Alignment checking for IA32. It catches unexpected alignment errors and generates an exception. It's helpful for finding memory errors and especially for debugging read barriers in a poisoned heap.
To use, build with -Dconfig.alignment-checking=true. You also need to build with -Dtarget.arch.sse2=none (since the
disassembler doesn't support SSE2) and run Jikes with -Xrocessors=1 (since the alignment checking approach doesn't support
Alignment checking slows execution since each expected alignment error invokes the trap handler, which ignores the exception. So occasionally a pre-commit test will timeout (only when Jikes is built with alignment checking of course), so the timeouts may need to be increased to do regression tests with alignment checking on.