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Teach llvm backend how to fall back to default bodies

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This commit is contained in:
Oli Scherer 2024-01-31 20:39:59 +00:00
parent 432635a9ea
commit 9a0743747f
11 changed files with 109 additions and 103 deletions
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23
compiler/rustc_codegen_llvm/src/intrinsic.rs
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@ -86,7 +86,7 @@ impl<'ll, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'_, 'll, 'tcx> {
args: &[OperandRef<'tcx, &'ll Value>],
llresult: &'ll Value,
span: Span,
) {
) -> Result<(), ty::Instance<'tcx>> {
let tcx = self.tcx;
let callee_ty = instance.ty(tcx, ty::ParamEnv::reveal_all());
@ -141,7 +141,7 @@ impl<'ll, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'_, 'll, 'tcx> {
args[2].immediate(),
llresult,
);
return;
return Ok(());
}
sym::breakpoint => self.call_intrinsic("llvm.debugtrap", &[]),
sym::va_copy => {
@ -194,17 +194,17 @@ impl<'ll, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'_, 'll, 'tcx> {
if !result.layout.is_zst() {
self.store(load, result.llval, result.align);
}
return;
return Ok(());
}
sym::volatile_store => {
let dst = args[0].deref(self.cx());
args[1].val.volatile_store(self, dst);
return;
return Ok(());
}
sym::unaligned_volatile_store => {
let dst = args[0].deref(self.cx());
args[1].val.unaligned_volatile_store(self, dst);
return;
return Ok(());
}
sym::prefetch_read_data
| sym::prefetch_write_data
@ -305,7 +305,7 @@ impl<'ll, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'_, 'll, 'tcx> {
name,
ty,
});
return;
return Ok(());
}
}
}
@ -387,7 +387,7 @@ impl<'ll, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'_, 'll, 'tcx> {
.unwrap_or_else(|| bug!("failed to generate inline asm call for `black_box`"));
// We have copied the value to `result` already.
return;
return Ok(());
}
_ if name.as_str().starts_with("simd_") => {
@ -395,11 +395,15 @@ impl<'ll, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'_, 'll, 'tcx> {
self, name, callee_ty, fn_args, args, ret_ty, llret_ty, span,
) {
Ok(llval) => llval,
Err(()) => return,
Err(()) => return Ok(()),
}
}
_ => bug!("unknown intrinsic '{}' -- should it have been lowered earlier?", name),
_ => {
debug!("unknown intrinsic '{}' -- falling back to default body", name);
// Call the fallback body instead of generating the intrinsic code
return Err(ty::Instance::new(instance.def_id(), instance.args));
}
};
if !fn_abi.ret.is_ignore() {
@ -411,6 +415,7 @@ impl<'ll, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'_, 'll, 'tcx> {
.store(self, result);
}
}
Ok(())
}
fn abort(&mut self) {