[ia32] Better code generation for materialization of float/double constants.

src/ia32/disasm-ia32.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <assert.h>
 #include <stdarg.h>
 #include <stdio.h>
 
 #include "src/v8.h"
 
@@ skipping 1368 matching lines @@
             data++;
             AppendToBuffer("nop");  // 2 byte nop.
           } else if (*data == 0xF3) {
             data++;
             int mod, regop, rm;
             get_modrm(*data, &mod, &regop, &rm);
             AppendToBuffer("psllq %s,%s",
                            NameOfXMMRegister(regop),
                            NameOfXMMRegister(rm));
             data++;
+          } else if (*data == 0x72) {
+            data++;
+            int mod, regop, rm;
+            get_modrm(*data, &mod, &regop, &rm);
+            int8_t imm8 = static_cast<int8_t>(data[1]);
+            DCHECK(regop == esi || regop == edx);
+            AppendToBuffer("%s %s,%d", (regop == esi) ? "pslld" : "psrld",
+                           NameOfXMMRegister(rm), static_cast<int>(imm8));
+            data += 2;
           } else if (*data == 0x73) {
             data++;
             int mod, regop, rm;
             get_modrm(*data, &mod, &regop, &rm);
             int8_t imm8 = static_cast<int8_t>(data[1]);
             DCHECK(regop == esi || regop == edx);
             AppendToBuffer("%s %s,%d",
                            (regop == esi) ? "psllq" : "psrlq",
                            NameOfXMMRegister(rm),
                            static_cast<int>(imm8));
@@ skipping 371 matching lines @@
       fprintf(f, "  ");
     }
     fprintf(f, "  %s\n", buffer.start());
   }
 }
 
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_IA32