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Auto merge of #117947 - Dirbaio:drop-llvm-15, r=cuviper

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Update the minimum external LLVM to 16.

With this change, we'll have stable support for LLVM 16 and 17.
For reference, the previous increase to LLVM 15 was #114148

[Relevant zulip discussion](https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/riscv.20forced-atomics)
This commit is contained in:
bors 2023-11-27 21:54:03 +00:00
commit 49b3924bd4
65 changed files with 42 additions and 251 deletions
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12
compiler/rustc_codegen_llvm/src/context.rs
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@ -134,18 +134,6 @@ pub unsafe fn create_module<'ll>(
let mut target_data_layout = sess.target.data_layout.to_string();
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-");
}
}
if llvm_version < (17, 0, 0) {
if sess.target.arch.starts_with("powerpc") {
// LLVM 17 specifies function pointer alignment for ppc: