diff options
Diffstat (limited to 'misc/efgcvt_r.c')
| -rw-r--r-- | misc/efgcvt_r.c | 60 |
1 files changed, 22 insertions, 38 deletions
diff --git a/misc/efgcvt_r.c b/misc/efgcvt_r.c index 64dcfcd7e9..1c237eed4a 100644 --- a/misc/efgcvt_r.c +++ b/misc/efgcvt_r.c @@ -136,10 +136,6 @@ APPEND (FUNC_PREFIX, fcvt_r) (value, ndigit, decpt, sign, buf, len) return 0; } -#define weak_extern2(name) weak_extern (name) -weak_extern2 (FLOOR) weak_extern2 (LOG10) weak_extern2 (FABS) -weak_extern2 (EXP) - int APPEND (FUNC_PREFIX, ecvt_r) (value, ndigit, decpt, sign, buf, len) FLOAT_TYPE value; @@ -151,46 +147,34 @@ APPEND (FUNC_PREFIX, ecvt_r) (value, ndigit, decpt, sign, buf, len) if (isfinite (value) && value != 0.0) { - FLOAT_TYPE (*log10_function) (FLOAT_TYPE) = &LOG10; - - if (log10_function) - { - /* Use the reasonable code if -lm is included. */ - FLOAT_TYPE dexponent; - dexponent = FLOOR (LOG10 (FABS (value))); - value *= EXP (dexponent * -M_LN10); - exponent = (int) dexponent; - } + /* Slow code that doesn't require -lm functions. */ + FLOAT_TYPE d; + FLOAT_TYPE f = 1.0; + if (value < 0.0) + d = -value; else + d = value; + if (d < 1.0) { - /* Slow code that doesn't require -lm functions. */ - FLOAT_TYPE d; - if (value < 0.0) - d = -value; - else - d = value; - if (d < 1.0) + do { - do - { - d *= 10.0; - --exponent; - } - while (d < 1.0); + f *= 10.0; + --exponent; } - else if (d >= 10.0) + while (d * f < 1.0); + + value *= f; + } + else if (d >= 10.0) + { + do { - do - { - d *= 0.1; - ++exponent; - } - while (d >= 10.0); + f *= 10; + ++exponent; } - if (value < 0.0) - value = -d; - else - value = d; + while (d >= f * 10.0); + + value /= f; } } else if (value == 0.0) |