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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()
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