Add X86 feature detection support for BMI instructions. Added new cpuid function for accessing leafs with sub leafs specified in ECX. Also added code to keep track of the max cpuid level supported in both basic and extended leaves and qualified the existing cpuid calls and the new call to leaf 7.
llvm-svn: 142089
diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp b/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
index f98d5e3..7cdd5b1 100644
--- a/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
@@ -107,6 +107,74 @@
return true;
}
+/// GetCpuIDAndInfoEx - Execute the specified cpuid with subleaf and return the
+/// 4 values in the specified arguments. If we can't run cpuid on the host,
+/// return true.
+bool X86_MC::GetCpuIDAndInfoEx(unsigned value, unsigned subleaf, unsigned *rEAX,
+ unsigned *rEBX, unsigned *rECX, unsigned *rEDX) {
+#if defined(__x86_64__) || defined(_M_AMD64) || defined (_M_X64)
+ #if defined(__GNUC__)
+ // gcc desn'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),
+ "c" (subleaf));
+ return false;
+ #elif defined(_MSC_VER)
+ // can't use __cpuidex because it isn't available in all supported versions
+ // of MSC
+ __asm {
+ mov eax,value
+ mov ecx,subleaf
+ cpuid
+ mov rsi,rEAX
+ mov dword ptr [rsi],eax
+ mov rsi,rEBX
+ mov dword ptr [rsi],ebx
+ mov rsi,rECX
+ mov dword ptr [rsi],ecx
+ mov rsi,rEDX
+ mov dword ptr [rsi],edx
+ }
+ 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),
+ "c" (subleaf));
+ return false;
+ #elif defined(_MSC_VER)
+ __asm {
+ mov eax,value
+ mov ecx,subleaf
+ 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;
+}
+
void X86_MC::DetectFamilyModel(unsigned EAX, unsigned &Family,
unsigned &Model) {
Family = (EAX >> 8) & 0xf; // Bits 8 - 11