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Merge pull request #899 from devnexen/i386_build_fix

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Preserves EBX manually for the i386 architecture with PIC builds.
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Tomoaki Kawada 2020-06-08 12:54:04 +09:00 committed by GitHub
commit 502e02a2df
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1 changed files with 5 additions and 0 deletions
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5
Sources/Core/CpuID.cpp
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@ -16,6 +16,11 @@ namespace spades {
std::array<uint32_t, 4> regs;
#ifdef WIN32
__cpuid(reinterpret_cast<int *>(regs.data()), a);
#else
#if defined(__i386__) && (defined(__pic__) || defined(__PIC__))
asm volatile("mov %%ebx, %%edi\ncpuid\nxchg %%edi, %%ebx\n"
: "=a"(regs[0]), "=D"(regs[1]), "=c"(regs[2]), "=d"(regs[2])
: "a"(a), "c"(0));
#else
asm volatile("cpuid"
: "=a"(regs[0]), "=b"(regs[1]), "=c"(regs[2]), "=d"(regs[3])