diff --git a/code/xvshuf_b.h b/code/xvshuf_b.h
index 18c7920..b283e8f 100644
--- a/code/xvshuf_b.h
+++ b/code/xvshuf_b.h
@@ -1,5 +1,7 @@
 for (int i = 0; i < 32; i++) {
-  if ((c.byte[i] % 32) < 16) {
+  if ((c.byte[i] % 256) >= 64 && MACHINE_3C5000) {
+    dst.byte[i] = 0;
+  } else if ((c.byte[i] % 32) < 16) {
     dst.byte[i] = b.byte[(c.byte[i] % 32) + ((i >= 16) ? 16 : 0)];
   } else {
     dst.byte[i] = a.byte[(c.byte[i] % 32) + ((i >= 16) ? 0 : -16)];
diff --git a/code/xvshuf_d.h b/code/xvshuf_d.h
index 62b4429..78ba621 100644
--- a/code/xvshuf_d.h
+++ b/code/xvshuf_d.h
@@ -1,5 +1,7 @@
 for (int i = 0; i < 4; i++) {
-  if ((a.dword[i] % 4) < 2) {
+  if ((a.dword[i] % 256) >= 64 && MACHINE_3C5000) {
+    dst.dword[i] = 0;
+  } else if ((a.dword[i] % 4) < 2) {
     dst.dword[i] = c.dword[(a.dword[i] % 4) + ((i >= 2) ? 2 : 0)];
   } else {
     dst.dword[i] = b.dword[(a.dword[i] % 4) + ((i >= 2) ? 0 : -2)];
diff --git a/code/xvshuf_h.h b/code/xvshuf_h.h
index a43cdc3..861911d 100644
--- a/code/xvshuf_h.h
+++ b/code/xvshuf_h.h
@@ -1,5 +1,7 @@
 for (int i = 0; i < 16; i++) {
-  if ((a.half[i] % 16) < 8) {
+  if ((a.half[i] % 256) >= 64 && MACHINE_3C5000) {
+    dst.half[i] = 0;
+  } else if ((a.half[i] % 16) < 8) {
     dst.half[i] = c.half[(a.half[i] % 16) + ((i >= 8) ? 8 : 0)];
   } else {
     dst.half[i] = b.half[(a.half[i] % 16) + ((i >= 8) ? 0 : -8)];
diff --git a/code/xvshuf_w.h b/code/xvshuf_w.h
index d3f27a5..a7f35ea 100644
--- a/code/xvshuf_w.h
+++ b/code/xvshuf_w.h
@@ -1,5 +1,7 @@
 for (int i = 0; i < 8; i++) {
-  if ((a.word[i] % 8) < 4) {
+  if ((a.word[i] % 256) >= 64 && MACHINE_3C5000) {
+    dst.word[i] = 0;
+  } else if ((a.word[i] % 8) < 4) {
     dst.word[i] = c.word[(a.word[i] % 8) + ((i >= 4) ? 4 : 0)];
   } else {
     dst.word[i] = b.word[(a.word[i] % 8) + ((i >= 4) ? 0 : -4)];