Index: llvm/trunk/lib/Target/RISCV/RISCVInstrInfo.td
===================================================================
--- llvm/trunk/lib/Target/RISCV/RISCVInstrInfo.td
+++ llvm/trunk/lib/Target/RISCV/RISCVInstrInfo.td
@@ -550,6 +550,37 @@
 def : InstAlias<"sfence.vma",     (SFENCE_VMA      X0, X0)>;
 def : InstAlias<"sfence.vma $rs", (SFENCE_VMA GPR:$rs, X0)>;
 
+let EmitPriority = 0 in {
+def : InstAlias<"add $rd, $rs1, $imm12",
+                (ADDI  GPR:$rd, GPR:$rs1, simm12:$imm12)>;
+def : InstAlias<"and $rd, $rs1, $imm12",
+                (ANDI  GPR:$rd, GPR:$rs1, simm12:$imm12)>;
+def : InstAlias<"xor $rd, $rs1, $imm12",
+                (XORI  GPR:$rd, GPR:$rs1, simm12:$imm12)>;
+def : InstAlias<"or $rd, $rs1, $imm12",
+                (ORI  GPR:$rd, GPR:$rs1, simm12:$imm12)>;
+def : InstAlias<"sll $rd, $rs1, $shamt",
+                (SLLI  GPR:$rd, GPR:$rs1, uimmlog2xlen:$shamt)>;
+def : InstAlias<"srl $rd, $rs1, $shamt",
+                (SRLI  GPR:$rd, GPR:$rs1, uimmlog2xlen:$shamt)>;
+def : InstAlias<"sra $rd, $rs1, $shamt",
+                (SRAI  GPR:$rd, GPR:$rs1, uimmlog2xlen:$shamt)>;
+let Predicates = [IsRV64] in {
+def : InstAlias<"addw $rd, $rs1, $imm12",
+                (ADDIW  GPR:$rd, GPR:$rs1, simm12:$imm12)>;
+def : InstAlias<"sllw $rd, $rs1, $shamt",
+                (SLLIW  GPR:$rd, GPR:$rs1, uimm5:$shamt)>;
+def : InstAlias<"srlw $rd, $rs1, $shamt",
+                (SRLIW  GPR:$rd, GPR:$rs1, uimm5:$shamt)>;
+def : InstAlias<"sraw $rd, $rs1, $shamt",
+                (SRAIW  GPR:$rd, GPR:$rs1, uimm5:$shamt)>;
+} // Predicates = [IsRV64]
+def : InstAlias<"slt $rd, $rs1, $imm12",
+                (SLTI  GPR:$rd, GPR:$rs1, simm12:$imm12)>;
+def : InstAlias<"sltu $rd, $rs1, $imm12",
+                (SLTIU  GPR:$rd, GPR:$rs1, simm12:$imm12)>;
+}
+
 //===----------------------------------------------------------------------===//
 // Pseudo-instructions and codegen patterns
 //
Index: llvm/trunk/test/MC/RISCV/rv32i-aliases-invalid.s
===================================================================
--- llvm/trunk/test/MC/RISCV/rv32i-aliases-invalid.s
+++ llvm/trunk/test/MC/RISCV/rv32i-aliases-invalid.s
@@ -11,5 +11,13 @@
 negw x1, x2   # CHECK: :[[@LINE]]:1: error: instruction use requires an option to be enabled
 sext.w x3, x4 # CHECK: :[[@LINE]]:1: error: instruction use requires an option to be enabled
 
+sll x2, x3, 32  # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [0, 31]
+srl x2, x3, 32  # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [0, 31]
+sra x2, x3, 32  # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [0, 31]
+
+sll x2, x3, -1  # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [0, 31]
+srl x2, x3, -2  # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [0, 31]
+sra x2, x3, -3  # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [0, 31]
+
 foo:
   .space 4
Index: llvm/trunk/test/MC/RISCV/rv32i-invalid.s
===================================================================
--- llvm/trunk/test/MC/RISCV/rv32i-invalid.s
+++ llvm/trunk/test/MC/RISCV/rv32i-invalid.s
@@ -69,6 +69,7 @@
 ori a0, a1, %hi(foo) # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [-2048, 2047]
 andi ra, sp, %pcrel_hi(123) # CHECK: :[[@LINE]]:14: error: immediate must be an integer in the range [-2048, 2047]
 xori a2, a3, %hi(345) # CHECK: :[[@LINE]]:14: error: immediate must be an integer in the range [-2048, 2047]
+add a1, a2, (a3) # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [-2048, 2047]
 
 ## uimm12
 csrrw a0, %lo(1), a0 # CHECK: :[[@LINE]]:11: error: immediate must be an integer in the range [0, 4095]
@@ -126,7 +127,6 @@
 # Invalid operand types
 xori sp, 22, 220 # CHECK: :[[@LINE]]:10: error: invalid operand for instruction
 sub t0, t2, 1 # CHECK: :[[@LINE]]:13: error: invalid operand for instruction
-add a1, a2, (a3) # CHECK: :[[@LINE]]:13: error: invalid operand for instruction
 
 # Too many operands
 add ra, zero, zero, zero # CHECK: :[[@LINE]]:21: error: invalid operand for instruction
Index: llvm/trunk/test/MC/RISCV/rv64i-aliases-invalid.s
===================================================================
--- llvm/trunk/test/MC/RISCV/rv64i-aliases-invalid.s
+++ llvm/trunk/test/MC/RISCV/rv64i-aliases-invalid.s
@@ -8,5 +8,21 @@
 rdcycleh x27   # CHECK: :[[@LINE]]:1: error: instruction use requires an option to be enabled
 rdtimeh x28    # CHECK: :[[@LINE]]:1: error: instruction use requires an option to be enabled
 
+sll x2, x3, 64  # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [0, 63]
+srl x2, x3, 64  # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [0, 63]
+sra x2, x3, 64  # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [0, 63]
+
+sll x2, x3, -1  # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [0, 63]
+srl x2, x3, -2  # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [0, 63]
+sra x2, x3, -3  # CHECK: :[[@LINE]]:13: error: immediate must be an integer in the range [0, 63]
+
+sllw x2, x3, 32  # CHECK: :[[@LINE]]:14: error: immediate must be an integer in the range [0, 31]
+srlw x2, x3, 32  # CHECK: :[[@LINE]]:14: error: immediate must be an integer in the range [0, 31]
+sraw x2, x3, 32  # CHECK: :[[@LINE]]:14: error: immediate must be an integer in the range [0, 31]
+
+sllw x2, x3, -1  # CHECK: :[[@LINE]]:14: error: immediate must be an integer in the range [0, 31]
+srlw x2, x3, -2  # CHECK: :[[@LINE]]:14: error: immediate must be an integer in the range [0, 31]
+sraw x2, x3, -3  # CHECK: :[[@LINE]]:14: error: immediate must be an integer in the range [0, 31]
+
 foo:
   .space 8
Index: llvm/trunk/test/MC/RISCV/rv64i-aliases-valid.s
===================================================================
--- llvm/trunk/test/MC/RISCV/rv64i-aliases-valid.s
+++ llvm/trunk/test/MC/RISCV/rv64i-aliases-valid.s
@@ -111,3 +111,21 @@
 # CHECK-INST: addiw t6, ra, 0
 # CHECK-ALIAS: sext.w t6, ra
 sext.w x31, x1
+
+# The following aliases are accepted as input but the canonical form
+# of the instruction will always be printed.
+# CHECK-INST: addiw a2, a3, 4
+# CHECK-ALIAS: addiw a2, a3, 4
+addw a2,a3,4
+
+# CHECK-INST: slliw a2, a3, 4
+# CHECK-ALIAS: slliw a2, a3, 4
+sllw a2,a3,4
+
+# CHECK-INST: srliw a2, a3, 4
+# CHECK-ALIAS: srliw a2, a3, 4
+srlw a2,a3,4
+
+# CHECK-INST: sraiw a2, a3, 4
+# CHECK-ALIAS: sraiw a2, a3, 4
+sraw a2,a3,4
Index: llvm/trunk/test/MC/RISCV/rvi-aliases-valid.s
===================================================================
--- llvm/trunk/test/MC/RISCV/rvi-aliases-valid.s
+++ llvm/trunk/test/MC/RISCV/rvi-aliases-valid.s
@@ -155,3 +155,41 @@
 # CHECK-INST: sfence.vma a0, zero
 # CHECK-ALIAS: sfence.vma a0
 sfence.vma a0
+
+# The following aliases are accepted as input but the canonical form
+# of the instruction will always be printed.
+# CHECK-INST: addi a2, a3, 4
+# CHECK-ALIAS: addi a2, a3, 4
+add a2,a3,4
+
+# CHECK-INST: andi a2, a3, 4
+# CHECK-ALIAS: andi a2, a3, 4
+and a2,a3,4
+
+# CHECK-INST: xori a2, a3, 4
+# CHECK-ALIAS: xori a2, a3, 4
+xor a2,a3,4
+
+# CHECK-INST: ori a2, a3, 4
+# CHECK-ALIAS: ori a2, a3, 4
+or a2,a3,4
+
+# CHECK-INST: slli a2, a3, 4
+# CHECK-ALIAS: slli a2, a3, 4
+sll a2,a3,4
+
+# CHECK-INST: srli a2, a3, 4
+# CHECK-ALIAS: srli a2, a3, 4
+srl a2,a3,4
+
+# CHECK-INST: srai a2, a3, 4
+# CHECK-ALIAS: srai a2, a3, 4
+sra a2,a3,4
+
+# CHECK-INST: slti a2, a3, 4
+# CHECK-ALIAS: slti a2, a3, 4
+slt a2,a3,4
+
+# CHECK-INST: sltiu a2, a3, 4
+# CHECK-ALIAS: sltiu a2, a3, 4
+sltu a2,a3,4