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