Mark Poliakov
7a0d528cda
git-subtree-dir: lib/runtime git-subtree-mainline: 566a2341f5b726d86f5d42a72beb9c70b83f31b6 git-subtree-split: db5cddbec10c4b7c086eda716d48d4711632901f
30 lines
619 B
C
30 lines
619 B
C
#include <stdint.h>
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#include "private.h"
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static const float huge = 1.0e30F;
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float truncf(float x) {
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int32_t i0,jj0;
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uint32_t i;
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GET_FLOAT_WORD(i0,x);
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jj0 = ((i0>>23)&0xff)-0x7f;
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if(jj0<23) {
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if(jj0<0) { /* raise inexact if x != 0 */
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if(huge+x>0.0F) /* |x|<1, so return 0*sign(x) */
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i0 &= 0x80000000;
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} else {
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i = (0x007fffff)>>jj0;
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if((i0&i)==0) return x; /* x is integral */
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if(huge+x>0.0F) /* raise inexact flag */
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i0 &= (~i);
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}
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} else {
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if(jj0==0x80) return x+x; /* inf or NaN */
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else return x; /* x is integral */
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}
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SET_FLOAT_WORD(x,i0);
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return x;
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}
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