %endif
 %ifarch ppc64le
@@ -2245,7 +2247,6 @@ mkdir -p rpm.doc/changelogs/{gcc/cp,gcc/ada,gcc/jit,libstdc++-v3,libobjc,libgomp
 for i in {gcc,gcc/cp,gcc/ada,gcc/jit,libstdc++-v3,libobjc,libgomp,libcc1,libatomic,libsanitizer}/ChangeLog*; do
 	cp -p $i rpm.doc/changelogs/$i
 done
-
 (cd gcc/fortran; for i in ChangeLog*; do
 	cp -p $i ../../rpm.doc/gfortran/$i
 done)
@@ -4327,6 +4328,11 @@ end
 %doc rpm.doc/changelogs/libcc1/ChangeLog*
 
 %changelog
+* Mon Oct 20 2025 swcompiler <lc@wxiat.com> - 12.3.1-100
+- Type: Sw64
+- DESC:
+- Sw64-Port-Change-libdir-from-lib-to-lib64.
+
 * Wed Aug 27 2025 Hu,Lin1 <lin1.hu@intel.com> - 12.3.1-99
 - Type: Sync
 - DESC: Sync patch from openeuler/gcc.