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NFC: use bit_cast more in AArch64AddressingModes 

llvm-svn: 341749
This commit is contained in:
JF Bastien 2018-09-08 16:43:49 +00:00
parent dc79c7187c
commit 1825d10d3c
1 changed files with 11 additions and 24 deletions
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35
llvm/lib/Target/AArch64/MCTargetDesc/AArch64AddressingModes.h
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@ -754,12 +754,8 @@ static inline uint64_t decodeAdvSIMDModImmType12(uint8_t Imm) {
/// Returns true if Imm is the concatenation of a repeating pattern of type T. /// Returns true if Imm is the concatenation of a repeating pattern of type T.
template <typename T> template <typename T>
static inline bool isSVEMaskOfIdenticalElements(int64_t Imm) { static inline bool isSVEMaskOfIdenticalElements(int64_t Imm) {
union { auto Parts = bit_cast<std::array<T, sizeof(int64_t) / sizeof(T)>>(Imm);
int64_t Whole; return all_of(Parts, [&](T Elem) { return Elem == Parts[0]; });
T Parts[sizeof(int64_t)/sizeof(T)];
} Vec { Imm };
return all_of(Vec.Parts, [Vec](T Elem) { return Elem == Vec.Parts[0]; });
} }
/// Returns true if Imm is valid for CPY/DUP. /// Returns true if Imm is valid for CPY/DUP.
@ -787,29 +783,20 @@ static inline bool isSVEAddSubImm(int64_t Imm) {
/// Return true if Imm is valid for DUPM and has no single CPY/DUP equivalent. /// Return true if Imm is valid for DUPM and has no single CPY/DUP equivalent.
static inline bool isSVEMoveMaskPreferredLogicalImmediate(int64_t Imm) { static inline bool isSVEMoveMaskPreferredLogicalImmediate(int64_t Imm) {
union { if (isSVECpyImm<int64_t>(Imm))
int64_t D;
int32_t S[2];
int16_t H[4];
int8_t B[8];
} Vec = { Imm };
if (isSVECpyImm<int64_t>(Vec.D))
return false; return false;
if (isSVEMaskOfIdenticalElements<int32_t>(Imm) && auto S = bit_cast<std::array<int32_t, 2>>(Imm);
isSVECpyImm<int32_t>(Vec.S[0])) auto H = bit_cast<std::array<int16_t, 4>>(Imm);
return false; auto B = bit_cast<std::array<int8_t, 8>>(Imm);
if (isSVEMaskOfIdenticalElements<int16_t>(Imm) && if (isSVEMaskOfIdenticalElements<int32_t>(Imm) && isSVECpyImm<int32_t>(S[0]))
isSVECpyImm<int16_t>(Vec.H[0]))
return false; return false;
if (isSVEMaskOfIdenticalElements<int16_t>(Imm) && isSVECpyImm<int16_t>(H[0]))
if (isSVEMaskOfIdenticalElements<int8_t>(Imm) &&
isSVECpyImm<int8_t>(Vec.B[0]))
return false; return false;
if (isSVEMaskOfIdenticalElements<int8_t>(Imm) && isSVECpyImm<int8_t>(B[0]))
return isLogicalImmediate(Vec.D, 64); return false;
return isLogicalImmediate(Imm, 64);
} }
inline static bool isAnyMOVZMovAlias(uint64_t Value, int RegWidth) { inline static bool isAnyMOVZMovAlias(uint64_t Value, int RegWidth) {