diff --git a/zsl-golang/zsl/sha256/sha256block_amd64.go b/zsl-golang/zsl/sha256/sha256block_amd64.go
new file mode 100644
index 0000000..1c631af
--- /dev/null
+++ b/zsl-golang/zsl/sha256/sha256block_amd64.go
@@ -0,0 +1,7 @@
+package sha256
+
+import (
+	"golang.org/x/sys/cpu"
+)
+
+var useAVX2 = cpu.X86.HasAVX2 && cpu.X86.HasBMI2
diff --git a/zsl-golang/zsl/sha256/sha256block_amd64.s b/zsl-golang/zsl/sha256/sha256block_amd64.s
index 6ab3b52..12de75f 100644
--- a/zsl-golang/zsl/sha256/sha256block_amd64.s
+++ b/zsl-golang/zsl/sha256/sha256block_amd64.s
@@ -559,7 +559,9 @@
 	ADDL  y3, h                        // h = t1 + S0 + MAJ					// --
 
 TEXT ·block(SB), 0, $536-32
-	CMPB runtime·support_avx2(SB), $1
+//	CMPB runtime·support_avx2(SB), $1
+	CMPB ·useAVX2(SB), $1
+
 	JE   avx2
 
 	MOVQ p_base+8(FP), SI