8 files changed, 44 insertions, 0 deletions
diff --git a/riscv/decode.h b/riscv/decode.h
index 4361466..e912789 100644
--- a/riscv/decode.h
+++ b/riscv/decode.h
@@ -1756,6 +1756,38 @@ for (reg_t i = 0; i < P.VU.vlmax && P.VU.vl != 0; ++i) { \
   } \
   P.VU.vstart = 0;
 
+// vector: sign/unsiged extension
+#define VI_VV_EXT(div, type) \
+  reg_t from = P.VU.vsew / div; \
+  require(from >= e8 && from <= e64); \
+  const reg_t mew = insn.v_mew(); \
+  const reg_t width = insn.v_width(); \
+  VI_EEW(mew, width); \
+  VI_GENERAL_LOOP_BASE \
+    switch (((P.VU.vsew >> 3) << 4)| from) { \
+      case 0x21: \
+        P.VU.elt<type##16_t>(rd_num, i, true) = P.VU.elt<type##8_t>(rs2_num, i); \
+        break; \
+      case 0x41: \
+        P.VU.elt<type##32_t>(rd_num, i, true) = P.VU.elt<type##8_t>(rs2_num, i); \
+        break; \
+      case 0x81: \
+        P.VU.elt<type##64_t>(rd_num, i, true) = P.VU.elt<type##8_t>(rs2_num, i); \
+        break; \
+      case 0x42: \
+        P.VU.elt<type##32_t>(rd_num, i, true) = P.VU.elt<type##16_t>(rs2_num, i); \
+        break; \
+      case 0x82: \
+        P.VU.elt<type##64_t>(rd_num, i, true) = P.VU.elt<type##16_t>(rs2_num, i); \
+        break; \
+      case 0x84: \
+        P.VU.elt<type##64_t>(rd_num, i, true) = P.VU.elt<type##32_t>(rs2_num, i); \
+        break; \
+      default: \
+        break; \
+    } \
+  VI_LOOP_END
+
 //
 // vector: vfp helper
 //
diff --git a/riscv/insns/vsext_vf2.h b/riscv/insns/vsext_vf2.h
new file mode 100644
index 0000000..16ccfac
--- /dev/null
+++ b/riscv/insns/vsext_vf2.h
@@ -0,0 +1 @@
+VI_VV_EXT(2, int);
diff --git a/riscv/insns/vsext_vf4.h b/riscv/insns/vsext_vf4.h
new file mode 100644
index 0000000..d4476a3
--- /dev/null
+++ b/riscv/insns/vsext_vf4.h
@@ -0,0 +1 @@
+VI_VV_EXT(4, int);
diff --git a/riscv/insns/vsext_vf8.h b/riscv/insns/vsext_vf8.h
new file mode 100644
index 0000000..09fdc2c
--- /dev/null
+++ b/riscv/insns/vsext_vf8.h
@@ -0,0 +1 @@
+VI_VV_EXT(8, int);
diff --git a/riscv/insns/vzext_vf2.h b/riscv/insns/vzext_vf2.h
new file mode 100644
index 0000000..100f2e3
--- /dev/null
+++ b/riscv/insns/vzext_vf2.h
@@ -0,0 +1 @@
+VI_VV_EXT(2, uint);
diff --git a/riscv/insns/vzext_vf4.h b/riscv/insns/vzext_vf4.h
new file mode 100644
index 0000000..6ff920e
--- /dev/null
+++ b/riscv/insns/vzext_vf4.h
@@ -0,0 +1 @@
+VI_VV_EXT(4, uint);
diff --git a/riscv/insns/vzext_vf8.h b/riscv/insns/vzext_vf8.h
new file mode 100644
index 0000000..b1762fb
--- /dev/null
+++ b/riscv/insns/vzext_vf8.h
@@ -0,0 +1 @@
+VI_VV_EXT(8, uint);
diff --git a/riscv/riscv.mk.in b/riscv/riscv.mk.in
index 768439f..b11bc8c 100644
--- a/riscv/riscv.mk.in
+++ b/riscv/riscv.mk.in
@@ -479,6 +479,9 @@ riscv_insn_ext_v_alu_int = \
 	vsaddu_vx \
 	vsbc_vvm \
 	vsbc_vxm \
+	vsext_vf2 \
+	vsext_vf4 \
+	vsext_vf8 \
 	vslide1down_vx \
 	vslide1up_vx \
 	vslidedown_vi \
@@ -542,6 +545,9 @@ riscv_insn_ext_v_alu_int = \
 	vxor_vi \
 	vxor_vv \
 	vxor_vx \
+	vzext_vf2 \
+	vzext_vf4 \
+	vzext_vf8 \
 
 riscv_insn_ext_v_alu_fp = \
 	vfadd_vf \