Index: lib/Target/AArch64/AArch64SVEInstrInfo.td
===================================================================
--- lib/Target/AArch64/AArch64SVEInstrInfo.td
+++ lib/Target/AArch64/AArch64SVEInstrInfo.td
@@ -230,6 +230,18 @@
   defm ST1W_D_IMM : sve_mem_cst_si<0b10, 0b11, "st1w", Z_d, ZPR64>;
   defm ST1D_IMM   : sve_mem_cst_si<0b11, 0b11, "st1d", Z_d, ZPR64>;
 
+  // contiguous store with reg+reg addressing.
+  defm ST1B   : sve_mem_cst_ss<0b0000, "st1b", Z_b, ZPR8,  GPR64NoXZRshifted8>;
+  defm ST1B_H : sve_mem_cst_ss<0b0001, "st1b", Z_h, ZPR16, GPR64NoXZRshifted8>;
+  defm ST1B_S : sve_mem_cst_ss<0b0010, "st1b", Z_s, ZPR32, GPR64NoXZRshifted8>;
+  defm ST1B_D : sve_mem_cst_ss<0b0011, "st1b", Z_d, ZPR64, GPR64NoXZRshifted8>;
+  defm ST1H   : sve_mem_cst_ss<0b0101, "st1h", Z_h, ZPR16, GPR64NoXZRshifted16>;
+  defm ST1H_S : sve_mem_cst_ss<0b0110, "st1h", Z_s, ZPR32, GPR64NoXZRshifted16>;
+  defm ST1H_D : sve_mem_cst_ss<0b0111, "st1h", Z_d, ZPR64, GPR64NoXZRshifted16>;
+  defm ST1W   : sve_mem_cst_ss<0b1010, "st1w", Z_s, ZPR32, GPR64NoXZRshifted32>;
+  defm ST1W_D : sve_mem_cst_ss<0b1011, "st1w", Z_d, ZPR64, GPR64NoXZRshifted32>;
+  defm ST1D   : sve_mem_cst_ss<0b1111, "st1d", Z_d, ZPR64, GPR64NoXZRshifted64>;
+
  // ST{2,3,4}{B,H,W,D} with immediate
   defm ST2B_IMM : sve_mem_est_si<0b00, 0b01, ZZ_b,   "st2b", simm4Scale2MulVl>;
   defm ST3B_IMM : sve_mem_est_si<0b00, 0b10, ZZZ_b,  "st3b", simm4Scale3MulVl>;
Index: lib/Target/AArch64/SVEInstrFormats.td
===================================================================
--- lib/Target/AArch64/SVEInstrFormats.td
+++ lib/Target/AArch64/SVEInstrFormats.td
@@ -602,6 +602,36 @@
                   (!cast<Instruction>(NAME) VecList:$Zt, PPR3bAny:$Pg, GPR64sp:$Rn, 0), 1>;
 }
 
+class sve_mem_cst_ss_base<bits<4> dtype, string asm,
+                          RegisterOperand listty, RegisterOperand gprty>
+: I<(outs), (ins listty:$Zt, PPR3bAny:$Pg, GPR64sp:$Rn, gprty:$Rm),
+  asm, "\t$Zt, $Pg, [$Rn, $Rm]",
+  "",
+  []>, Sched<[]> {
+  bits<3> Pg;
+  bits<5> Rm;
+  bits<5> Rn;
+  bits<5> Zt;
+  let Inst{31-25} = 0b1110010;
+  let Inst{24-21} = dtype;
+  let Inst{20-16} = Rm;
+  let Inst{15-13} = 0b010;
+  let Inst{12-10} = Pg;
+  let Inst{9-5}   = Rn;
+  let Inst{4-0}   = Zt;
+
+  let mayStore = 1;
+}
+
+multiclass sve_mem_cst_ss<bits<4> dtype, string asm,
+                          RegisterOperand listty, ZPRRegOp zprty,
+                          RegisterOperand gprty> {
+  def NAME : sve_mem_cst_ss_base<dtype, asm, listty, gprty>;
+
+  def : InstAlias<asm # "\t$Zt, $Pg, [$Rn, $Rm]",
+                  (!cast<Instruction>(NAME) zprty:$Zt, PPR3bAny:$Pg, GPR64sp:$Rn, gprty:$Rm), 0>;
+}
+
 //===----------------------------------------------------------------------===//
 // SVE Permute - Predicates Group
 //===----------------------------------------------------------------------===//
@@ -958,4 +988,4 @@
                  (!cast<Instruction>(NAME # _IMM_REAL) ZPR64:$Zt, PPR3bAny:$Pg, ZPR64:$Zn, imm_ty:$imm5), 0>;
   def : InstAlias<asm # "\t$Zt, $Pg/z, [$Zn]",
                   (!cast<Instruction>(NAME # _IMM_REAL) Z_d:$Zt, PPR3bAny:$Pg, ZPR64:$Zn, 0), 1>;
-}
\ No newline at end of file
+}
Index: test/MC/AArch64/SVE/st1b-diagnostics.s
===================================================================
--- test/MC/AArch64/SVE/st1b-diagnostics.s
+++ test/MC/AArch64/SVE/st1b-diagnostics.s
@@ -83,3 +83,27 @@
 // CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand
 // CHECK-NEXT: st1b { v0.16b }, p0, [x0]
 // CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+
+// --------------------------------------------------------------------------//
+// Invalid scalar + scalar addressing modes
+
+st1b z0.b, p0, [x0, xzr]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 without shift
+// CHECK-NEXT: st1b z0.b, p0, [x0, xzr]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1b z0.b, p0, [x0, x0, lsl #1]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 without shift
+// CHECK-NEXT: st1b z0.b, p0, [x0, x0, lsl #1]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1b z0.b, p0, [x0, w0]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 without shift
+// CHECK-NEXT: st1b z0.b, p0, [x0, w0]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1b z0.b, p0, [x0, w0, uxtw]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 without shift
+// CHECK-NEXT: st1b z0.b, p0, [x0, w0, uxtw]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
Index: test/MC/AArch64/SVE/st1b.s
===================================================================
--- test/MC/AArch64/SVE/st1b.s
+++ test/MC/AArch64/SVE/st1b.s
@@ -102,3 +102,27 @@
 // CHECK-ENCODING: [0x55,0xf5,0x65,0xe4]
 // CHECK-ERROR: instruction requires: sve
 // CHECK-UNKNOWN: 55 f5 65 e4 <unknown>
+
+st1b    { z0.b }, p0, [x0, x0]
+// CHECK-INST: st1b    { z0.b }, p0, [x0, x0]
+// CHECK-ENCODING: [0x00,0x40,0x00,0xe4]
+// CHECK-ERROR: instruction requires: sve
+// CHECK-UNKNOWN: 00 40 00 e4 <unknown>
+
+st1b    { z0.h }, p0, [x0, x0]
+// CHECK-INST: st1b    { z0.h }, p0, [x0, x0]
+// CHECK-ENCODING: [0x00,0x40,0x20,0xe4]
+// CHECK-ERROR: instruction requires: sve
+// CHECK-UNKNOWN: 00 40 20 e4 <unknown>
+
+st1b    { z0.s }, p0, [x0, x0]
+// CHECK-INST: st1b    { z0.s }, p0, [x0, x0]
+// CHECK-ENCODING: [0x00,0x40,0x40,0xe4]
+// CHECK-ERROR: instruction requires: sve
+// CHECK-UNKNOWN: 00 40 40 e4 <unknown>
+
+st1b    { z0.d }, p0, [x0, x0]
+// CHECK-INST: st1b    { z0.d }, p0, [x0, x0]
+// CHECK-ENCODING: [0x00,0x40,0x60,0xe4]
+// CHECK-ERROR: instruction requires: sve
+// CHECK-UNKNOWN: 00 40 60 e4 <unknown>
Index: test/MC/AArch64/SVE/st1d-diagnostics.s
===================================================================
--- test/MC/AArch64/SVE/st1d-diagnostics.s
+++ test/MC/AArch64/SVE/st1d-diagnostics.s
@@ -39,3 +39,32 @@
 // CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand
 // CHECK-NEXT: st1d { v0.2d }, p0, [x0]
 // CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+
+// --------------------------------------------------------------------------//
+// Invalid scalar + scalar addressing modes
+
+st1d z0.d, p0, [x0, x0]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #3'
+// CHECK-NEXT: st1d z0.d, p0, [x0, x0]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1d z0.d, p0, [x0, xzr]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #3'
+// CHECK-NEXT: st1d z0.d, p0, [x0, xzr]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1d z0.d, p0, [x0, x0, lsl #2]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #3'
+// CHECK-NEXT: st1d z0.d, p0, [x0, x0, lsl #2]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1d z0.d, p0, [x0, w0]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #3'
+// CHECK-NEXT: st1d z0.d, p0, [x0, w0]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1d z0.d, p0, [x0, w0, uxtw]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #3'
+// CHECK-NEXT: st1d z0.d, p0, [x0, w0, uxtw]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
Index: test/MC/AArch64/SVE/st1d.s
===================================================================
--- test/MC/AArch64/SVE/st1d.s
+++ test/MC/AArch64/SVE/st1d.s
@@ -30,3 +30,9 @@
 // CHECK-ENCODING: [0x55,0xf5,0xe5,0xe5]
 // CHECK-ERROR: instruction requires: sve
 // CHECK-UNKNOWN: 55 f5 e5 e5 <unknown>
+
+st1d    { z0.d }, p0, [x0, x0, lsl #3]
+// CHECK-INST: st1d    { z0.d }, p0, [x0, x0, lsl #3]
+// CHECK-ENCODING: [0x00,0x40,0xe0,0xe5]
+// CHECK-ERROR: instruction requires: sve
+// CHECK-UNKNOWN: 00 40 e0 e5 <unknown>
Index: test/MC/AArch64/SVE/st1h-diagnostics.s
===================================================================
--- test/MC/AArch64/SVE/st1h-diagnostics.s
+++ test/MC/AArch64/SVE/st1h-diagnostics.s
@@ -68,3 +68,32 @@
 // CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand
 // CHECK-NEXT: st1h { v0.8h }, p0, [x0]
 // CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+
+// --------------------------------------------------------------------------//
+// Invalid scalar + scalar addressing modes
+
+st1h z0.h, p0, [x0, x0]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #1'
+// CHECK-NEXT: st1h z0.h, p0, [x0, x0]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1h z0.h, p0, [x0, xzr]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #1'
+// CHECK-NEXT: st1h z0.h, p0, [x0, xzr]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1h z0.h, p0, [x0, x0, lsl #2]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #1'
+// CHECK-NEXT: st1h z0.h, p0, [x0, x0, lsl #2]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1h z0.h, p0, [x0, w0]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #1'
+// CHECK-NEXT: st1h z0.h, p0, [x0, w0]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1h z0.h, p0, [x0, w0, uxtw]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #1'
+// CHECK-NEXT: st1h z0.h, p0, [x0, w0, uxtw]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
Index: test/MC/AArch64/SVE/st1h.s
===================================================================
--- test/MC/AArch64/SVE/st1h.s
+++ test/MC/AArch64/SVE/st1h.s
@@ -78,3 +78,21 @@
 // CHECK-ENCODING: [0xff,0xff,0xef,0xe4]
 // CHECK-ERROR: instruction requires: sve
 // CHECK-UNKNOWN: ff ff ef e4 <unknown>
+
+st1h    { z0.h }, p0, [x0, x0, lsl #1]
+// CHECK-INST: st1h    { z0.h }, p0, [x0, x0, lsl #1]
+// CHECK-ENCODING: [0x00,0x40,0xa0,0xe4]
+// CHECK-ERROR: instruction requires: sve
+// CHECK-UNKNOWN: 00 40 a0 e4 <unknown>
+
+st1h    { z0.s }, p0, [x0, x0, lsl #1]
+// CHECK-INST: st1h    { z0.s }, p0, [x0, x0, lsl #1]
+// CHECK-ENCODING: [0x00,0x40,0xc0,0xe4]
+// CHECK-ERROR: instruction requires: sve
+// CHECK-UNKNOWN: 00 40 c0 e4 <unknown>
+
+st1h    { z0.d }, p0, [x0, x0, lsl #1]
+// CHECK-INST: st1h    { z0.d }, p0, [x0, x0, lsl #1]
+// CHECK-ENCODING: [0x00,0x40,0xe0,0xe4]
+// CHECK-ERROR: instruction requires: sve
+// CHECK-UNKNOWN: 00 40 e0 e4 <unknown>
Index: test/MC/AArch64/SVE/st1w-diagnostics.s
===================================================================
--- test/MC/AArch64/SVE/st1w-diagnostics.s
+++ test/MC/AArch64/SVE/st1w-diagnostics.s
@@ -56,3 +56,32 @@
 // CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand
 // CHECK-NEXT: st1w { v0.4s }, p0, [x0]
 // CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+
+// --------------------------------------------------------------------------//
+// Invalid scalar + scalar addressing modes
+
+st1w z0.s, p0, [x0, x0]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #2'
+// CHECK-NEXT: st1w z0.s, p0, [x0, x0]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1w z0.s, p0, [x0, xzr]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #2'
+// CHECK-NEXT: st1w z0.s, p0, [x0, xzr]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1w z0.s, p0, [x0, x0, lsl #3]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #2'
+// CHECK-NEXT: st1w z0.s, p0, [x0, x0, lsl #3]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1w z0.s, p0, [x0, w0]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #2'
+// CHECK-NEXT: st1w z0.s, p0, [x0, w0]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+st1w z0.s, p0, [x0, w0, uxtw]
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: register must be x0..x30 with required shift 'lsl #2'
+// CHECK-NEXT: st1w z0.s, p0, [x0, w0, uxtw]
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
Index: test/MC/AArch64/SVE/st1w.s
===================================================================
--- test/MC/AArch64/SVE/st1w.s
+++ test/MC/AArch64/SVE/st1w.s
@@ -54,3 +54,15 @@
 // CHECK-ENCODING: [0x55,0xf5,0x65,0xe5]
 // CHECK-ERROR: instruction requires: sve
 // CHECK-UNKNOWN: 55 f5 65 e5 <unknown>
+
+st1w    { z0.s }, p0, [x0, x0, lsl #2]
+// CHECK-INST: st1w    { z0.s }, p0, [x0, x0, lsl #2]
+// CHECK-ENCODING: [0x00,0x40,0x40,0xe5]
+// CHECK-ERROR: instruction requires: sve
+// CHECK-UNKNOWN: 00 40 40 e5 <unknown>
+
+st1w    { z0.d }, p0, [x0, x0, lsl #2]
+// CHECK-INST: st1w    { z0.d }, p0, [x0, x0, lsl #2]
+// CHECK-ENCODING: [0x00,0x40,0x60,0xe5]
+// CHECK-ERROR: instruction requires: sve
+// CHECK-UNKNOWN: 00 40 60 e5 <unknown>