[Bug 75276] Implement VGPR Register Spilling

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75276

--- Comment #51 from John <john.ettedgui at gmail.com> ---
Not sure if it is exactly related to this bug, but I can't play
NeverWinterNight, I get a lot of blocs like these:

LLVM triggered Diagnostic Handler: SIInstrInfo::storeRegToStackSlot - Do not
know how to spill register
LLVM triggered Diagnostic Handler: SIInstrInfo::loadRegFromStackSlot - Do not
know how to restore register
LLVM triggered Diagnostic Handler: Ran out of VGPRs for spilling SGPR
then:
radeon_llvm_compile: Processing Diag Flag
LLVM failed to compile shader
EE si_state.c:2282 si_shader_select - Failed to build shader variant (type=1) 1
and then back to above

I'm on git for llvm, clang, mesa (radeonsi).
Using Linux 3.17.2, x64 if that matters.

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