diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/cpu.cpp | 14 | ||||
| -rw-r--r-- | src/cpu.h | 9 | ||||
| -rw-r--r-- | src/viewport_sprite_sorter_sse4.cpp | 8 |
3 files changed, 23 insertions, 8 deletions
diff --git a/src/cpu.cpp b/src/cpu.cpp index efa070bcb..45b7faab4 100644 --- a/src/cpu.cpp +++ b/src/cpu.cpp @@ -7,9 +7,10 @@ * 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/>. */ -/** @file cpu.cpp OS/CPU/compiler dependant real time tick sampling. */ +/** @file cpu.cpp OS/CPU/compiler dependant CPU specific calls. */ #include "stdafx.h" +#include "core/bitmath_func.hpp" #undef RDTSC_AVAILABLE @@ -107,3 +108,14 @@ void ottd_cpuid(int info[4], int type) info[0] = info[1] = info[2] = info[3] = 0; } #endif + +bool HasCPUIDFlag(uint type, uint index, uint bit) +{ + int cpu_info[4] = {-1}; + ottd_cpuid(cpu_info, 0); + uint max_info_type = cpu_info[0]; + if (max_info_type < type) return false; + + ottd_cpuid(cpu_info, type); + return HasBit(cpu_info[index], bit); +} @@ -25,4 +25,13 @@ uint64 ottd_rdtsc(); */ void ottd_cpuid(int info[4], int type); +/** + * Check whether the current CPU has the given flag. + * @param type The type to be passing to cpuid (usually 1). + * @param index The index in the returned info array. + * @param bit The bit index that needs to be set. + * @return The value of the bit, or false when there is no CPUID or the type is not available. + */ +bool HasCPUIDFlag(uint type, uint index, uint bit); + #endif /* CPU_H */ diff --git a/src/viewport_sprite_sorter_sse4.cpp b/src/viewport_sprite_sorter_sse4.cpp index 40bbca87d..7cd48e7d9 100644 --- a/src/viewport_sprite_sorter_sse4.cpp +++ b/src/viewport_sprite_sorter_sse4.cpp @@ -97,13 +97,7 @@ void ViewportSortParentSpritesSSE41(ParentSpriteToSortVector *psdv) */ bool ViewportSortParentSpritesSSE41Checker() { - int cpu_info[4] = {-1}; - ottd_cpuid(cpu_info, 0); - unsigned int max_info_type = cpu_info[0]; - if (max_info_type < 1) return false; - - ottd_cpuid(cpu_info, 1); - return (cpu_info[2] & (1 << 19)) != 0; + return HasCPUIDFlag(1, 2, 19); } #endif /* WITH_SSE */ |