[llvm] 34ad4cc - [APInt] byteSwap - simplify sub 64-bits cases to match general implementation. NFCI.
Simon Pilgrim via llvm-commits
llvm-commits at lists.llvm.org
Sat Feb 15 04:16:38 PST 2020
Author: Simon Pilgrim
Date: 2020-02-15T12:16:14Z
New Revision: 34ad4cca7245626c3d8348c7e3dd077ff35db84e
URL: https://github.com/llvm/llvm-project/commit/34ad4cca7245626c3d8348c7e3dd077ff35db84e
DIFF: https://github.com/llvm/llvm-project/commit/34ad4cca7245626c3d8348c7e3dd077ff35db84e.diff
LOG: [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.
Added:
Modified:
llvm/lib/Support/APInt.cpp
Removed:
################################################################################
diff --git a/llvm/lib/Support/APInt.cpp b/llvm/lib/Support/APInt.cpp
index c07fc6d2279b..3a5fada6cf66 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)
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