1 files changed, 24 insertions, 0 deletions
diff --git a/riscv/insns/vbrev_v.h b/riscv/insns/vbrev_v.h
new file mode 100644
index 0000000..7f784c2
--- /dev/null
+++ b/riscv/insns/vbrev_v.h
@@ -0,0 +1,24 @@
+// vbrev.v vd, vs2
+
+#include "zvk_ext_macros.h"
+
+require_zvbb;
+
+VI_V_ULOOP
+({
+  reg_t x = vs2;
+
+  // Reverse bits in bytes (vbrev8)
+  x = ((x & 0x5555555555555555llu) <<  1) | ((x & 0xAAAAAAAAAAAAAAAAllu) >>  1);
+  x = ((x & 0x3333333333333333llu) <<  2) | ((x & 0xCCCCCCCCCCCCCCCCllu) >>  2);
+  x = ((x & 0x0F0F0F0F0F0F0F0Fllu) <<  4) | ((x & 0xF0F0F0F0F0F0F0F0llu) >>  4);
+  // Re-order bytes (vrev8)
+  if (P.VU.vsew > 8)
+    x = ((x & 0x00FF00FF00FF00FFllu) <<  8) | ((x & 0xFF00FF00FF00FF00llu) >>  8);
+  if (P.VU.vsew > 16)
+    x = ((x & 0x0000FFFF0000FFFFllu) << 16) | ((x & 0xFFFF0000FFFF0000llu) >> 16);
+  if (P.VU.vsew > 32)
+    x = ((x & 0x00000000FFFFFFFFllu) << 32) | ((x & 0xFFFFFFFF00000000llu) >> 32);
+
+  vd = x;
+})