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The address of the callee may be more than 2 GB away in memory, which cannot be encoded as an immediate offset in the call instruction. So, the value is first materialized with a mov instruction which can encode the immediate and then jumped to through a register. Reid On Tue, Feb 22, 2011 at 12:03 PM, Xin Tong Utoronto <x.tong at utoronto.ca> wrote: > I have a question on the LLVM JIT

I have a question on the LLVM JIT I did some brief memory reading one day and I found that a call to a non-library function is resolved by the X86CompilationCallback, but the X86CompilationCallback is reached through a trampoline. why can not the generated code jump to the X86CompilationCallback function directly ? 0x2b0a6a4d103b: mov $0x2b0a6a561010,%rax 0x2b0a6a4d1045:

...uc.edu http://llvm.cs.uiuc.edu > > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev > > > > > -- Kind Regards Xin Tong -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20110222/d97d7221/attachment.html>