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[APInt] Fix getBitsNeeded for INT_MIN values

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Summary: This patch fixes behaviour of APInt::getBitsNeeded for INT_MIN 10 bits values.

Reviewers: regehr, RKSimon

Reviewed By: RKSimon

Subscribers: grandinj, dexonsmith, kristina, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63691

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364710 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dmitry Venikov
2019-06-29 11:38:12 +00:00
parent d6d7595593
commit 78409abb65
2 changed files with 19 additions and 3 deletions
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lib/Support/APInt.cpp
+4 -1
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@@ -482,10 +482,13 @@ unsigned APInt::getBitsNeeded(StringRef str, uint8_t radix) {
APInt tmp(sufficient, StringRef(p, slen), radix);
// Compute how many bits are required. If the log is infinite, assume we need
// just bit.
// just bit. If the log is exact and value is negative, then the value is
// MinSignedValue with (log + 1) bits.
unsigned log = tmp.logBase2();
if (log == (unsigned)-1) {
return isNegative + 1;
} else if (isNegative && tmp.isPowerOf2()) {
return isNegative + log;
} else {
return isNegative + log + 1;
}