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[clang][bytecode] Initialize elements in __builtin_elementwise_popcount #118457

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Merged
merged 1 commit into from
Dec 3, 2024
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[clang][bytecode] Initialize elements in __builtin_elementwise_popcount #118457

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1 change: 1 addition & 0 deletions clang/lib/AST/ByteCode/InterpBuiltin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1791,6 +1791,7 @@ static bool interp__builtin_elementwise_popcount(InterpState &S, CodePtr OpPC,
INT_TYPE_SWITCH_NO_BOOL(ElemT, {
Dst.atIndex(I).deref<T>() =
T::from(Arg.atIndex(I).deref<T>().toAPSInt().popcount());
Dst.atIndex(I).initialize();
});
}

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12 changes: 12 additions & 0 deletions clang/test/AST/ByteCode/builtin-functions.cpp
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Expand Up @@ -7,6 +7,14 @@
// RUN: %clang_cc1 -triple avr -std=c++20 -Wno-string-plus-int -fexperimental-new-constant-interpreter %s -verify=expected,both
// RUN: %clang_cc1 -triple avr -std=c++20 -Wno-string-plus-int -verify=ref,both %s -Wno-constant-evaluated

#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define LITTLE_END 1
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define LITTLE_END 0
#else
#error "huh?"
#endif

extern "C" {
typedef decltype(sizeof(int)) size_t;
extern size_t wcslen(const wchar_t *p);
Expand Down Expand Up @@ -1140,6 +1148,10 @@ namespace ElementwisePopcount {
static_assert(__builtin_elementwise_popcount(0L) == 0);
static_assert(__builtin_elementwise_popcount(0xF0F0L) == 8);
static_assert(__builtin_elementwise_popcount(~0LL) == 8 * sizeof(long long));

#if __INT_WIDTH__ == 32
static_assert(__builtin_bit_cast(unsigned, __builtin_elementwise_popcount((vector4char){1, 2, 3, 4})) == (LITTLE_END ? 0x01020101 : 0x01010201));
#endif
}

namespace BuiltinMemcpy {
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