diff options
Diffstat (limited to 'interp/interpreter.go')
| -rw-r--r-- | interp/interpreter.go | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/interp/interpreter.go b/interp/interpreter.go index 1ec4597e1..c48b9b5fe 100644 --- a/interp/interpreter.go +++ b/interp/interpreter.go @@ -746,6 +746,14 @@ func (r *runner) run(fn *function, params []value, parentMem *memoryView, indent // src/strings/builder.go in the Go source tree. This is // the identity operator, so we can return the input. locals[inst.localIndex] = lhs + } else if inst.opcode == llvm.And && rhs.Uint() < 8 { + // This is probably part of a pattern to get the lower bits + // of a pointer for pointer tagging, like this: + // uintptr(unsafe.Pointer(t)) & 0b11 + // We can actually support this easily by ANDing with the + // pointer offset. + result := uint64(lhsPtr.offset()) & rhs.Uint() + locals[inst.localIndex] = makeLiteralInt(result, int(lhs.len(r)*8)) } else { // Catch-all for weird operations that should just be done // at runtime. |