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Make cpuid not use %%esi -> dangerous if someone is using it.

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Gael Guennebaud 2013-03-19 14:11:59 +01:00
parent 0d5a418048
commit f29b4c435b
1 changed files with 3 additions and 2 deletions
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5
Eigen/src/Core/util/Memory.h
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@ -751,9 +751,10 @@ public:
# if defined(__PIC__) && defined(__i386__)
// Case for x86 with PIC
# define EIGEN_CPUID(abcd,func,id) \
__asm__ __volatile__ ("xchgl %%ebx, %%esi;cpuid; xchgl %%ebx,%%esi": "=a" (abcd[0]), "=S" (abcd[1]), "=c" (abcd[2]), "=d" (abcd[3]) : "a" (func), "c" (id));
__asm__ __volatile__ ("xchgl %%ebx, %k1;cpuid; xchgl %%ebx,%k1": "=a" (abcd[0]), "=&r" (abcd[1]), "=c" (abcd[2]), "=d" (abcd[3]) : "a" (func), "c" (id));
# elif defined(__PIC__) && defined(__x86_64__)
// Case for x64 with PIC
// Case for x64 with PIC. In theory this is only a problem with recent gcc and with medium or large code model, not with the default small code model.
// However, we cannot detect which code model is used, and the xchg overhead is negligible anyway.
# define EIGEN_CPUID(abcd,func,id) \
__asm__ __volatile__ ("xchg{q}\t{%%}rbx, %q1; cpuid; xchg{q}\t{%%}rbx, %q1": "=a" (abcd[0]), "=&r" (abcd[1]), "=c" (abcd[2]), "=d" (abcd[3]) : "0" (func), "2" (id));
# else