Add disasm for vshl (register) on arm

Change-Id: Ib07ad54ef20877597dcf50a995a8f8a8e8dcb1c3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809816Reviewed-by: Martyn Capewell <martyn.capewell@arm.com>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63877}

src/diagnostics/arm/disasm-arm.cc

@@ -1890,6 +1890,17 @@ void Decoder::DecodeSpecialCondition(Instruction* instr) {
                        op, size, Vd, Vn, Vm);
           break;
         }
+        case 0x4: {
+          if (instr->Bit(4) == 0) {
+            // vshl.s<size> Qd, Qm, Qn.
+            out_buffer_pos_ +=
+                SNPrintF(out_buffer_ + out_buffer_pos_,
+                         "vshl.s%d q%d, q%d, q%d", size, Vd, Vm, Vn);
+          } else {
+            Unknown(instr);
+          }
+          break;
+        }
         case 0x6: {
           // vmin/vmax.s<size> Qd, Qm, Qn.
           const char* op = instr->Bit(4) == 1 ? "vmin" : "vmax";
@@ -2083,6 +2094,17 @@ void Decoder::DecodeSpecialCondition(Instruction* instr) {
                        op, size, Vd, Vn, Vm);
           break;
         }
+        case 0x4: {
+          if (instr->Bit(4) == 0) {
+            // vshl.u<size> Qd, Qm, Qn.
+            out_buffer_pos_ +=
+                SNPrintF(out_buffer_ + out_buffer_pos_,
+                         "vshl.u%d q%d, q%d, q%d", size, Vd, Vm, Vn);
+          } else {
+            Unknown(instr);
+          }
+          break;
+        }
         case 0x6: {
           // vmin/vmax.u<size> Qd, Qm, Qn.
           const char* op = instr->Bit(4) == 1 ? "vmin" : "vmax";

test/cctest/test-disasm-arm.cc

@@ -1166,6 +1166,12 @@ TEST(Neon) {
               "f2dae550       vshl.i16 q15, q0, #10");
       COMPARE(vshl(NeonS32, q15, q0, 17),
               "f2f1e550       vshl.i32 q15, q0, #17");
+      COMPARE(vshl(NeonS8, q15, q0, q1),
+              "f242e440       vshl.s8 q15, q0, q1");
+      COMPARE(vshl(NeonU16, q15, q2, q3),
+              "f356e444       vshl.u16 q15, q2, q3");
+      COMPARE(vshl(NeonS32, q15, q4, q5),
+              "f26ae448       vshl.s32 q15, q4, q5");
       COMPARE(vshr(NeonS8, q15, q0, 6),
               "f2cae050       vshr.s8 q15, q0, #6");
       COMPARE(vshr(NeonU16, q15, q0, 10),