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"I got annoyed at the compiler warnings from ConstantInt::get(Ty, -1,

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true), and casts make me nervous and are verbose anyway, so here's a
ConstantInt::getSigned(Ty, int64_t) method. Just overloading
ConstantInt::get() to take an int64_t too would cause ambiguous
overload errors."

Patch by Jeffrey Yasskin!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69958 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-04-24 05:30:14 +00:00
parent b706d29f9c
commit f3b0aac190
2 changed files with 23 additions and 0 deletions
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9
include/llvm/Constants.h
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@ -110,6 +110,15 @@ public:
/// @brief Get a ConstantInt for a specific value.
static ConstantInt *get(const Type *Ty, uint64_t V, bool isSigned = false);
/// Return a ConstantInt with the specified value for the specified type. The
/// value V will be canonicalized to a an unsigned APInt. Accessing it with
/// either getSExtValue() or getZExtValue() will yield a correctly sized and
/// signed value for the type Ty.
/// @brief Get a ConstantInt for a specific signed value.
static ConstantInt *getSigned(const Type *Ty, int64_t V) {
return get(Ty, V, true);
}
/// Return a ConstantInt with the specified value and an implied Type. The
/// type is the integer type that corresponds to the bit width of the value.
static ConstantInt *get(const APInt &V);

14
unittests/VMCore/ConstantsTest.cpp
View File

@ -19,6 +19,7 @@ TEST(ConstantsTest, Integer_i1) {
Constant* One = ConstantInt::get(Int1, 1, true);
Constant* Zero = ConstantInt::get(Int1, 0);
Constant* NegOne = ConstantInt::get(Int1, static_cast<uint64_t>(-1), true);
EXPECT_EQ(NegOne, ConstantInt::getSigned(Int1, -1));
Constant* Undef = UndefValue::get(Int1);
// Input: @b = constant i1 add(i1 1 , i1 1)
@ -94,5 +95,18 @@ TEST(ConstantsTest, Integer_i1) {
EXPECT_EQ(Zero, ConstantExpr::getSRem(One, NegOne));
}
TEST(ConstantsTest, IntSigns) {
const IntegerType* Int8Ty = Type::Int8Ty;
EXPECT_EQ(100, ConstantInt::get(Int8Ty, 100, false)->getSExtValue());
EXPECT_EQ(100, ConstantInt::get(Int8Ty, 100, true)->getSExtValue());
EXPECT_EQ(100, ConstantInt::getSigned(Int8Ty, 100)->getSExtValue());
EXPECT_EQ(-50, ConstantInt::get(Int8Ty, 206)->getSExtValue());
EXPECT_EQ(-50, ConstantInt::getSigned(Int8Ty, -50)->getSExtValue());
EXPECT_EQ(206U, ConstantInt::getSigned(Int8Ty, -50)->getZExtValue());
// Overflow is handled by truncation.
EXPECT_EQ(0x3b, ConstantInt::get(Int8Ty, 0x13b)->getSExtValue());
}
} // end anonymous namespace
} // end namespace llvm