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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2020-02-15 12:16:14 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2020-02-15 12:16:14 +0000 |
| commit | 34ad4cca7245626c3d8348c7e3dd077ff35db84e (patch) | |
| tree | cc70a6423c4239fe1238d60ed67e011041038d08 /llvm/lib/Support/APInt.cpp | |
| parent | 4d5c3ade0b26ae3189e4601ce539844f54722ed8 (diff) | |
| download | llvm-34ad4cca7245626c3d8348c7e3dd077ff35db84e.zip llvm-34ad4cca7245626c3d8348c7e3dd077ff35db84e.tar.gz llvm-34ad4cca7245626c3d8348c7e3dd077ff35db84e.tar.bz2 | |
[APInt] byteSwap - simplify sub 64-bits cases to match general implementation. NFCI.
We can just byteSwap the entire uint64_t VAL and then shift down into place like we do for the multi-word case.
Diffstat (limited to 'llvm/lib/Support/APInt.cpp')
| -rw-r--r-- | llvm/lib/Support/APInt.cpp | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/llvm/lib/Support/APInt.cpp b/llvm/lib/Support/APInt.cpp index c07fc6d..3a5fada 100644 --- a/llvm/lib/Support/APInt.cpp +++ b/llvm/lib/Support/APInt.cpp @@ -675,15 +675,11 @@ APInt APInt::byteSwap() const { return APInt(BitWidth, ByteSwap_16(uint16_t(U.VAL))); if (BitWidth == 32) return APInt(BitWidth, ByteSwap_32(unsigned(U.VAL))); - if (BitWidth == 48) { - unsigned Tmp1 = unsigned(U.VAL >> 16); - Tmp1 = ByteSwap_32(Tmp1); - uint16_t Tmp2 = uint16_t(U.VAL); - Tmp2 = ByteSwap_16(Tmp2); - return APInt(BitWidth, (uint64_t(Tmp2) << 32) | Tmp1); - } - if (BitWidth == 64) - return APInt(BitWidth, ByteSwap_64(U.VAL)); + if (BitWidth <= 64) { + uint64_t Tmp1 = ByteSwap_64(U.VAL); + Tmp1 >>= (64 - BitWidth); + return APInt(BitWidth, Tmp1); + } APInt Result(getNumWords() * APINT_BITS_PER_WORD, 0); for (unsigned I = 0, N = getNumWords(); I != N; ++I) |