50 lines
959 B
C
50 lines
959 B
C
#include <stdio.h>
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#include <stdint.h>
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#include <math.h>
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typedef uint32_t uint32;
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typedef uint32 angle_t;
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int main(int argc, char **argv)
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{
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int64_t i64 = 1000000000000;
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double d = i64;
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printf("%lli => %f\n", i64, d);
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i64 = -i64;
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d = i64;
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printf("%lli => %f\n", i64, d);
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d = M_PI/4.0;
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d = d*(1<<30)/M_PI;
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angle_t u32 = (angle_t)d;
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printf("(angle_t)%f = %u == 0x%08X\n", d, u32, u32);
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int16_t a=0, b=0;
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#ifdef __ANDROID__
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asm volatile (
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"fldpi \n"
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"fisttpl %0 \n"
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: "=m" (a));
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asm volatile (
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"fldpi \n"
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"fchs \n"
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"fistpl %0 \n"
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: "=m" (b));
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#else
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asm volatile (
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"fldpi \n"
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"fisttp %0 \n"
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: "=m" (a));
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asm volatile (
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"fldpi \n"
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"fchs \n"
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"fistp %0 \n"
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: "=m" (b));
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#endif
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printf("go PI trucated=%d, -PI rounded=%d\n", a, b);
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return 0;
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}
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