ref: 183610fcad977f4fead56178cf731a2e1c581e65
dir: /cmake/ClipMode.cmake/
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() include(CheckCSourceRuns) include(CMakePushCheckState) cmake_push_check_state(RESET) if(MATH_LIBRARY) list(APPEND CMAKE_REQUIRED_LIBRARIES ${MATH_LIBRARY}) endif() check_c_source_runs( " #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( " #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 CPU_CLIPS_NEGATIVE) set(CLIP_MSG "both") elseif(CPU_CLIPS_POSITIVE) set(CLIP_MSG "positive") elseif(CPU_CLIPS_NEGATIVE) set(CLIP_MSG "negative") else() set(CLIP_MSG "none") endif() endif() message(STATUS "Checking processor clipping capabilities... ${CLIP_MSG}") endmacro()