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Fix APInt::operator*= so that it computes the correct result for large integers where there is unsigned overflow. Fix APFloat::toString so that it doesn't depend on the incorrect behavior in common cases (and computes the correct result in some rare cases). Fixes PR11086.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141441 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-10-07 23:40:49 +00:00
parent d2fdb4a285
commit 9eb6b4d91b
3 changed files with 12 additions and 2 deletions
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2
lib/Support/APFloat.cpp
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@ -3455,7 +3455,7 @@ void APFloat::toString(SmallVectorImpl<char> &Str,
// <= semantics->precision + e * 137 / 59
// (log_2(5) ~ 2.321928 < 2.322034 ~ 137/59)
unsigned precision = semantics->precision + 137 * texp / 59;
unsigned precision = semantics->precision + (137 * texp + 136) / 59;
// Multiply significand by 5^e.
// N * 5^0101 == N * 5^(1*1) * 5^(0*2) * 5^(1*4) * 5^(0*8)