[LLVMdev] Global register variables/custom calling conventions

Andrew Jeffery andrew at aj.id.au
Sat Sep 19 18:47:40 PDT 2009

Hi all,

I'm implementing an LLVM backend for qemu-arm (by creating an ARM 
frontend for LLVM - from what I understand a slightly different approach 
than the original llvm-qemu project) and I've got to the point where I 
have to deal with Qemu's use of global register variables. From what 
I've read LLVM doesn't support GCC style register variables and the 
workaround was to implement a custom calling convention to ensure they 
weren't clobbered (at least from a caller's point of view)[1]. I haven't 
played with the LLVM code base much, just used the interfaces, and so 
was wondering if anyone had some pointers on what to look at/how to go 
about this?




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