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Enable new pass manager on LLVM 13

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The new pass manager is enabled by default in clang since
Clang/LLVM 13. While the discussion about this is still ongoing
(https://lists.llvm.org/pipermail/llvm-dev/2021-August/152305.html)
it's expected that support for the legacy pass manager will be
dropped either in LLVM 14 or 15.

This switches us to use the new pass manager if LLVM >= 13 is used.
This commit is contained in:
Nikita Popov 2021-08-21 22:20:32 +02:00
parent 60fe8b3a65
commit be01f42f73
1 changed files with 3 additions and 2 deletions
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5
compiler/rustc_codegen_llvm/src/back/write.rs
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@ -370,8 +370,9 @@ fn get_pgo_use_path(config: &ModuleConfig) -> Option<CString> {
}
pub(crate) fn should_use_new_llvm_pass_manager(config: &ModuleConfig) -> bool {
// The new pass manager is disabled by default.
config.new_llvm_pass_manager.unwrap_or(false)
// The new pass manager is enabled by default for LLVM >= 13.
// This matches Clang, which also enables it since Clang 13.
config.new_llvm_pass_manager.unwrap_or_else(|| llvm_util::get_version() >= (13, 0, 0))
}
pub(crate) unsafe fn optimize_with_new_llvm_pass_manager(