[RISCV] Add register overlap checks to the assembler for some Zvk* instructions. (#86745)

From the spec

| Instruction | Register | Cannot Overlap |
| ----------- | -------- | -------------- |
| vaes*.vs    | vs2      | vd             |
| vsm4r.vs    | vs2      | vd             |
| vsha2c[hl]  | vs1, vs2 | vd             |
| vsha2ms     | vs1, vs2 | vd             |
| sm3me       | vs2      | vd             |
| vsm3c       | vs2      | vd             |

llvm/lib/Target/RISCV/RISCVInstrFormats.td

@@ -109,6 +109,8 @@ def Vrgather     : RISCVVConstraint<!or(VS2Constraint.Value,
                                         VMConstraint.Value)>;
 def Vcompress    : RISCVVConstraint<!or(VS2Constraint.Value,
                                         VS1Constraint.Value)>;
+def Sha2Constraint : RISCVVConstraint<!or(VS2Constraint.Value,
+                                          VS1Constraint.Value)>;
 
 // The following opcode names match those given in Table 19.1 in the
 // RISC-V User-level ISA specification ("RISC-V base opcode map").

llvm/lib/Target/RISCV/RISCVInstrInfoZvk.td

@@ -82,7 +82,9 @@ class PALUVs2NoVm<bits<6> funct6, bits<5> vs1, RISCVVFormat opv, string opcodest
 
 multiclass VAES_MV_V_S<bits<6> funct6_vv, bits<6> funct6_vs, bits<5> vs1,
                          RISCVVFormat opv, string opcodestr> {
+  let RVVConstraint = NoConstraint in
   def NAME # _VV : PALUVs2NoVm<funct6_vv, vs1, opv, opcodestr # ".vv">;
+  let RVVConstraint = VS2Constraint in
   def NAME # _VS : PALUVs2NoVm<funct6_vs, vs1, opv, opcodestr # ".vs">;
 }
 } // hasSideEffects = 0, mayLoad = 0, mayStore = 0
@@ -118,28 +120,30 @@ let Predicates = [HasStdExtZvkg], RVVConstraint = NoConstraint in {
   def VGMUL_VV : PALUVs2NoVm<0b101000, 0b10001, OPMVV, "vgmul.vv">;
 } // Predicates = [HasStdExtZvkg]
 
-let Predicates = [HasStdExtZvknhaOrZvknhb], RVVConstraint = NoConstraint in {
+let Predicates = [HasStdExtZvknhaOrZvknhb], RVVConstraint = Sha2Constraint in {
   def VSHA2CH_VV : PALUVVNoVm<0b101110, OPMVV, "vsha2ch.vv">;
   def VSHA2CL_VV : PALUVVNoVm<0b101111, OPMVV, "vsha2cl.vv">;
   def VSHA2MS_VV : PALUVVNoVm<0b101101, OPMVV, "vsha2ms.vv">;
 } // Predicates = [HasStdExtZvknhaOrZvknhb]
 
-let Predicates = [HasStdExtZvkned], RVVConstraint = NoConstraint in {
+let Predicates = [HasStdExtZvkned]in {
   defm VAESDF     : VAES_MV_V_S<0b101000, 0b101001, 0b00001, OPMVV, "vaesdf">;
   defm VAESDM     : VAES_MV_V_S<0b101000, 0b101001, 0b00000, OPMVV, "vaesdm">;
   defm VAESEF     : VAES_MV_V_S<0b101000, 0b101001, 0b00011, OPMVV, "vaesef">;
   defm VAESEM     : VAES_MV_V_S<0b101000, 0b101001, 0b00010, OPMVV, "vaesem">;
   def  VAESKF1_VI : PALUVINoVm<0b100010, "vaeskf1.vi", uimm5>;
   def  VAESKF2_VI : PALUVINoVm<0b101010, "vaeskf2.vi", uimm5>;
+  let RVVConstraint = VS2Constraint in
   def  VAESZ_VS   : PALUVs2NoVm<0b101001, 0b00111, OPMVV, "vaesz.vs">;
 } // Predicates = [HasStdExtZvkned]
 
-let Predicates = [HasStdExtZvksed], RVVConstraint = NoConstraint in {
+let Predicates = [HasStdExtZvksed] in {
+  let RVVConstraint = NoConstraint in
   def  VSM4K_VI : PALUVINoVm<0b100001, "vsm4k.vi", uimm5>;
   defm VSM4R    : VAES_MV_V_S<0b101000, 0b101001, 0b10000, OPMVV, "vsm4r">;
 } // Predicates = [HasStdExtZvksed]
 
-let Predicates = [HasStdExtZvksh], RVVConstraint = NoConstraint in {
+let Predicates = [HasStdExtZvksh], RVVConstraint = VS2Constraint in {
   def VSM3C_VI  : PALUVINoVm<0b101011, "vsm3c.vi", uimm5>;
   def VSM3ME_VV : PALUVVNoVm<0b100000, OPMVV, "vsm3me.vv">;
 } // Predicates = [HasStdExtZvksh]

llvm/test/MC/RISCV/rvv/zvkned-invalid.s

@@ -0,0 +1,23 @@
+# RUN: not llvm-mc -triple=riscv64 --mattr=+zve64x --mattr=+zvkned %s 2>&1 \
+# RUN:        | FileCheck %s --check-prefix=CHECK-ERROR
+
+vaesdf.vs v10, v10
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vaesdf.vs v10, v10
+
+vaesef.vs v11, v11
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vaesef.vs v11, v11
+
+vaesdm.vs v12, v12
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vaesdm.vs v12, v12
+
+vaesem.vs v13, v13
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vaesem.vs v13, v13
+
+vaesz.vs v14, v14
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vaesz.vs v14, v14
+

llvm/test/MC/RISCV/rvv/zvknh-invalid.s

@@ -0,0 +1,26 @@
+# RUN: not llvm-mc -triple=riscv64 --mattr=+zve64x --mattr=+zvknha %s 2>&1 \
+# RUN:        | FileCheck %s --check-prefix=CHECK-ERROR
+
+vsha2ms.vv v10, v10, v11
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vsha2ms.vv v10, v10, v11
+
+vsha2ms.vv v11, v10, v11
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vsha2ms.vv v11, v10, v11
+
+vsha2ch.vv v12, v12, v11
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vsha2ch.vv v12, v12, v11
+
+vsha2ch.vv v11, v12, v11
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vsha2ch.vv v11, v12, v11
+
+vsha2cl.vv v13, v13, v15
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vsha2cl.vv v13, v13, v15
+
+vsha2cl.vv v15, v13, v15
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vsha2cl.vv v15, v13, v15

llvm/test/MC/RISCV/rvv/zvksed-invalid.s

@@ -0,0 +1,6 @@
+# RUN: not llvm-mc -triple=riscv64 --mattr=+zve64x --mattr=+zvksed %s 2>&1 \
+# RUN:        | FileCheck %s --check-prefix=CHECK-ERROR
+
+vsm4r.vs v10, v10
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vsm4r.vs v10, v10

llvm/test/MC/RISCV/rvv/zvksh-invalid.s

@@ -0,0 +1,10 @@
+# RUN: not llvm-mc -triple=riscv64 --mattr=+zve64x --mattr=+zvksh %s 2>&1 \
+# RUN:        | FileCheck %s --check-prefix=CHECK-ERROR
+
+vsm3me.vv v10, v10, v8
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vsm3me.vv v10, v10, v8
+
+vsm3c.vi v9, v9, 7
+# CHECK-ERROR: The destination vector register group cannot overlap the source vector register group.
+# CHECK-ERROR-LABEL: vsm3c.vi v9, v9, 7

llvm/test/MC/RISCV/rvv/zvksh.s

@@ -19,3 +19,10 @@ vsm3me.vv v10, v9, v8
 # CHECK-ENCODING: [0x77,0x25,0x94,0x82]
 # CHECK-ERROR: instruction requires the following: 'Zvksh' (SM3 Hash Function Instructions){{$}}
 # CHECK-UNKNOWN: 77 25 94 82   <unknown>
+
+# vs1 is allowed to overlap, but not vs2.
+vsm3me.vv v10, v9, v10
+# CHECK-INST: vsm3me.vv v10, v9, v10
+# CHECK-ENCODING: [0x77,0x25,0x95,0x82]
+# CHECK-ERROR: instruction requires the following: 'Zvksh' (SM3 Hash Function Instructions){{$}}
+# CHECK-UNKNOWN: 77 25 95 82   <unknown>