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DynamicAPInt: Support APInt constructor. #146301

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Merged
merged 1 commit into from
Jul 1, 2025
Merged

DynamicAPInt: Support APInt constructor. #146301

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9 changes: 9 additions & 0 deletions llvm/include/llvm/ADT/DynamicAPInt.h
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
#ifndef LLVM_ADT_DYNAMICAPINT_H
#define LLVM_ADT_DYNAMICAPINT_H

#include "llvm/ADT/APInt.h"
#include "llvm/ADT/SlowDynamicAPInt.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/MathExtras.h"
Expand Down Expand Up @@ -116,6 +117,14 @@ class DynamicAPInt {
: ValSmall(Val) {
ValLarge.Val.BitWidth = 0;
}
LLVM_ATTRIBUTE_ALWAYS_INLINE explicit DynamicAPInt(const APInt &Val) {
if (Val.getBitWidth() <= 64) {
ValSmall = Val.getSExtValue();
ValLarge.Val.BitWidth = 0;
} else {
new (&ValLarge) detail::SlowDynamicAPInt(Val);
}
}
LLVM_ATTRIBUTE_ALWAYS_INLINE DynamicAPInt() : DynamicAPInt(0) {}
LLVM_ATTRIBUTE_ALWAYS_INLINE ~DynamicAPInt() {
if (LLVM_UNLIKELY(isLarge()))
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10 changes: 10 additions & 0 deletions llvm/unittests/ADT/DynamicAPIntTest.cpp
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Expand Up @@ -31,6 +31,16 @@ class TypeNames {
};
TYPED_TEST_SUITE(IntTest, TypeList, TypeNames);

TYPED_TEST(IntTest, ValueInit) {
APInt Large(65, 0, true);
Large.setBit(64);
TypeParam DynLarge(1ll << 63);
EXPECT_EQ(TypeParam(Large), DynLarge + DynLarge);
APInt Small(64, -1, true);
TypeParam DynSmall(Small.getSExtValue());
EXPECT_EQ(TypeParam(Small), DynSmall);
}

TYPED_TEST(IntTest, ops) {
TypeParam Two(2), Five(5), Seven(7), Ten(10);
EXPECT_EQ(Five + Five, Ten);
Expand Down