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Make librustc_codegen_llvm aware of LLVM address spaces. #51576

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Make librustc_codegen_llvm aware of LLVM address spaces. #51576

wants to merge 3 commits into from
+964 −118

Commits on Jan 21, 2019

  1. Make librustc_codegen_llvm aware of LLVM address spaces. 

    In order to not require overloading functions based on their argument's address
space (among other things), we require the presence of a "flat" (ie an address
space which is shared with every other address space) address space.

This isn't exposed in any way to Rust code. This just makes Rust compatible with
LLVM target machines which, for example, place allocas in a different address
space. `amdgcn-amd-amdhsa-amdgiz` is a specific example, which places allocas in
address space 5 or the private (at the work item level) address space.
    @DiamondLovesYou
    DiamondLovesYou committed Jan 21, 2019
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  2. Support Harvard architectures.

    @DiamondLovesYou
    DiamondLovesYou committed Jan 21, 2019
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  3. LLVM value address space optimizations: leave values in their origina… 

    …l address space where possible.
    @DiamondLovesYou
    DiamondLovesYou committed Jan 21, 2019
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