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Replace aho/ali usage with HP

This commit is contained in:
Eugen Wissner 2017-11-16 19:28:44 +01:00
parent a38242d0ac
commit 10022d158c
1 changed files with 18 additions and 14 deletions
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32
source/tanya/format/package.d
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@ -125,20 +125,24 @@ private struct HP
private void multiply(ref const HP x, ref const HP y)
@nogc nothrow pure @safe
{
double ahi, bhi;
HP a, b;
long bt;
this.base = x.base * y.base;
copyFp(x.base, bt);
bt &= (~cast(ulong) 0) << 27;
copyFp(bt, ahi);
bt &= ulong.max << 27;
copyFp(bt, a.base);
double alo = x.base - ahi;
a.offset = x.base - a.base;
copyFp(y.base, bt);
bt &= (~cast(ulong) 0) << 27;
copyFp(bt, bhi);
bt &= ulong.max << 27;
copyFp(bt, b.base);
double blo = y.base - bhi;
this.offset = ahi * bhi - this.base + ahi * blo + alo * bhi + alo * blo;
b.offset = y.base - b.base;
this.offset = a.base * b.base - this.base
+ a.base * b.offset
+ a.offset * b.base
+ a.offset * b.offset;
this.offset += x.base * y.offset + x.offset * y.base;
}
}
@ -321,8 +325,8 @@ private HP raise2Power10(const HP value, int power)
/*
* Given a float value, returns the significant bits in bits, and the position
* of the decimal point in $(D_PARAM decimalPos). +/-Inf and NaN are specified
* by special values returned in the $(D_PARAM decimalPos). Sing bit is set in
* of the decimal point in $(D_PARAM exponent). +/-Inf and NaN are specified
* by special values returned in the $(D_PARAM exponent). Sing bit is set in
* $(D_PARAM sign).
*/
private const(char)[] real2String(double value,
@ -383,10 +387,10 @@ private const(char)[] real2String(double value,
// Get full as much precision from double-double as possible.
bits = cast(long) p.base;
double vh = cast(double) bits;
double ahi = p.base - vh;
double t = ahi - p.base;
double alo = p.base - ahi + t - vh - t;
bits += cast(long) (ahi + alo + p.offset);
auto a = HP(p.base - vh);
double t = a.base - p.base;
a.offset = p.base - a.base + t - vh - t;
bits += cast(long) (a.base + a.offset + p.offset);
// Check if we undershot (bits >= 10 ^ 19).
if ((cast(ulong) bits) >= 1000000000000000000UL)