================
@@ -0,0 +1,59 @@
+# RUN: llvm-mc %s -triple=riscv32 -mattr=+experimental-xrivosvizip 
-riscv-no-aliases -show-encoding \
+# RUN:     | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
+# RUN: llvm-mc -filetype=obj -triple=riscv32 -mattr=+experimental-xrivosvizip 
< %s \
+# RUN:     | llvm-objdump --mattr=+experimental-xrivosvizip -M no-aliases -d 
-r - \
+# RUN:     | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
+# RUN: llvm-mc %s -triple=riscv64 -mattr=+experimental-xrivosvizip 
-riscv-no-aliases -show-encoding \
+# RUN:     | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
+# RUN: llvm-mc -filetype=obj -triple=riscv64 -mattr=+experimental-xrivosvizip 
< %s \
+# RUN:     | llvm-objdump --mattr=+experimental-xrivosvizip -M no-aliases -d 
-r - \
+# RUN:     | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
+
+# CHECK-ASM-AND-OBJ: rv.vzipeven.vv    v1, v2, v3
+# CHECK-ASM: encoding: [0xdb,0x80,0x21,0x32]
+rv.vzipeven.vv v1, v2, v3
+# CHECK-ASM-AND-OBJ: rv.vzipeven.vv    v1, v2, v3, v0.t
+# CHECK-ASM: encoding: [0xdb,0x80,0x21,0x30]
+rv.vzipeven.vv v1, v2, v3, v0.t
+# CHECK-ASM-AND-OBJ: rv.vzipodd.vv  v1, v2, v3
+# CHECK-ASM: encoding: [0xdb,0x80,0x21,0x72]
+rv.vzipodd.vv v1, v2, v3
+# CHECK-ASM-AND-OBJ: rv.vzipodd.vv  v1, v2, v3, v0.t
+# CHECK-ASM: encoding: [0xdb,0x80,0x21,0x70]
+rv.vzipodd.vv v1, v2, v3, v0.t
+
+# CHECK-ASM-AND-OBJ:  rv.vzip2a.vv   v1, v2, v3
+# CHECK-ASM: encoding: [0xdb,0x80,0x21,0x12]
+rv.vzip2a.vv v1, v2, v3
+# CHECK-ASM-AND-OBJ:  rv.vzip2a.vv   v1, v2, v3, v0.t
+# CHECK-ASM: encoding: [0xdb,0x80,0x21,0x10]
+rv.vzip2a.vv v1, v2, v3, v0.t
+# CHECK-ASM-AND-OBJ: rv.vzip2b.vv   v1, v2, v3
+# CHECK-ASM: encoding: [0xdb,0x80,0x21,0x52]
+rv.vzip2b.vv v1, v2, v3
+# CHECK-ASM-AND-OBJ: rv.vzip2b.vv   v1, v2, v3, v0.t
+# CHECK-ASM: encoding: [0xdb,0x80,0x21,0x50]
+rv.vzip2b.vv v1, v2, v3, v0.t
+
+# CHECK-ASM-AND-OBJ: rv.vunzip2a.vv v1, v2, v3
+# CHECK-ASM: encoding: [0xdb,0x80,0x21,0x22]
+rv.vunzip2a.vv v1, v2, v3
+# CHECK-ASM-AND-OBJ: rv.vunzip2a.vv v1, v2, v3, v0.t
+# CHECK-ASM: encoding: [0xdb,0x80,0x21,0x20]
+rv.vunzip2a.vv v1, v2, v3, v0.t
+# CHECK-ASM-AND-OBJ: rv.vunzip2b.vv v1, v2, v3
+# CHECK-ASM: encoding: [0xdb,0x80,0x21,0x62]
+rv.vunzip2b.vv v1, v2, v3
+# CHECK-ASM-AND-OBJ: rv.vunzip2b.vv v1, v2, v3, v0.t
+# CHECK-ASM: encoding: [0xdb,0x80,0x21,0x60]
+rv.vunzip2b.vv v1, v2, v3, v0.t
+
+# Overlap between source registers *is* allowed
+
+# CHECK-ASM-AND-OBJ: rv.vzipeven.vv    v1, v2, v2
+# CHECK-ASM: encoding: [0xdb,0x00,0x21,0x32]
+rv.vzipeven.vv v1, v2, v2
+
+# CHECK-ASM-AND-OBJ: rv.vzipeven.vv    v1, v2, v0, v0.t
+# CHECK-ASM: encoding: [0xdb,0x00,0x20,0x30]
+rv.vzipeven.vv v1, v2, v0, v0.t
----------------
topperc wrote:

This is technically ill-formed by the rule that you can't read the same source 
with 2 different EEWs, but I don't think we enforce that anywhere today.

https://github.com/llvm/llvm-project/pull/127694
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