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Fix an off-by-one error by switching < to <= in -Wtautological-constant-out-of-range-compare and added test case. 

llvm-svn: 168023
This commit is contained in:
Richard Trieu 2012-11-15 03:43:50 +00:00
parent 0f9f019ff8
commit 03c3a2f5bb
2 changed files with 2 additions and 1 deletions
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2
clang/lib/Sema/SemaChecking.cpp
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@ -4385,7 +4385,7 @@ static void DiagnoseOutOfRangeComparison(Sema &S, BinaryOperator *E,
// Check to see if the constant is equivalent to a negative value
// cast to CommonT.
if (S.Context.getIntWidth(ConstantT) == S.Context.getIntWidth(CommonT) &&
Value.isNegative() && Value.getMinSignedBits() < OtherWidth)
Value.isNegative() && Value.getMinSignedBits() <= OtherWidth)
return;
// The constant value rests between values that OtherT can represent after
// conversion. Relational comparison still works, but equality

1
clang/test/SemaCXX/compare.cpp
View File

@ -311,6 +311,7 @@ void test7(unsigned long other) {
(void)((int)other != (unsigned long)(0x00000000ffffffff)); // expected-warning{{true}}
(void)((int)other != (unsigned long)(0x000000000fffffff));
(void)((int)other < (unsigned long)(0x00000000ffffffff)); // expected-warning{{different signs}}
(void)((int)other == (unsigned)(0x800000000));
// Common unsigned, other unsigned, constant signed
(void)((unsigned long)other != (int)(0xffffffff)); // expected-warning{{different signs}}