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Upstream: https://github.com/llvm/llvm-project/issues/94726
diff --git a/lib/Target/M68k/MCTargetDesc/M68kBaseInfo.h b/lib/Target/M68k/MCTargetDesc/M68kBaseInfo.h
index 1376b06bef6f..62ea03cc9760 100644
--- a/lib/Target/M68k/MCTargetDesc/M68kBaseInfo.h
+++ b/lib/Target/M68k/MCTargetDesc/M68kBaseInfo.h
@@ -85,9 +85,16 @@ template <typename value_t> value_t swapWord(value_t Val) {
Val = support::endian::byte_swap(Val, llvm::endianness::big);
value_t NewVal = 0;
for (unsigned i = 0U; i != NumWords; ++i) {
- uint16_t Part = (Val >> (i * 16)) & 0xFFFF;
- Part = support::endian::byte_swap(Part, llvm::endianness::big);
- NewVal |= (Part << (i * 16));
+ if (llvm::endianness::native == llvm::endianness::big) {
+ uint16_t Lo = (Val >> (i * 16)) & 0xFFFF;
+ NewVal |= (Lo << (++i * 16));
+ uint16_t Hi = (Val >> (++i * 16)) & 0xFFFF;
+ NewVal |= (Hi << ((i - 1) * 16));
+ } else {
+ uint16_t Part = (Val >> (i * 16)) & 0xFFFF;
+ Part = support::endian::byte_swap(Part, llvm::endianness::big);
+ NewVal |= (Part << (i * 16));
+ }
}
return NewVal;
}
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