diff options
Diffstat (limited to 'lib/msun/src')
| -rw-r--r-- | lib/msun/src/s_rintf.c | 33 |
1 files changed, 7 insertions, 26 deletions
diff --git a/lib/msun/src/s_rintf.c b/lib/msun/src/s_rintf.c index 591bbe9..429eac7 100644 --- a/lib/msun/src/s_rintf.c +++ b/lib/msun/src/s_rintf.c @@ -17,16 +17,11 @@ static char rcsid[] = "$FreeBSD$"; #endif +#include <sys/types.h> #include "math.h" #include "math_private.h" -/* - * TWO23 is double instead of float to avoid a bug in gcc. Without - * this, gcc thinks that TWO23[sx]+x and w-TWO23[sx] already have float - * precision and doesn't clip them to float precision when they are - * assigned and returned. - */ -static const double +static const float TWO23[2]={ 8.3886080000e+06, /* 0x4b000000 */ -8.3886080000e+06, /* 0xcb000000 */ @@ -36,34 +31,20 @@ float rintf(float x) { int32_t i0,j0,sx; - u_int32_t i,i1; - float w,t; + volatile float w,t; /* volatile works around gcc bug */ GET_FLOAT_WORD(i0,x); sx = (i0>>31)&1; j0 = ((i0>>23)&0xff)-0x7f; if(j0<23) { if(j0<0) { if((i0&0x7fffffff)==0) return x; - i1 = (i0&0x07fffff); - i0 &= 0xfff00000; - i0 |= ((i1|-i1)>>9)&0x400000; - SET_FLOAT_WORD(x,i0); w = TWO23[sx]+x; t = w-TWO23[sx]; - GET_FLOAT_WORD(i0,t); - SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31)); return t; - } else { - i = (0x007fffff)>>j0; - if((i0&i)==0) return x; /* x is integral */ - i>>=1; - if((i0&i)!=0) i0 = (i0&(~i))|((0x100000)>>j0); } - } else { - if(j0==0x80) return x+x; /* inf or NaN */ - else return x; /* x is integral */ + w = TWO23[sx]+x; + return w-TWO23[sx]; } - SET_FLOAT_WORD(x,i0); - w = TWO23[sx]+x; - return w-TWO23[sx]; + if(j0==0x80) return x+x; /* inf or NaN */ + else return x; /* x is integral */ } |
