[llvm-dev] XMMs unused (original) (raw)
Dangeti Tharun kumar via llvm-dev llvm-dev at lists.llvm.org
Wed Oct 24 21:52:13 PDT 2018
- Previous message: [llvm-dev] [Openmp-dev] OpenMP Target "cannot find libdevice for ."
- Next message: [llvm-dev] XMMs unused
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Hi,
I see that, in Greedy register allocation not all the XMM registers are used(even there is a need) if there is a function call crossing the live range. There are spills which can be avoided just by using them.
The reason I see is the CCC declares XMMs are not callee saved. This means they are caller saved, correct me if I am wrong. Is the greedy RA intentionally not using XMMs in order to avoid saving and restoring regs at call site?
-- Regards, DTharun -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20181025/1700e6c0/attachment.html>
- Previous message: [llvm-dev] [Openmp-dev] OpenMP Target "cannot find libdevice for ."
- Next message: [llvm-dev] XMMs unused
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]