-/// getSpecialAddressLatency - For targets where it is beneficial to
-/// backschedule instructions that compute addresses, return a value
-/// indicating the number of scheduling cycles of backscheduling that
-/// should be attempted.
-unsigned X86Subtarget::getSpecialAddressLatency() const {
- // For x86 out-of-order targets, back-schedule address computations so
- // that loads and stores aren't blocked.
- // This value was chosen arbitrarily.
- return 200;
-}
-
-/// GetCpuIDAndInfo - Execute the specified cpuid and return the 4 values in the
-/// specified arguments. If we can't run cpuid on the host, return true.
-static bool GetCpuIDAndInfo(unsigned value, unsigned *rEAX,
- unsigned *rEBX, unsigned *rECX, unsigned *rEDX) {
-#if defined(__x86_64__) || defined(_M_AMD64) || defined (_M_X64)
- #if defined(__GNUC__)
- // gcc doesn't know cpuid would clobber ebx/rbx. Preseve it manually.
- asm ("movq\t%%rbx, %%rsi\n\t"
- "cpuid\n\t"
- "xchgq\t%%rbx, %%rsi\n\t"
- : "=a" (*rEAX),
- "=S" (*rEBX),
- "=c" (*rECX),
- "=d" (*rEDX)
- : "a" (value));
- return false;
- #elif defined(_MSC_VER)
- int registers[4];
- __cpuid(registers, value);
- *rEAX = registers[0];
- *rEBX = registers[1];
- *rECX = registers[2];
- *rEDX = registers[3];
- return false;
- #endif
-#elif defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
- #if defined(__GNUC__)
- asm ("movl\t%%ebx, %%esi\n\t"
- "cpuid\n\t"
- "xchgl\t%%ebx, %%esi\n\t"
- : "=a" (*rEAX),
- "=S" (*rEBX),
- "=c" (*rECX),
- "=d" (*rEDX)
- : "a" (value));
- return false;
- #elif defined(_MSC_VER)
- __asm {
- mov eax,value
- cpuid
- mov esi,rEAX
- mov dword ptr [esi],eax
- mov esi,rEBX
- mov dword ptr [esi],ebx
- mov esi,rECX
- mov dword ptr [esi],ecx
- mov esi,rEDX
- mov dword ptr [esi],edx
- }
- return false;
- #endif
-#endif
- return true;
-}
-
-static void DetectFamilyModel(unsigned EAX, unsigned &Family, unsigned &Model) {
- Family = (EAX >> 8) & 0xf; // Bits 8 - 11
- Model = (EAX >> 4) & 0xf; // Bits 4 - 7
- if (Family == 6 || Family == 0xf) {
- if (Family == 0xf)
- // Examine extended family ID if family ID is F.
- Family += (EAX >> 20) & 0xff; // Bits 20 - 27
- // Examine extended model ID if family ID is 6 or F.
- Model += ((EAX >> 16) & 0xf) << 4; // Bits 16 - 19
- }
-}
-