maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

It appears the inline asm in GetCpuIDAndInfo() may clobbers some registers if it isn't inlined (at < -O3). Force it to be inlined. 

llvm-svn: 30762
This commit is contained in:
Evan Cheng 2006-10-06 07:50:56 +00:00
parent 469ea0c94d
commit 4c1a804a5b
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
llvm/lib/Target/X86/X86Subtarget.cpp
View File

@ -28,7 +28,7 @@ AsmWriterFlavor("x86-asm-syntax", cl::init(X86Subtarget::unset),
/// GetCpuIDAndInfo - Execute the specified cpuid and return the 4 values in the /// 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. /// specified arguments. If we can't run cpuid on the host, return true.
static bool GetCpuIDAndInfo(unsigned value, unsigned *rEAX, unsigned *rEBX, static inline bool GetCpuIDAndInfo(unsigned value, unsigned *rEAX, unsigned *rEBX,
unsigned *rECX, unsigned *rEDX) { unsigned *rECX, unsigned *rEDX) {
#if defined(__x86_64__) #if defined(__x86_64__)
asm ("pushq\t%%rbx\n\t" asm ("pushq\t%%rbx\n\t"
@ -76,8 +76,8 @@ static const char *GetCurrentX86CPU() {
unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0; unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
if (GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX)) if (GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX))
return "generic"; return "generic";
unsigned Family = (EAX & (0xffffffff >> (32 - 4)) << 8) >> 8; // Bits 8 - 11 unsigned Family = (EAX >> 8) & 0xf; // Bits 8 - 11
unsigned Model = (EAX & (0xffffffff >> (32 - 4)) << 4) >> 4; // Bits 4 - 7 unsigned Model = (EAX >> 4) & 0xf; // Bits 4 - 7
GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX); GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
bool Em64T = EDX & (1 << 29); bool Em64T = EDX & (1 << 29);