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Fix for x86-64 support: Removed pop/push instructions from the cpu detection algorithm.

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This commit is contained in:
oparviai 2009-02-13 16:22:48 +00:00
parent 28aaff6c99
commit 8f880269e0
2 changed files with 10 additions and 8 deletions
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9
source/SoundTouch/cpu_detect_x86_gcc.cpp
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@ -87,22 +87,21 @@ uint detectCPUextensions(void)
// check if 'cpuid' instructions is available by toggling eflags bit 21 // check if 'cpuid' instructions is available by toggling eflags bit 21
"\n\tpushf" // save eflags to stack "\n\tpushf" // save eflags to stack
"\n\tpop %%eax" // load eax from stack (with eflags) "\n\tmovl (%%esp), %%eax" // load eax from stack (with eflags)
"\n\tmovl %%eax, %%ecx" // save the original eflags values to ecx "\n\tmovl %%eax, %%ecx" // save the original eflags values to ecx
"\n\txor $0x00200000, %%eax" // toggle bit 21 "\n\txor $0x00200000, %%eax" // toggle bit 21
"\n\tpush %%eax" // store toggled eflags to stack "\n\tmovl %%eax, (%%esp)" // store toggled eflags to stack
"\n\tpopf" // load eflags from stack "\n\tpopf" // load eflags from stack
"\n\tpushf" // save updated eflags to stack "\n\tpushf" // save updated eflags to stack
"\n\tpop %%eax" // load from stack "\n\tmovl (%%esp), %%eax" // load eax from stack
"\n\tpopf" // pop stack to restore esp
"\n\txor %%edx, %%edx" // clear edx for defaulting no mmx "\n\txor %%edx, %%edx" // clear edx for defaulting no mmx
"\n\tcmp %%ecx, %%eax" // compare to original eflags values "\n\tcmp %%ecx, %%eax" // compare to original eflags values
"\n\tjz end" // jumps to 'end' if cpuid not present "\n\tjz end" // jumps to 'end' if cpuid not present
// cpuid instruction available, test for presence of mmx instructions // cpuid instruction available, test for presence of mmx instructions
"\n\tmovl $1, %%eax" "\n\tmovl $1, %%eax"
"\n\tcpuid" "\n\tcpuid"
// movl $0x00800000, %edx // force enable MMX
"\n\ttest $0x00800000, %%edx" "\n\ttest $0x00800000, %%edx"
"\n\tjz end" // branch if MMX not available "\n\tjz end" // branch if MMX not available

9
source/SoundTouch/cpu_detect_x86_win.cpp
View File

@ -78,13 +78,16 @@ uint detectCPUextensions(void)
xor esi, esi ; clear esi = result register xor esi, esi ; clear esi = result register
pushfd ; save eflags to stack pushfd ; save eflags to stack
pop eax ; load eax from stack (with eflags) mov eax,dword ptr [esp] ; load eax from stack (with eflags)
mov ecx, eax ; save the original eflags values to ecx mov ecx, eax ; save the original eflags values to ecx
xor eax, 0x00200000 ; toggle bit 21 xor eax, 0x00200000 ; toggle bit 21
push eax ; store toggled eflags to stack mov dword ptr [esp],eax ; store toggled eflags to stack
popfd ; load eflags from stack popfd ; load eflags from stack
pushfd ; save updated eflags to stack pushfd ; save updated eflags to stack
pop eax ; load from stack mov eax,dword ptr [esp] ; load eax from stack
popfd ; pop stack to restore stack pointer
xor edx, edx ; clear edx for defaulting no mmx xor edx, edx ; clear edx for defaulting no mmx
cmp eax, ecx ; compare to original eflags values cmp eax, ecx ; compare to original eflags values
jz end ; jumps to 'end' if cpuid not present jz end ; jumps to 'end' if cpuid not present