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Add llvm.type.checked.load intrinsic

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Add the intrinsic

declare {i8*, i1} @llvm.type.checked.load(i8* %ptr, i32 %offset, metadata %type)

This is used in the VFE optimization when lowering loading functions
from vtables to LLVM IR. The `metadata` is used to map the function to
all vtables this function could belong to. This ensures that functions
from vtables that might be used somewhere won't get removed.
This commit is contained in:
flip1995
2022-04-21 13:58:25 +01:00
committed by Philipp Krones
parent d55787a155
commit e1c1d0f8c2
6 changed files with 88 additions and 18 deletions
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8
compiler/rustc_codegen_llvm/src/context.rs
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@@ -665,6 +665,7 @@ impl<'ll> CodegenCx<'ll, '_> {
let t_isize = self.type_isize();
let t_f32 = self.type_f32();
let t_f64 = self.type_f64();
let t_metadata = self.type_metadata();
ifn!("llvm.wasm.trunc.unsigned.i32.f32", fn(t_f32) -> t_i32);
ifn!("llvm.wasm.trunc.unsigned.i32.f64", fn(t_f64) -> t_i32);
@@ -890,11 +891,12 @@ impl<'ll> CodegenCx<'ll, '_> {
ifn!("llvm.instrprof.increment", fn(i8p, t_i64, t_i32, t_i32) -> void);
}
ifn!("llvm.type.test", fn(i8p, self.type_metadata()) -> i1);
ifn!("llvm.type.test", fn(i8p, t_metadata) -> i1);
ifn!("llvm.type.checked.load", fn(i8p, t_i32, t_metadata) -> mk_struct! {i8p, i1});
if self.sess().opts.debuginfo != DebugInfo::None {
ifn!("llvm.dbg.declare", fn(self.type_metadata(), self.type_metadata()) -> void);
ifn!("llvm.dbg.value", fn(self.type_metadata(), t_i64, self.type_metadata()) -> void);
ifn!("llvm.dbg.declare", fn(t_metadata, t_metadata) -> void);
ifn!("llvm.dbg.value", fn(t_metadata, t_i64, t_metadata) -> void);
}
None
}