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Revert r189442 "Change default # of digits for APFloat::toString"

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This is breaking numerous Clang tests on the buildbot.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189447 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ted Kremenek
2013-08-28 06:21:46 +00:00
parent 631bce51b9
commit 9006170945
2 changed files with 8 additions and 12 deletions
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11
lib/Support/APFloat.cpp
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@@ -3546,14 +3546,11 @@ void APFloat::toString(SmallVectorImpl<char> &Str,
// Set FormatPrecision if zero. We want to do this before we
// truncate trailing zeros, as those are part of the precision.
if (!FormatPrecision) {
// We use enough digits so the number can be round-tripped back to an
// APFloat. The formula comes from "How to Print Floating-Point Numbers
// Accurately" by Steele and White.
// FIXME: Using a formula based purely on the precision is conservative;
// we can print fewer digits depending on the actual value being printed.
// It's an interesting question whether to use the nominal
// precision or the active precision here for denormals.
// FormatPrecision = 2 + floor(significandBits / lg_2(10))
FormatPrecision = 2 + semantics->precision * 59 / 196;
// FormatPrecision = ceil(significandBits / lg_2(10))
FormatPrecision = (semantics->precision * 59 + 195) / 196;
}
// Ignore trailing binary zeros.