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Rollup merge of #105583 - luqmana:bitcast-immediates, r=oli-obk

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Operand::extract_field: only cast llval if it's a pointer and replace bitcast w/ pointercast.

Fixes #105439.

Also cc `@erikdesjardins,` looks like another place to cleanup as part of #105545
This commit is contained in:
Yuki Okushi 2023-05-07 14:12:14 +09:00 • committed by GitHub
commit 58597717e2
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2 changed files with 58 additions and 4 deletions
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37
compiler/rustc_codegen_ssa/src/mir/operand.rs
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@ -2,6 +2,7 @@ use super::place::PlaceRef;
use super::{FunctionCx, LocalRef};
use crate::base;
use crate::common::TypeKind;
use crate::glue;
use crate::traits::*;
use crate::MemFlags;
@ -236,19 +237,47 @@ impl<'a, 'tcx, V: CodegenObject> OperandRef<'tcx, V> {
};
match (&mut val, field.abi) {
(OperandValue::Immediate(llval), _) => {
(
OperandValue::Immediate(llval),
Abi::Scalar(_) | Abi::ScalarPair(..) | Abi::Vector { .. },
) => {
// Bools in union fields needs to be truncated.
*llval = bx.to_immediate(*llval, field);
// HACK(eddyb) have to bitcast pointers until LLVM removes pointee types.
*llval = bx.bitcast(*llval, bx.cx().immediate_backend_type(field));
let ty = bx.cx().immediate_backend_type(field);
if bx.type_kind(ty) == TypeKind::Pointer {
*llval = bx.pointercast(*llval, ty);
}
}
(OperandValue::Pair(a, b), Abi::ScalarPair(a_abi, b_abi)) => {
// Bools in union fields needs to be truncated.
*a = bx.to_immediate_scalar(*a, a_abi);
*b = bx.to_immediate_scalar(*b, b_abi);
// HACK(eddyb) have to bitcast pointers until LLVM removes pointee types.
*a = bx.bitcast(*a, bx.cx().scalar_pair_element_backend_type(field, 0, true));
*b = bx.bitcast(*b, bx.cx().scalar_pair_element_backend_type(field, 1, true));
let a_ty = bx.cx().scalar_pair_element_backend_type(field, 0, true);
let b_ty = bx.cx().scalar_pair_element_backend_type(field, 1, true);
if bx.type_kind(a_ty) == TypeKind::Pointer {
*a = bx.pointercast(*a, a_ty);
}
if bx.type_kind(b_ty) == TypeKind::Pointer {
*b = bx.pointercast(*b, b_ty);
}
}
// Newtype vector of array, e.g. #[repr(simd)] struct S([i32; 4]);
(OperandValue::Immediate(llval), Abi::Aggregate { sized: true }) => {
assert!(matches!(self.layout.abi, Abi::Vector { .. }));
let llty = bx.cx().backend_type(self.layout);
let llfield_ty = bx.cx().backend_type(field);
// Can't bitcast an aggregate, so round trip through memory.
let lltemp = bx.alloca(llfield_ty, field.align.abi);
let llptr = bx.pointercast(lltemp, bx.cx().type_ptr_to(llty));
bx.store(*llval, llptr, field.align.abi);
*llval = bx.load(llfield_ty, lltemp, field.align.abi);
}
(OperandValue::Immediate(_), Abi::Uninhabited | Abi::Aggregate { sized: false }) => {
bug!()
}
(OperandValue::Pair(..), _) => bug!(),
(OperandValue::Ref(..), _) => bug!(),