diff options
| author | Eike Rathke <erack@redhat.com> | 2020-12-17 22:02:48 +0100 |
|---|---|---|
| committer | Eike Rathke <erack@redhat.com> | 2020-12-18 03:17:03 +0100 |
| commit | a10c33fdbe980effc3a14e773d1b94a14be7d428 (patch) | |
| tree | f8a8302df5b09c6bcfd37838552b22909ef17de8 /sal | |
| parent | cb22636a56b35d4e118446cc3c9fe606db6f46b0 (diff) | |
Replace log2() call with parts.exponent-1023, tdf#138360 follow-up
... to save some cycles as we anyway need only the integer value
of the exponent and even exactly this value for the number of
possible decimals.
Change-Id: I8d462f53cadde6a95d57d1342d8487fbfa001ae9
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/107928
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>
Diffstat (limited to 'sal')
| -rw-r--r-- | sal/rtl/math.cxx | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/sal/rtl/math.cxx b/sal/rtl/math.cxx index 46a3e925b95b..527b508e848c 100644 --- a/sal/rtl/math.cxx +++ b/sal/rtl/math.cxx @@ -1167,9 +1167,10 @@ double SAL_CALL rtl_math_round(double fValue, int nDecPlaces, // Determine how many decimals are representable in the precision. // Anything greater 2^52 and 0.0 was already ruled out above. // Theoretically 0.5, 0.25, 0.125, 0.0625, 0.03125, ... - const double fDec = 52 - log2(fValue) + 1; - if (fDec < nDecPlaces) - nDecPlaces = static_cast<sal_Int32>(fDec); + const sal_math_Double* pd = reinterpret_cast<const sal_math_Double*>(&fValue); + const sal_Int32 nDec = 52 - (pd->parts.exponent - 1023); + if (nDec < nDecPlaces) + nDecPlaces = nDec; } /* TODO: this was without the inverse factor and determining max |