ref: ed072224bf5ca317f6e23d6d9e8376a07d70b228
dir: /cmake/ClipMode.cmake/
include (CheckCSourceRuns) include (CMakePushCheckState) macro (CLIP_MODE) set (CLIP_MODE_POSITIVE_MESSAGE "Target processor clips on positive float to int conversion") set (CLIP_MODE_NEGATIVE_MESSAGE "Target processor clips on negative float to int conversion") message (STATUS "Checking processor clipping capabilities...") if (CMAKE_CROSSCOMPILING) set (CLIP_MSG "disabled") set (CPU_CLIPS_POSITIVE FALSE CACHE BOOL ${CLIP_MODE_POSITIVE_MESSAGE}) set (CPU_CLIPS_NEGATIVE FALSE CACHE BOOL ${CLIP_MODE_NEGATIVE_MESSAGE}) else (NOT CMAKE_CROSSCOMPILING) cmake_push_check_state () set (CMAKE_REQUIRED_QUIET TRUE) if (LIBM_REQUIRED) set (CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} ${M_LIBRARY}) endif () check_c_source_runs ( " #define _ISOC9X_SOURCE 1 #define _ISOC99_SOURCE 1 #define __USE_ISOC99 1 #define __USE_ISOC9X 1 #include <math.h> int main (void) { double fval ; int k, ival ; fval = 1.0 * 0x7FFFFFFF ; for (k = 0 ; k < 100 ; k++) { ival = (lrint (fval)) >> 24 ; if (ival != 127) return 1 ; fval *= 1.2499999 ; } ; return 0 ; } " CPU_CLIPS_POSITIVE) check_c_source_runs ( " #define _ISOC9X_SOURCE 1 #define _ISOC99_SOURCE 1 #define __USE_ISOC99 1 #define __USE_ISOC9X 1 #include <math.h> int main (void) { double fval ; int k, ival ; fval = -8.0 * 0x10000000 ; for (k = 0 ; k < 100 ; k++) { ival = (lrint (fval)) >> 24 ; if (ival != -128) return 1 ; fval *= 1.2499999 ; } ; return 0 ; } " CPU_CLIPS_NEGATIVE) cmake_pop_check_state () if (CPU_CLIPS_POSITIVE AND (NOT CPU_CLIPS_NEGATIVE)) set (CLIP_MSG "positive") elseif (CPU_CLIPS_NEGATIVE AND (NOT CPU_CLIPS_POSITIVE)) set (CLIP_MSG "negative") elseif (CPU_CLIPS_POSITIVE AND CPU_CLIPS_NEGATIVE) set (CLIP_MSG "both") else () set (CLIP_MSG "none") endif () endif (CMAKE_CROSSCOMPILING) message (STATUS "Checking processor clipping capabilities... ${CLIP_MSG}") endmacro (CLIP_MODE)