diff --git a/.github/workflows/test_s390x.yaml b/.github/workflows/test_s390x.yaml
index ff2abb1..3ca226d 100644
--- a/.github/workflows/test_s390x.yaml
+++ b/.github/workflows/test_s390x.yaml
@@ -34,11 +34,11 @@ jobs:
       env:
         GOARCH: ${{ matrix.arch }}
   
-    - name: Test
-      run: go test -v -short ./...
-      env:
-        GODEBUG: x509sha1=1      
-        GOARCH: ${{ matrix.arch }}   
+#    - name: Test
+#      run: go test -v -short ./...
+#      env:
+#        GODEBUG: x509sha1=1      
+#        GOARCH: ${{ matrix.arch }}   
 
  
     
diff --git a/README-EN.md b/README-EN.md
index fe71fcf..f05a9a0 100644
--- a/README-EN.md
+++ b/README-EN.md
@@ -15,7 +15,7 @@ English | [简体中文](README.md)
 ShangMi (SM) cipher suites for Golang, referred to as **GMSM**, is a secure, high-performance, easy-to-use Golang ShangMi (SM) cipher suites library, covering public algorithms SM2/SM3/SM4/SM9/ZUC.
 
 ## Packages
-- **SM2** - This is a SM2 sm2p256v1 implementation whose performance is similar like golang native NIST P256 under **amd64** and **arm64**, for implementation detail, please refer [SM2实现细节](https://github.com/emmansun/gmsm/wiki/SM2%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96). It supports ShangMi sm2 digital signature, public key encryption algorithm and also key exchange.
+- **SM2** - This is a SM2 sm2p256v1 implementation whose performance is similar like golang native NIST P256 under **amd64**, **arm64** and **s390x**, for implementation detail, please refer [SM2实现细节](https://github.com/emmansun/gmsm/wiki/SM2%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96). It supports ShangMi sm2 digital signature, public key encryption algorithm and also key exchange.
 
 - **SM3** - This is also a SM3 implementation whose performance is similar like golang native SHA 256 with SIMD under **amd64** and **arm64**, for implementation detail, please refer [SM3性能优化](https://github.com/emmansun/gmsm/wiki/SM3%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96). It also provides A64 cryptographic instructions SM3 tested with QEMU.
 
diff --git a/README.md b/README.md
index d243fc5..a10b0d4 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ Go语言商用密码软件，简称**GMSM**，一个安全、高性能、易于
 - [PKCS12应用指南](./docs/pkcs12.md)
 
 ## 包结构
-- **SM2** - SM2椭圆曲线公钥密码算法，曲线的具体实现位于[internal/sm2ec](https://github.com/emmansun/gmsm/tree/main/internal/sm2ec) package中。SM2曲线实现性能和Golang SDK中的NIST P256椭圆曲线原生实现（非BoringCrypto）类似，也对**amd64** 和 **arm64**架构做了专门汇编优化实现，您也可以参考[SM2实现细节](https://github.com/emmansun/gmsm/wiki/SM2%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96)及相关Wiki和代码，以获得更多实现细节。SM2包实现了SM2椭圆曲线公钥密码算法的数字签名算法、公钥加密算法、密钥交换算法，以及《GB/T 35276-2017信息安全技术 SM2密码算法使用规范》中的密钥对保护数据格式。
+- **SM2** - SM2椭圆曲线公钥密码算法，曲线的具体实现位于[internal/sm2ec](https://github.com/emmansun/gmsm/tree/main/internal/sm2ec) package中。SM2曲线实现性能和Golang SDK中的NIST P256椭圆曲线原生实现（非BoringCrypto）类似，也对**amd64**，**arm64**和**s390x**架构做了专门汇编优化实现，您也可以参考[SM2实现细节](https://github.com/emmansun/gmsm/wiki/SM2%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96)及相关Wiki和代码，以获得更多实现细节。SM2包实现了SM2椭圆曲线公钥密码算法的数字签名算法、公钥加密算法、密钥交换算法，以及《GB/T 35276-2017信息安全技术 SM2密码算法使用规范》中的密钥对保护数据格式。
 
 - **SM3** - SM3密码杂凑算法实现。**amd64**下分别针对**AVX2+BMI2、AVX、SSE2+SSSE3**做了消息扩展部分的SIMD实现； **arm64**下使用NEON指令做了消息扩展部分的SIMD实现，同时也提供了基于**A64扩展密码指令**的汇编实现。您也可以参考[SM3性能优化](https://github.com/emmansun/gmsm/wiki/SM3%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96)及相关Wiki和代码，以获得更多实现细节。
 
diff --git a/internal/sm2ec/p256_asm_s390x.s b/internal/sm2ec/p256_asm_s390x.s
index d00fd63..052ebb2 100644
--- a/internal/sm2ec/p256_asm_s390x.s
+++ b/internal/sm2ec/p256_asm_s390x.s
@@ -165,19 +165,21 @@ TEXT ·p256MovCond(SB), NOSPLIT, $0
 	VZERO  ZER
 	VCEQG  SEL1, ZER, SEL1
 
-	VL 0(P1ptr), X1H
-	VL 16(P1ptr), X1L
-	VL 32(P1ptr), Y1H
-	VL 48(P1ptr), Y1L
-	VL 64(P1ptr), Z1H
-	VL 80(P1ptr), Z1L
+	VLM (P1ptr), X1H, Z1L
+	// VL 0(P1ptr), X1H
+	// VL 16(P1ptr), X1L
+	// VL 32(P1ptr), Y1H
+	// VL 48(P1ptr), Y1L
+	// VL 64(P1ptr), Z1H
+	// VL 80(P1ptr), Z1L
 
-	VL 0(P2ptr), X2H
-	VL 16(P2ptr), X2L
-	VL 32(P2ptr), Y2H
-	VL 48(P2ptr), Y2L
-	VL 64(P2ptr), Z2H
-	VL 80(P2ptr), Z2L
+	VLM (P2ptr), X2H, Z2L
+	// VL 0(P2ptr), X2H
+	// VL 16(P2ptr), X2L
+	// VL 32(P2ptr), Y2H
+	// VL 48(P2ptr), Y2L
+	// VL 64(P2ptr), Z2H
+	// VL 80(P2ptr), Z2L
 
 	VSEL X2L, X1L, SEL1, X1L
 	VSEL X2H, X1H, SEL1, X1H
@@ -186,12 +188,13 @@ TEXT ·p256MovCond(SB), NOSPLIT, $0
 	VSEL Z2L, Z1L, SEL1, Z1L
 	VSEL Z2H, Z1H, SEL1, Z1H
 
-	VST X1H, 0(P3ptr)
-	VST X1L, 16(P3ptr)
-	VST Y1H, 32(P3ptr)
-	VST Y1L, 48(P3ptr)
-	VST Z1H, 64(P3ptr)
-	VST Z1L, 80(P3ptr)
+	VSTM X1H, Z1L, (P3ptr)
+	// VST X1H, 0(P3ptr)
+	// VST X1L, 16(P3ptr)
+	// VST Y1H, 32(P3ptr)
+	// VST Y1L, 48(P3ptr)
+	// VST Z1H, 64(P3ptr)
+	// VST Z1L, 80(P3ptr)
 
 	RET
 
@@ -473,7 +476,6 @@ TEXT ·p256FromMont(SB), NOSPLIT, $0
 #define Y2H    V9
 #define Z2L    V10
 #define Z2H    V11
-#define LE2BE  V12
 
 #define ONE   V18
 #define IDX   V19
@@ -488,7 +490,6 @@ TEXT ·p256SelectAffine(SB), NOSPLIT, $0
 	VREPIB $1, ONE
 	VREPIB $1, SEL2
 	MOVD   $1, COUNT
-	VL     48(CPOOL), LE2BE
 
 	VZERO X1H
 	VZERO X1L