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Add a -Z flag for LLVM align attributes on arguments #49122

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Mar 24, 2018
Merged

Add a -Z flag for LLVM align attributes on arguments #49122

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2 changes: 2 additions & 0 deletions src/librustc/session/config.rs
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Expand Up @@ -1208,6 +1208,8 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
"set the MIR optimization level (0-3, default: 1)"),
mutable_noalias: bool = (false, parse_bool, [UNTRACKED],
"emit noalias metadata for mutable references"),
arg_align_attributes: bool = (false, parse_bool, [UNTRACKED],
"emit align metadata for reference arguments"),
dump_mir: Option<String> = (None, parse_opt_string, [UNTRACKED],
"dump MIR state at various points in translation"),
dump_mir_dir: String = (String::from("mir_dump"), parse_string, [UNTRACKED],
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2 changes: 1 addition & 1 deletion src/librustc_trans/abi.rs
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Expand Up @@ -778,7 +778,7 @@ impl<'a, 'tcx> FnType<'tcx> {

// HACK(eddyb) LLVM inserts `llvm.assume` calls when inlining functions
// with align attributes, and those calls later block optimizations.
if !is_return {
if !is_return && !cx.tcx.sess.opts.debugging_opts.arg_align_attributes {
attrs.pointee_align = None;
}

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