lib/glibc
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Raise invalid exception for NaN result.

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Use __m81_test.
This commit is contained in:
Ulrich Drepper
1997-05-07 15:26:29 +00:00
parent 08c2dbb9a2
commit 4291e75751
1 changed files with 18 additions and 14 deletions
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32
sysdeps/m68k/fpu/e_pow.c
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@@ -36,29 +36,33 @@ s(__ieee754_pow) (float_type x, float_type y)
{ {
float_type z; float_type z;
float_type ax; float_type ax;
unsigned long x_cond, y_cond;
if (y == 0.0) y_cond = __m81_test (y);
if (y_cond & __M81_COND_ZERO)
return 1.0; return 1.0;
if (x != x || y != y)
x_cond = __m81_test (x);
if ((x_cond | y_cond) & __M81_COND_NAN)
return x + y; return x + y;
if (m81(__isinf) (y)) if (y_cond & __M81_COND_INF)
{ {
ax = s(fabs) (x); ax = s(fabs) (x);
if (ax == 1) if (ax == 1)
return 0.0/0.0; return y - y;
if (ax > 1) if (ax > 1)
return y > 0 ? y : 0; return y_cond & __M81_COND_NEG ? 0 : y;
else else
return y < 0 ? -y : 0; return y_cond & __M81_COND_NEG ? -y : 0;
} }
if (s(fabs) (y) == 1) if (s(fabs) (y) == 1)
return y > 0 ? x : 1 / x; return y_cond & __M81_COND_NEG ? 1 / x : x;
if (y == 2) if (y == 2)
return x * x; return x * x;
if (y == 0.5 && x >= 0) if (y == 0.5 && !(x_cond & __M81_COND_NEG))
return m81(__ieee754_sqrt) (x); return m81(__ieee754_sqrt) (x);
if (x == 10.0) if (x == 10.0)
@@ -73,17 +77,17 @@ s(__ieee754_pow) (float_type x, float_type y)
} }
ax = s(fabs) (x); ax = s(fabs) (x);
if (m81(__isinf) (x) || x == 0 || ax == 1) if (x_cond & (__M81_COND_INF | __M81_COND_ZERO) || ax == 1)
{ {
z = ax; z = ax;
if (y < 0) if (y_cond & __M81_COND_NEG)
z = 1 / z; z = 1 / z;
if (m81(__signbit) (x)) if (x_cond & __M81_COND_NEG)
{ {
if (y != m81(__rint) (y)) if (y != m81(__rint) (y))
{ {
if (x == -1) if (x == -1)
z = 0.0/0.0; z = (z - z) / (z - z);
} }
else else
goto maybe_negate; goto maybe_negate;
@@ -91,7 +95,7 @@ s(__ieee754_pow) (float_type x, float_type y)
return z; return z;
} }
if (x < 0.0) if (x_cond & __M81_COND_NEG)
{ {
if (y == m81(__rint) (y)) if (y == m81(__rint) (y))
{ {
@@ -112,7 +116,7 @@ s(__ieee754_pow) (float_type x, float_type y)
} }
} }
else else
z = 0.0/0.0; z = (y - y) / (y - y);
} }
else else
z = m81(__ieee754_exp) (y * m81(__ieee754_log) (x)); z = m81(__ieee754_exp) (y * m81(__ieee754_log) (x));