Custom call IC for Math.floor.

src/ia32/disasm-ia32.cc

Index: src/ia32/disasm-ia32.cc
diff --git a/src/ia32/disasm-ia32.cc b/src/ia32/disasm-ia32.cc
index 64305ef69e9b82e84f13ed4268067f099d34b30e..f4956223c57a446b3ba0a5b94bb09b37a4a17f2a 100644
--- a/src/ia32/disasm-ia32.cc
+++ b/src/ia32/disasm-ia32.cc
@@ -1156,6 +1156,15 @@ int DisassemblerIA32::InstructionDecode(v8::internal::Vector<char> out_buffer,
                             NameOfXMMRegister(regop),
                             NameOfXMMRegister(rm));
              data++;
+          } else if (*data == 0x73) {
+             data++;
+             int mod, regop, rm;
+             get_modrm(*data, &mod, &regop, &rm);
+             int8_t imm8 = *reinterpret_cast<int8_t*>(data + 1);

[Erik Corry, 2010/09/20 11:56:50]

Why not just:
int imm8 = data[1];
?

[Vitaly Repeshko, 2010/09/21 12:54:49]

Almost done. I left static_cast there to avoid unsigned to signed warnings.

+             AppendToBuffer("psllq %s,%d",
+                            NameOfXMMRegister(rm),
+                            static_cast<int>(imm8));
+             data += 2;;
           } else {
             UnimplementedInstruction();
           }