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Rollup merge of #108205 - tshepang:why-special-case, r=cjgillot

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link to llvm changes that prompted the special cases
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Matthias Krüger 2023-02-18 13:26:48 +01:00 committed by GitHub
commit 6c91efd6d7
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compiler/rustc_codegen_llvm/src/context.rs
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@ -145,8 +145,13 @@ pub unsafe fn create_module<'ll>(
let llvm_version = llvm_util::get_version();
if llvm_version < (16, 0, 0) {
if sess.target.arch == "s390x" {
// LLVM 16 data layout changed to always set 64-bit vector alignment,
// which is conditional in earlier LLVM versions.
// https://reviews.llvm.org/D131158 for the discussion.
target_data_layout = target_data_layout.replace("-v128:64", "");
} else if sess.target.arch == "riscv64" {
// LLVM 16 introduced this change so as to produce more efficient code.
// See https://reviews.llvm.org/D116735 for the discussion.
target_data_layout = target_data_layout.replace("-n32:64-", "-n64-");
}
}