Implements ARM SIMD multiplication and subtraction instructions.

runtime/vm/disassembler_arm.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/disassembler.h"
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_ARM.
 #if defined(TARGET_ARCH_ARM)
 #include "platform/assert.h"
 
@@ skipping 513 matching lines @@
           return 8;
         }
       } else if (format[1] == 'v') {  // 'svc
         ASSERT(STRING_STARTS_WITH(format, "svc"));
         buffer_pos_ += OS::SNPrint(current_position_in_buffer(),
                                    remaining_size_in_buffer(),
                                    "0x%x",
                                    instr->SvcField());
         return 3;
       } else if (format[1] == 'z') {
-        // 'sz: Size field of SIMD instruction.
-        int sz = 8 << (instr->Bits(20, 2));
+        // 'sz: Size field of SIMD instructions.
+        int sz = instr->Bits(20, 2);
+        char const* sz_str;
+        switch (sz) {
+          case 0: sz_str = "b"; break;
+          case 1: sz_str = "h"; break;
+          case 2: sz_str = "w"; break;
+          case 3: sz_str = "l"; break;
+          default: sz_str = "?"; break;
+        }
         buffer_pos_ += OS::SNPrint(current_position_in_buffer(),
                                    remaining_size_in_buffer(),
-                                   "I%d",
-                                   sz);
+                                   "%s",
+                                   sz_str);
         return 2;
       } else if (format[1] == ' ') {
         // 's: S field of data processing instructions.
         if (instr->HasS()) {
           Print("s");
         }
         return 1;
       } else {
         return FormatSRegister(instr, format);
       }
@@ skipping 713 matching lines @@
   } else {
     Unknown(instr);
   }
 }
 
 
 void ARMDecoder::DecodeSIMDDataProcessing(Instr* instr) {
   ASSERT(instr->ConditionField() == kSpecialCondition);
   if (instr->Bit(6) == 1) {
     if ((instr->Bits(8, 4) == 8) && (instr->Bit(4) == 0) &&
-        (instr->Bit(24) == 0)) {
-      Format(instr, "vadd.'sz 'qd, 'qn, 'qm");
+        (instr->Bits(23, 2) == 0)) {
+      Format(instr, "vaddqi'sz 'qd, 'qn, 'qm");

[regis, 2013/07/16 16:57:38]

Isn't the 'i' redundant, since it is replaced by b, h, or w?

     } else if ((instr->Bits(8, 4) == 13) && (instr->Bit(4) == 0) &&
-        (instr->Bit(24) == 0)) {
-      Format(instr, "vadd.F32 'qd, 'qn, 'qm");
+               (instr->Bits(23, 2) == 0) && (instr->Bit(21) == 0)) {
+      Format(instr, "vaddqs 'qd, 'qn, 'qm");
+    } else if ((instr->Bits(8, 4) == 8) && (instr->Bit(4) == 0) &&
+               (instr->Bits(23, 2) == 2)) {
+      Format(instr, "vsubqi'sz 'qd, 'qn, 'qm");
+    } else if ((instr->Bits(8, 4) == 13) && (instr->Bit(4) == 0) &&
+               (instr->Bits(23, 2) == 0) && (instr->Bit(21) == 1)) {
+      Format(instr, "vsubqs 'qd, 'qn, 'qm");
+    } else if ((instr->Bits(8, 4) == 9) && (instr->Bit(4) == 1) &&
+               (instr->Bits(23, 2) == 0)) {
+      Format(instr, "vmulqi'sz 'qd, 'qn, 'qm");
+    } else if ((instr->Bits(8, 4) == 13) && (instr->Bit(4) == 1) &&
+               (instr->Bits(23, 2) == 2) && (instr->Bit(21) == 0)) {
+      Format(instr, "vmulqs 'qd, 'qn, 'qm");
     } else {
       Unknown(instr);
     }
   } else {
     Unknown(instr);
   }
 }
 
 
 void ARMDecoder::InstructionDecode(uword pc) {
@@ skipping 91 matching lines @@
                                   human_buffer,
                                   sizeof(human_buffer),
                                   pc);
     pc += instruction_length;
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM