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Fix pow and powf undefined behavior in libm.

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This commit is contained in:
Jonas 'Sortie' Termansen 2016-01-05 20:40:07 +01:00
parent a43c89650f
commit 0eeb9d1e56
2 changed files with 2 additions and 2 deletions
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2
libm/src/e_pow.c
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@ -296,7 +296,7 @@ __ieee754_pow(double x, double y)
r = (z*t1)/(t1-two)-(w+z*w); r = (z*t1)/(t1-two)-(w+z*w);
z = one-(r-z); z = one-(r-z);
GET_HIGH_WORD(j,z); GET_HIGH_WORD(j,z);
j += (n<<20); j = (int32_t)((uint32_t)j + ((uint32_t)u<<20));
if((j>>20)<=0) z = scalbn(z,n); /* subnormal output */ if((j>>20)<=0) z = scalbn(z,n); /* subnormal output */
else SET_HIGH_WORD(z,j); else SET_HIGH_WORD(z,j);
return s*z; return s*z;

2
libm/src/e_powf.c
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@ -240,7 +240,7 @@ __ieee754_powf(float x, float y)
r = (z*t1)/(t1-two)-(w+z*w); r = (z*t1)/(t1-two)-(w+z*w);
z = one-(r-z); z = one-(r-z);
GET_FLOAT_WORD(j,z); GET_FLOAT_WORD(j,z);
j += (n<<23); j = (int32_t)((uint32_t)j + ((uint32_t)u<<23));
if((j>>23)<=0) z = scalbnf(z,n); /* subnormal output */ if((j>>23)<=0) z = scalbnf(z,n); /* subnormal output */
else SET_FLOAT_WORD(z,j); else SET_FLOAT_WORD(z,j);
return s*z; return s*z;