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Auto merge of #83044 - kubo39:set-llvm-code-model, r=nikic

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Add support for storing code model to LLVM module IR

This patch avoids undefined behavior by linking different object files.
Also this would it could be propagated properly to LTO.

See https://reviews.llvm.org/D52322 and https://reviews.llvm.org/D52323.

This patch is based on https://github.com/rust-lang/rust/pull/74002
This commit is contained in:
bors 2021-03-14 11:46:57 +00:00
commit 84c08f82b4
5 changed files with 38 additions and 1 deletions
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20
src/test/codegen/codemodels.rs Normal file
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// only-x86_64
// revisions: NOMODEL MODEL-SMALL MODEL-KERNEL MODEL-MEDIUM MODEL-LARGE
//[NOMODEL] compile-flags:
//[MODEL-SMALL] compile-flags: -C code-model=small
//[MODEL-KERNEL] compile-flags: -C code-model=kernel
//[MODEL-MEDIUM] compile-flags: -C code-model=medium
//[MODEL-LARGE] compile-flags: -C code-model=large
#![crate_type = "lib"]
// MODEL-SMALL: !llvm.module.flags = !{{{.*}}}
// MODEL-SMALL: !{{[0-9]+}} = !{i32 1, !"Code Model", i32 1}
// MODEL-KERNEL: !llvm.module.flags = !{{{.*}}}
// MODEL-KERNEL: !{{[0-9]+}} = !{i32 1, !"Code Model", i32 2}
// MODEL-MEDIUM: !llvm.module.flags = !{{{.*}}}
// MODEL-MEDIUM: !{{[0-9]+}} = !{i32 1, !"Code Model", i32 3}
// MODEL-LARGE: !llvm.module.flags = !{{{.*}}}
// MODEL-LARGE: !{{[0-9]+}} = !{i32 1, !"Code Model", i32 4}
// NOMODEL-NOT: Code Model