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newlib/libm/common: Don't re-convert float to bits in modf/modff 

These functions shared a pattern of re-converting the argument to bits
when returning +/-0. Skip that as the initial conversion still has the
sign bit.

Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Keith Packard via Newlib 2020-03-25 17:18:20 -07:00 committed by Corinna Vinschen
parent 61cd34c1bf
commit 3439f3b0e9
2 changed files with 5 additions and 15 deletions
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12
newlib/libm/common/s_modf.c
View File

@ -81,10 +81,8 @@ QUICKREF
} else {
i = (0x000fffff)>>j0;
if(((i0&i)|i1)==0) { /* x is integral */
__uint32_t high;
*iptr = x;
GET_HIGH_WORD(high,x);
INSERT_WORDS(x,high&0x80000000,0); /* return +-0 */
INSERT_WORDS(x,i0&0x80000000,0); /* return +-0 */
return x;
} else {
INSERT_WORDS(*iptr,i0&(~i),0);
@ -92,19 +90,15 @@ QUICKREF
}
}
} else if (j0>51) { /* no fraction part */
__uint32_t high;
*iptr = x;
if (__fpclassifyd(x) == FP_NAN) return *iptr = x+x; /* x is NaN, return NaN */
GET_HIGH_WORD(high,x);
INSERT_WORDS(x,high&0x80000000,0); /* return +-0 */
INSERT_WORDS(x,i0&0x80000000,0); /* return +-0 */
return x;
} else { /* fraction part in low x */
i = ((__uint32_t)(0xffffffff))>>(j0-20);
if((i1&i)==0) { /* x is integral */
__uint32_t high;
*iptr = x;
GET_HIGH_WORD(high,x);
INSERT_WORDS(x,high&0x80000000,0); /* return +-0 */
INSERT_WORDS(x,i0&0x80000000,0); /* return +-0 */
return x;
} else {
INSERT_WORDS(*iptr,i0,i1&(~i));

8
newlib/libm/common/sf_modf.c
View File

@ -33,10 +33,8 @@
} else {
i = (0x007fffff)>>j0;
if((i0&i)==0) { /* x is integral */
__uint32_t ix;
*iptr = x;
GET_FLOAT_WORD(ix,x);
SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */
SET_FLOAT_WORD(x,i0&0x80000000); /* return +-0 */
return x;
} else {
SET_FLOAT_WORD(*iptr,i0&(~i));
@ -44,11 +42,9 @@
}
}
} else { /* no fraction part */
__uint32_t ix;
*iptr = x;
if (__fpclassifyf(x) == FP_NAN) return *iptr = x+x; /* x is NaN, return NaN */
GET_FLOAT_WORD(ix,x);
SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */
SET_FLOAT_WORD(x,i0&0x80000000); /* return +-0 */
return x;
}
}