使用C ++代码中的嵌入式汇编语言进行错误分析

Question

我发现这篇关于std::vector::push_back效率的文章 ，相关代码可以在这里找到。 我自己尝试了一下，但收到了一条illegal instruction (core dumped) ，gdb指示错误发生在第37行。

我在以下计算机上使用gcc 4.7.2进行了编译：

$ sudo dmidecode -t processor
# dmidecode 2.11
SMBIOS 2.5 present.

Handle 0x0400, DMI type 4, 40 bytes
Processor Information
    Socket Designation: CPU
    Type: Central Processor
    Family: Core 2 Duo
    Manufacturer: Intel
    ID: 7A 06 01 00 FF FB EB BF
    Signature: Type 0, Family 6, Model 23, Stepping 10
    Flags:
        FPU (Floating-point unit on-chip)
        VME (Virtual mode extension)
        DE (Debugging extension)
        PSE (Page size extension)
        TSC (Time stamp counter)
        MSR (Model specific registers)
        PAE (Physical address extension)
        MCE (Machine check exception)
        CX8 (CMPXCHG8 instruction supported)
        APIC (On-chip APIC hardware supported)
        SEP (Fast system call)
        MTRR (Memory type range registers)
        PGE (Page global enable)
        MCA (Machine check architecture)
        CMOV (Conditional move instruction supported)
        PAT (Page attribute table)
        PSE-36 (36-bit page size extension)
        CLFSH (CLFLUSH instruction supported)
        DS (Debug store)
        ACPI (ACPI supported)
        MMX (MMX technology supported)
        FXSR (FXSAVE and FXSTOR instructions supported)
        SSE (Streaming SIMD extensions)
        SSE2 (Streaming SIMD extensions 2)
        SS (Self-snoop)
        HTT (Multi-threading)
        TM (Thermal monitor supported)
        PBE (Pending break enabled)
    Version: Not Specified
    Voltage: 1.2 V
    External Clock: 1333 MHz
    Max Speed: 5200 MHz
    Current Speed: 3000 MHz
    Status: Populated, Enabled
    Upgrade: Socket LGA775
    L1 Cache Handle: 0x0700
    L2 Cache Handle: 0x0701
    L3 Cache Handle: Not Provided
    Serial Number: Not Specified
    Asset Tag: Not Specified
    Part Number: Not Specified
    Core Count: 2
    Core Enabled: 2
    Thread Count: 2
    Characteristics:
        64-bit capable

这里有什么问题？ 如何使此代码起作用？ 我也尝试使用icpc 13.1.0，但这也失败了。

编辑：我正在使用Ubuntu 12.10 64位。

Answer 1

您的CPU不支持RDTSCP指令。 这是Core i7指令，您的处理器是更早的一代（ Merom-L ）。

您应该可以改用RDTSC 。 例如，请参见rdtscp，rdtsc：内存和cpuid / rdtsc之间的区别？