diff --git a/llvm/lib/Target/RISCV/RISCVSystemOperands.td b/llvm/lib/Target/RISCV/RISCVSystemOperands.td
--- a/llvm/lib/Target/RISCV/RISCVSystemOperands.td
+++ b/llvm/lib/Target/RISCV/RISCVSystemOperands.td
@@ -135,6 +135,15 @@
 
 def : SysReg<"senvcfg", 0x10A>;
 
+//===----------------------------------------------------------------------===//
+// Supervisor-Level High-Half CSRs for Interrupts 32-63 (RV32 only)
+//===----------------------------------------------------------------------===//
+
+let isRV32Only = 1 in {
+def : SysReg<"sieh", 0x114>;
+def : SysReg<"siph", 0x154>;
+} // isRV32Only = 1
+
 //===----------------------------------------------------------------------===//
 // Supervisor Trap Handling
 //===----------------------------------------------------------------------===//
@@ -145,6 +154,20 @@
 def : SysReg<"stval", 0x143>;
 def : SysReg<"sip", 0x144>;
 
+//===----------------------------------------------------------------------===//
+// Supervisor-level CSRs
+//===----------------------------------------------------------------------===//
+
+def : SysReg<"siselect", 0x150>;
+def : SysReg<"sireg", 0x151>;
+
+//===----------------------------------------------------------------------===//
+// Supervisor-Level Interrupts
+//===----------------------------------------------------------------------===//
+
+def : SysReg<"stopei", 0x15C>;
+def : SysReg<"stopi", 0xDB0>;
+
 //===----------------------------------------------------------------------===//
 // Supervisor Protection and Translation
 //===----------------------------------------------------------------------===//
@@ -174,6 +197,29 @@
 def : SysReg<"hcounteren", 0x606>;
 def : SysReg<"hgeie", 0x607>;
 
+//===----------------------------------------------------------------------===//
+// Virtual Interrupts and Interrupt Priorities for VS Level
+//===----------------------------------------------------------------------===//
+
+def : SysReg<"hvien", 0x608>;
+def : SysReg<"hvictl", 0x609>;
+def : SysReg<"hviprio1", 0x646>;
+def : SysReg<"hviprio2", 0x647>;
+
+//===----------------------------------------------------------------------===//
+// Hypervisor and VS-Level High-Half CSRs (RV32 only)
+//===----------------------------------------------------------------------===//
+
+let isRV32Only = 1 in {
+def : SysReg<"hidelegh", 0x613>;
+def : SysReg<"hvienh", 0x618>;
+def : SysReg<"hviph", 0x655>;
+def : SysReg<"hviprio1h", 0x656>;
+def : SysReg<"hviprio2h", 0x657>;
+def : SysReg<"vsieh", 0x214>;
+def : SysReg<"vsiph", 0x254>;
+} // isRV32Only = 1 
+
 //===----------------------------------------------------------------------===//
 // Hypervisor Trap Handling
 //===----------------------------------------------------------------------===//
@@ -229,6 +275,20 @@
 def : SysReg<"vstimecmph", 0x25D>;
 def : SysReg<"vsatp", 0x280>;
 
+//===----------------------------------------------------------------------===//
+// VS-Level Window to Indirectly Accessed Registers
+//===----------------------------------------------------------------------===//
+
+def : SysReg<"vsiselect", 0x250>;
+def : SysReg<"vsireg", 0x251>;
+
+//===----------------------------------------------------------------------===//
+// VS-Level Interrupts
+//===----------------------------------------------------------------------===//
+
+def : SysReg<"vstopei", 0x25C>;
+def : SysReg<"vstopi", 0xEB0>;
+
 //===----------------------------------------------------------------------===//
 // Machine Information Registers
 //===----------------------------------------------------------------------===//
@@ -252,6 +312,25 @@
 let isRV32Only = 1 in
 def : SysReg<"mstatush", 0x310>;
 
+//===----------------------------------------------------------------------===//
+// Virtual Interrupts for Supervisor Level
+//===----------------------------------------------------------------------===//
+
+def : SysReg<"mvien", 0x308>;
+def : SysReg<"mvip", 0x309>;
+
+//===----------------------------------------------------------------------===//
+// Machine-Level High-Half CSRs for Interrupts 32-63 (RV32 only)
+//===----------------------------------------------------------------------===//
+
+let isRV32Only = 1 in {
+def : SysReg<"midelegh", 0x313>;
+def : SysReg<"mieh", 0x314>;
+def : SysReg<"mvienh", 0x318>;
+def : SysReg<"mviph", 0x319>;
+def : SysReg<"miph", 0x354>;
+} // isRV32Only = 1
+
 //===----------------------------------------------------------------------===//
 // Machine Trap Handling
 //===----------------------------------------------------------------------===//
@@ -264,6 +343,20 @@
 def : SysReg<"mtinst", 0x34A>;
 def : SysReg<"mtval2", 0x34B>;
 
+//===----------------------------------------------------------------------===//
+// Machine-Level Window to Indirectly Accessed Registers
+//===----------------------------------------------------------------------===//
+
+def : SysReg<"miselect", 0x350>;
+def : SysReg<"mireg", 0x351>;
+
+//===----------------------------------------------------------------------===//
+// Machine-Level Interrupts
+//===----------------------------------------------------------------------===//
+
+def : SysReg<"mtopei", 0x35C>;
+def : SysReg<"mtopi", 0xFB0>;
+
 //===----------------------------------------------------------------------===//
 // Machine Configuration
 //===----------------------------------------------------------------------===//
diff --git a/llvm/test/MC/RISCV/hypervisor-csr-names.s b/llvm/test/MC/RISCV/hypervisor-csr-names.s
--- a/llvm/test/MC/RISCV/hypervisor-csr-names.s
+++ b/llvm/test/MC/RISCV/hypervisor-csr-names.s
@@ -98,6 +98,66 @@
 # uimm12
 csrrs t2, 0x607, zero
 
+#########################################
+# Virtual Interrupts and Interrupt Priorities for VS Level
+#########################################
+
+# hvien
+# name
+# CHECK-INST: csrrs t1, hvien, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x80,0x60]
+# CHECK-INST-ALIAS: csrr t1, hvien
+# uimm12
+# CHECK-INST: csrrs t2, hvien, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x80,0x60]
+# CHECK-INST-ALIAS: csrr t2, hvien
+# name
+csrrs t1, hvien, zero
+# uimm12
+csrrs t2, 0x608, zero
+
+# hvictl
+# name
+# CHECK-INST: csrrs t1, hvictl, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x90,0x60]
+# CHECK-INST-ALIAS: csrr t1, hvictl
+# uimm12
+# CHECK-INST: csrrs t2, hvictl, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x90,0x60]
+# CHECK-INST-ALIAS: csrr t2, hvictl
+# name
+csrrs t1, hvictl, zero
+# uimm12
+csrrs t2, 0x609, zero
+
+# hviprio1
+# name
+# CHECK-INST: csrrs t1, hviprio1, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x60,0x64]
+# CHECK-INST-ALIAS: csrr t1, hviprio1
+# uimm12
+# CHECK-INST: csrrs t2, hviprio1, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x60,0x64]
+# CHECK-INST-ALIAS: csrr t2, hviprio1
+# name
+csrrs t1, hviprio1, zero
+# uimm12
+csrrs t2, 0x646, zero
+
+# hviprio2
+# name
+# CHECK-INST: csrrs t1, hviprio2, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x70,0x64]
+# CHECK-INST-ALIAS: csrr t1, hviprio2
+# uimm12
+# CHECK-INST: csrrs t2, hviprio2, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x70,0x64]
+# CHECK-INST-ALIAS: csrr t2, hviprio2
+# name
+csrrs t1, hviprio2, zero
+# uimm12
+csrrs t2, 0x647, zero
+
 ##################################
 # Hypervisor Trap Handling
 ##################################
@@ -388,6 +448,70 @@
 # uimm12
 csrrs t2, 0x280, zero
 
+###################################################
+# VS-Level Window to Indirectly Accessed Registers
+###################################################
+
+# vsiselect
+# name
+# CHECK-INST: csrrs t1, vsiselect, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x00,0x25]
+# CHECK-INST-ALIAS: csrr t1, vsiselect
+# uimm12
+# CHECK-INST: csrrs t2, vsiselect, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x00,0x25]
+# CHECK-INST-ALIAS: csrr t2, vsiselect
+# name
+csrrs t1, vsiselect, zero
+# uimm12
+csrrs t2, 0x250, zero
+
+# vsireg
+# name
+# CHECK-INST: csrrs t1, vsireg, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x10,0x25]
+# CHECK-INST-ALIAS: csrr t1, vsireg
+# uimm12
+# CHECK-INST: csrrs t2, vsireg, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x10,0x25]
+# CHECK-INST-ALIAS: csrr t2, vsireg
+# name
+csrrs t1, vsireg, zero
+# uimm12
+csrrs t2, 0x251, zero
+
+#######################
+# VS-Level Interrupts
+#######################
+
+# vstopei
+# name
+# CHECK-INST: csrrs t1, vstopei, zero
+# CHECK-ENC: encoding: [0x73,0x23,0xc0,0x25]
+# CHECK-INST-ALIAS: csrr t1, vstopei
+# uimm12
+# CHECK-INST: csrrs t2, vstopei, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0xc0,0x25]
+# CHECK-INST-ALIAS: csrr t2, vstopei
+# name
+csrrs t1, vstopei, zero
+# uimm12
+csrrs t2, 0x25C, zero
+
+# vstopi
+# name
+# CHECK-INST: csrrs t1, vstopi, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x00,0xeb]
+# CHECK-INST-ALIAS: csrr t1, vstopi
+# uimm12
+# CHECK-INST: csrrs t2, vstopi, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x00,0xeb]
+# CHECK-INST-ALIAS: csrr t2, vstopi
+# name
+csrrs t1, vstopi, zero
+# uimm12
+csrrs t2, 0xEB0, zero
+
 #########################################
 # State Enable Extension (Smstateen)
 #########################################
diff --git a/llvm/test/MC/RISCV/machine-csr-names.s b/llvm/test/MC/RISCV/machine-csr-names.s
--- a/llvm/test/MC/RISCV/machine-csr-names.s
+++ b/llvm/test/MC/RISCV/machine-csr-names.s
@@ -285,6 +285,102 @@
 # uimm12
 csrrs t2, 0x34B, zero
 
+########################################################
+# Machine-Level Window to Indirectly Accessed Registers
+########################################################
+
+# miselect
+# name
+# CHECK-INST: csrrs t1, miselect, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x00,0x35]
+# CHECK-INST-ALIAS: csrr t1, miselect
+# uimm12
+# CHECK-INST: csrrs t2, miselect, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x00,0x35]
+# CHECK-INST-ALIAS: csrr t2, miselect
+# name
+csrrs t1, miselect, zero
+# uimm12
+csrrs t2, 0x350, zero
+
+# mireg
+# name
+# CHECK-INST: csrrs t1, mireg, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x10,0x35]
+# CHECK-INST-ALIAS: csrr t1, mireg
+# uimm12
+# CHECK-INST: csrrs t2, mireg, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x10,0x35]
+# CHECK-INST-ALIAS: csrr t2, mireg
+# name
+csrrs t1, mireg, zero
+# uimm12
+csrrs t2, 0x351, zero
+
+############################
+# Machine-Level Interrupts
+############################
+
+# mtopei
+# name
+# CHECK-INST: csrrs t1, mtopei, zero
+# CHECK-ENC: encoding: [0x73,0x23,0xc0,0x35]
+# CHECK-INST-ALIAS: csrr t1, mtopei
+# uimm12
+# CHECK-INST: csrrs t2, mtopei, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0xc0,0x35]
+# CHECK-INST-ALIAS: csrr t2, mtopei
+# name
+csrrs t1, mtopei, zero
+# uimm12
+csrrs t2, 0x35C, zero
+
+# mtopi
+# name
+# CHECK-INST: csrrs t1, mtopi, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x00,0xfb]
+# CHECK-INST-ALIAS: csrr t1, mtopi
+# uimm12
+# CHECK-INST: csrrs t2, mtopi, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x00,0xfb]
+# CHECK-INST-ALIAS: csrr t2, mtopi
+# name
+csrrs t1, mtopi, zero
+# uimm12
+csrrs t2, 0xFB0, zero
+
+##########################################
+# Virtual Interrupts for Supervisor Level
+##########################################
+
+# mvien
+# name
+# CHECK-INST: csrrs t1, mvien, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x80,0x30]
+# CHECK-INST-ALIAS: csrr t1, mvien
+# uimm12
+# CHECK-INST: csrrs t2, mvien, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x80,0x30]
+# CHECK-INST-ALIAS: csrr t2, mvien
+# name
+csrrs t1, mvien, zero
+# uimm12
+csrrs t2, 0x308, zero
+
+# mvip
+# name
+# CHECK-INST: csrrs t1, mvip, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x90,0x30]
+# CHECK-INST-ALIAS: csrr t1, mvip
+# uimm12
+# CHECK-INST: csrrs t2, mvip, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x90,0x30]
+# CHECK-INST-ALIAS: csrr t2, mvip
+# name
+csrrs t1, mvip, zero
+# uimm12
+csrrs t2, 0x309, zero
+
 #########################
 # Machine Configuration
 #########################
diff --git a/llvm/test/MC/RISCV/rv32-hypervisor-csr-names.s b/llvm/test/MC/RISCV/rv32-hypervisor-csr-names.s
--- a/llvm/test/MC/RISCV/rv32-hypervisor-csr-names.s
+++ b/llvm/test/MC/RISCV/rv32-hypervisor-csr-names.s
@@ -4,6 +4,108 @@
 # RUN:     | llvm-objdump -d - \
 # RUN:     | FileCheck -check-prefix=CHECK-INST-ALIAS %s
 
+#########################################
+# Hypervisor and VS-Level High-Half CSRs
+#########################################
+
+# hidelegh
+# name
+# CHECK-INST: csrrs t1, hidelegh, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x30,0x61]
+# CHECK-INST-ALIAS: csrr t1, hidelegh
+# uimm12
+# CHECK-INST: csrrs t2, hidelegh, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x30,0x61]
+# CHECK-INST-ALIAS: csrr t2, hidelegh
+# name
+csrrs t1, hidelegh, zero
+# uimm12
+csrrs t2, 0x613, zero
+
+# hvienh
+# name
+# CHECK-INST: csrrs t1, hvienh, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x80,0x61]
+# CHECK-INST-ALIAS: csrr t1, hvienh
+# uimm12
+# CHECK-INST: csrrs t2, hvienh, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x80,0x61]
+# CHECK-INST-ALIAS: csrr t2, hvienh
+# name
+csrrs t1, hvienh, zero
+# uimm12
+csrrs t2, 0x618, zero
+
+# hviph
+# name
+# CHECK-INST: csrrs t1, hviph, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x50,0x65]
+# CHECK-INST-ALIAS: csrr t1, hviph
+# uimm12
+# CHECK-INST: csrrs t2, hviph, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x50,0x65]
+# CHECK-INST-ALIAS: csrr t2, hviph
+# name
+csrrs t1, hviph, zero
+# uimm12
+csrrs t2, 0x655, zero
+
+# hviprio1h
+# name
+# CHECK-INST: csrrs t1, hviprio1h, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x60,0x65]
+# CHECK-INST-ALIAS: csrr t1, hviprio1h
+# uimm12
+# CHECK-INST: csrrs t2, hviprio1h, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x60,0x65]
+# CHECK-INST-ALIAS: csrr t2, hviprio1h
+# name
+csrrs t1, hviprio1h, zero
+# uimm12
+csrrs t2, 0x656, zero
+
+# hviprio2h
+# name
+# CHECK-INST: csrrs t1, hviprio2h, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x70,0x65]
+# CHECK-INST-ALIAS: csrr t1, hviprio2h
+# uimm12
+# CHECK-INST: csrrs t2, hviprio2h, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x70,0x65]
+# CHECK-INST-ALIAS: csrr t2, hviprio2h
+# name
+csrrs t1, hviprio2h, zero
+# uimm12
+csrrs t2, 0x657, zero
+
+# vsieh
+# name
+# CHECK-INST: csrrs t1, vsieh, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x40,0x21]
+# CHECK-INST-ALIAS: csrr t1, vsieh
+# uimm12
+# CHECK-INST: csrrs t2, vsieh, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x40,0x21]
+# CHECK-INST-ALIAS: csrr t2, vsieh
+# name
+csrrs t1, vsieh, zero
+# uimm12
+csrrs t2, 0x214, zero
+
+# vsiph
+# name
+# CHECK-INST: csrrs t1, vsiph, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x40,0x25]
+# CHECK-INST-ALIAS: csrr t1, vsiph
+# uimm12
+# CHECK-INST: csrrs t2, vsiph, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x40,0x25]
+# CHECK-INST-ALIAS: csrr t2, vsiph
+# name
+csrrs t1, vsiph, zero
+# uimm12
+csrrs t2, 0x254, zero
+
 ##################################
 # Hypervisor Configuration
 ##################################
diff --git a/llvm/test/MC/RISCV/rv32-machine-csr-names.s b/llvm/test/MC/RISCV/rv32-machine-csr-names.s
--- a/llvm/test/MC/RISCV/rv32-machine-csr-names.s
+++ b/llvm/test/MC/RISCV/rv32-machine-csr-names.s
@@ -22,6 +22,80 @@
 # uimm12
 csrrs t2, 0x310, zero
 
+####################################################
+# Machine-Level High-Half CSRs for Interrupts 32-63
+####################################################
+
+# midelegh
+# name
+# CHECK-INST: csrrs t1, midelegh, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x30,0x31]
+# CHECK-INST-ALIAS: csrr t1, midelegh
+# uimm12
+# CHECK-INST: csrrs t2, midelegh, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x30,0x31]
+# CHECK-INST-ALIAS: csrr t2, midelegh
+# name
+csrrs t1, midelegh, zero
+# uimm12
+csrrs t2, 0x313, zero
+
+# mieh
+# name
+# CHECK-INST: csrrs t1, mieh, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x40,0x31]
+# CHECK-INST-ALIAS: csrr t1, mieh
+# uimm12
+# CHECK-INST: csrrs t2, mieh, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x40,0x31]
+# CHECK-INST-ALIAS: csrr t2, mieh
+# name
+csrrs t1, mieh, zero
+# uimm12
+csrrs t2, 0x314, zero
+
+# mvienh
+# name
+# CHECK-INST: csrrs t1, mvienh, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x80,0x31]
+# CHECK-INST-ALIAS: csrr t1, mvienh
+# uimm12
+# CHECK-INST: csrrs t2, mvienh, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x80,0x31]
+# CHECK-INST-ALIAS: csrr t2, mvienh
+# name
+csrrs t1, mvienh, zero
+# uimm12
+csrrs t2, 0x318, zero
+
+# mviph
+# name
+# CHECK-INST: csrrs t1, mviph, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x90,0x31]
+# CHECK-INST-ALIAS: csrr t1, mviph
+# uimm12
+# CHECK-INST: csrrs t2, mviph, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x90,0x31]
+# CHECK-INST-ALIAS: csrr t2, mviph
+# name
+csrrs t1, mviph, zero
+# uimm12
+csrrs t2, 0x319, zero
+
+# miph
+# name
+# CHECK-INST: csrrs t1, miph, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x40,0x35]
+# CHECK-INST-ALIAS: csrr t1, miph
+# uimm12
+# CHECK-INST: csrrs t2, miph, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x40,0x35]
+# CHECK-INST-ALIAS: csrr t2, miph
+# name
+csrrs t1, miph, zero
+# uimm12
+csrrs t2, 0x354, zero
+
 #########################
 # Machine Configuration
 #########################
diff --git a/llvm/test/MC/RISCV/rv32-supervisor-csr-names.s b/llvm/test/MC/RISCV/rv32-supervisor-csr-names.s
--- a/llvm/test/MC/RISCV/rv32-supervisor-csr-names.s
+++ b/llvm/test/MC/RISCV/rv32-supervisor-csr-names.s
@@ -21,3 +21,35 @@
 csrrs t1, stimecmph, zero
 # uimm12
 csrrs t2, 0x15D, zero
+
+#######################################################
+# Supervisor-Level High-Half CSRs for Interrupts 32-63
+#######################################################
+
+# sieh
+# name
+# CHECK-INST: csrrs t1, sieh, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x40,0x11]
+# CHECK-INST-ALIAS: csrr t1, sieh
+# uimm12
+# CHECK-INST: csrrs t2, sieh, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x40,0x11]
+# CHECK-INST-ALIAS: csrr t2, sieh
+# name
+csrrs t1, sieh, zero
+# uimm12
+csrrs t2, 0x114, zero
+
+# siph
+# name
+# CHECK-INST: csrrs t1, siph, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x40,0x15]
+# CHECK-INST-ALIAS: csrr t1, siph
+# uimm12
+# CHECK-INST: csrrs t2, siph, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x40,0x15]
+# CHECK-INST-ALIAS: csrr t2, siph
+# name
+csrrs t1, siph, zero
+# uimm12
+csrrs t2, 0x154, zero
diff --git a/llvm/test/MC/RISCV/rvi-aliases-valid.s b/llvm/test/MC/RISCV/rvi-aliases-valid.s
--- a/llvm/test/MC/RISCV/rvi-aliases-valid.s
+++ b/llvm/test/MC/RISCV/rvi-aliases-valid.s
@@ -207,8 +207,8 @@
 # CHECK-S-OBJ: rdtime s9
 rdtime x25
 
-# CHECK-S-OBJ-NOALIAS: csrrs  s0, 336, zero
-# CHECK-S-OBJ: csrr s0, 336
+# CHECK-S-OBJ-NOALIAS: csrrs  s0, siselect, zero
+# CHECK-S-OBJ: csrr s0, siselect
 csrr x8, 0x150
 # CHECK-S-OBJ-NOALIAS: csrrw zero, sscratch, s1
 # CHECK-S-OBJ: csrw sscratch, s1
@@ -220,8 +220,8 @@
 # CHECK-S-OBJ: csrc 4095, s7
 csrc 0xfff, x23
 
-# CHECK-S-OBJ-NOALIAS: csrrwi zero, 336, 15
-# CHECK-S-OBJ: csrwi 336, 15
+# CHECK-S-OBJ-NOALIAS: csrrwi zero, siselect, 15
+# CHECK-S-OBJ: csrwi siselect, 15
 csrwi 0x150, 0xf
 # CHECK-S-OBJ-NOALIAS: csrrsi zero, 4095, 16
 # CHECK-S-OBJ: csrsi 4095, 16
@@ -230,18 +230,18 @@
 # CHECK-S-OBJ: csrci sscratch, 17
 csrci 0x140, 0x11
 
-# CHECK-S-OBJ-NOALIAS: csrrwi zero, 336, 7
-# CHECK-S-OBJ: csrwi 336, 7
+# CHECK-S-OBJ-NOALIAS: csrrwi zero, siselect, 7
+# CHECK-S-OBJ: csrwi siselect, 7
 csrw 0x150, 7
-# CHECK-S-OBJ-NOALIAS: csrrsi zero, 336, 7
-# CHECK-S-OBJ: csrsi 336, 7
+# CHECK-S-OBJ-NOALIAS: csrrsi zero, siselect, 7
+# CHECK-S-OBJ: csrsi siselect, 7
 csrs 0x150, 7
-# CHECK-S-OBJ-NOALIAS: csrrci zero, 336, 7
-# CHECK-S-OBJ: csrci 336, 7
+# CHECK-S-OBJ-NOALIAS: csrrci zero, siselect, 7
+# CHECK-S-OBJ: csrci siselect, 7
 csrc 0x150, 7
 
-# CHECK-S-OBJ-NOALIAS: csrrwi t0, 336, 15
-# CHECK-S-OBJ: csrrwi t0, 336, 15
+# CHECK-S-OBJ-NOALIAS: csrrwi t0, siselect, 15
+# CHECK-S-OBJ: csrrwi t0, siselect, 15
 csrrw t0, 0x150, 0xf
 # CHECK-S-OBJ-NOALIAS: csrrsi t0, 4095, 16
 # CHECK-S-OBJ: csrrsi t0, 4095, 16
diff --git a/llvm/test/MC/RISCV/supervisor-csr-names.s b/llvm/test/MC/RISCV/supervisor-csr-names.s
--- a/llvm/test/MC/RISCV/supervisor-csr-names.s
+++ b/llvm/test/MC/RISCV/supervisor-csr-names.s
@@ -205,6 +205,65 @@
 # uimm12
 csrrs t2, 0x144, zero
 
+########################
+# Supervisor-level CSRs
+########################
+
+# siselect
+# name
+# CHECK-INST: csrrs t1, siselect, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x00,0x15]
+# CHECK-INST-ALIAS: csrr t1, siselect
+# uimm12
+# CHECK-INST: csrrs t2, siselect, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x00,0x15]
+# CHECK-INST-ALIAS: csrr t2, siselect
+csrrs t1, siselect, zero
+# uimm12
+csrrs t2, 0x150, zero
+
+# sireg
+# name
+# CHECK-INST: csrrs t1, sireg, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x10,0x15]
+# CHECK-INST-ALIAS: csrr t1, sireg
+# uimm12
+# CHECK-INST: csrrs t2, sireg, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x10,0x15]
+# CHECK-INST-ALIAS: csrr t2, sireg
+csrrs t1, sireg, zero
+# uimm12
+csrrs t2, 0x151, zero
+
+##############################
+# Supervisor-Level Interrupts
+##############################
+
+# stopei
+# name
+# CHECK-INST: csrrs t1, stopei, zero
+# CHECK-ENC: encoding: [0x73,0x23,0xc0,0x15]
+# CHECK-INST-ALIAS: csrr t1, stopei
+# uimm12
+# CHECK-INST: csrrs t2, stopei, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0xc0,0x15]
+# CHECK-INST-ALIAS: csrr t2, stopei
+csrrs t1, stopei, zero
+# uimm12
+csrrs t2, 0x15C, zero
+
+# stopi
+# name
+# CHECK-INST: csrrs t1, stopi, zero
+# CHECK-ENC: encoding: [0x73,0x23,0x00,0xdb]
+# CHECK-INST-ALIAS: csrr t1, stopi
+# uimm12
+# CHECK-INST: csrrs t2, stopi, zero
+# CHECK-ENC: encoding: [0xf3,0x23,0x00,0xdb]
+# CHECK-INST-ALIAS: csrr t2, stopi
+csrrs t1, stopi, zero
+# uimm12
+csrrs t2, 0xDB0, zero
 
 #########################################
 # Supervisor Protection and Translation