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@ -7,7 +7,7 @@
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file cpu.cpp OS/CPU/compiler dependant CPU specific calls. */
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/** @file cpu.cpp OS/CPU/compiler dependent CPU specific calls. */
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#include "stdafx.h"
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#include "core/bitmath_func.hpp"
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@ -97,12 +97,20 @@ void ottd_cpuid(int info[4], int type)
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void ottd_cpuid(int info[4], int type)
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{
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#if defined(__i386) && defined(__PIC__)
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/* The easy variant would be just cpuid, however... ebx gets clobbered by PIC. */
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/* The easy variant would be just cpuid, however... ebx is being used by the GOT (Global Offset Table)
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* in case of PIC;
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* clobbering ebx is no alternative: some compiler versions don't like this
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* and will issue an error message like
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* "can't find a register in class 'BREG' while reloading 'asm'"
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*/
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__asm__ __volatile__ (
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"xchgl %%ebx, %1 \n\t"
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"cpuid \n\t"
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"xchgl %%ebx, %1 \n\t"
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: "=a" (info[0]), "=r" (info[1]), "=c" (info[2]), "=d" (info[3])
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/* It is safe to write "=r" for (info[1]) as in case that PIC is enabled for i386,
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* the compiler will not choose EBX as target register (but something else).
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*/
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: "a" (type)
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);
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#else
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