一番早いminはどれ? typedef int int32_t; int32_t min0( int32_t a, int32_t b ) { return a < b ? a : b; } int32_t min1( int32_t a, int32_t b ) { return ( ( a < b ) * a ) | ( ( b <= a ) * b ); } int32_t min2( int32_t a, int32_t b ) { // mathmatic shift return ( ( ( a - b ) >> 31 ) & a ) | ( ( ( b - a - 1 ) >> 31 ) & b ); } int32_t min3( int32_t a, int32_t b ) { // logical shift return ( ( ( a - b ) >> 31 ) * a ) | ( ( ( b - a - 1 ) >> 31 ) * b ); } int32_t min4( int32_t a, int32_t b ) { return ( ( ( ( a - b ) >> 31 ) & 0x01 ) * a ) | ( ( ( ( b - a - 1 ) >> 31 ) & 0x01 ) * b ); }