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Use AnonConst for asm! constants

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Amanieu d'Antras 2021-04-06 05:50:55 +01:00
parent cbd6ec7604
commit 32be124e30
37 changed files with 281 additions and 242 deletions
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64
compiler/rustc_codegen_ssa/src/mir/block.rs
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@ -822,41 +822,37 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
InlineAsmOperandRef::InOut { reg, late, in_value, out_place }
}
mir::InlineAsmOperand::Const { ref value } => {
if let mir::Operand::Constant(constant) = value {
let const_value = self
.eval_mir_constant(constant)
.unwrap_or_else(|_| span_bug!(span, "asm const cannot be resolved"));
let ty = constant.ty();
let size = bx.layout_of(ty).size;
let scalar = match const_value {
ConstValue::Scalar(s) => s,
_ => span_bug!(
span,
"expected Scalar for promoted asm const, but got {:#?}",
const_value
),
};
let value = scalar.assert_bits(size);
let string = match ty.kind() {
ty::Uint(_) => value.to_string(),
ty::Int(int_ty) => {
match int_ty.normalize(bx.tcx().sess.target.pointer_width) {
ty::IntTy::I8 => (value as i8).to_string(),
ty::IntTy::I16 => (value as i16).to_string(),
ty::IntTy::I32 => (value as i32).to_string(),
ty::IntTy::I64 => (value as i64).to_string(),
ty::IntTy::I128 => (value as i128).to_string(),
ty::IntTy::Isize => unreachable!(),
}
let const_value = self
.eval_mir_constant(value)
.unwrap_or_else(|_| span_bug!(span, "asm const cannot be resolved"));
let ty = value.ty();
let size = bx.layout_of(ty).size;
let scalar = match const_value {
ConstValue::Scalar(s) => s,
_ => span_bug!(
span,
"expected Scalar for promoted asm const, but got {:#?}",
const_value
),
};
let value = scalar.assert_bits(size);
let string = match ty.kind() {
ty::Uint(_) => value.to_string(),
ty::Int(int_ty) => {
match int_ty.normalize(bx.tcx().sess.target.pointer_width) {
ty::IntTy::I8 => (value as i8).to_string(),
ty::IntTy::I16 => (value as i16).to_string(),
ty::IntTy::I32 => (value as i32).to_string(),
ty::IntTy::I64 => (value as i64).to_string(),
ty::IntTy::I128 => (value as i128).to_string(),
ty::IntTy::Isize => unreachable!(),
}
ty::Float(ty::FloatTy::F32) => f32::from_bits(value as u32).to_string(),
ty::Float(ty::FloatTy::F64) => f64::from_bits(value as u64).to_string(),
_ => span_bug!(span, "asm const has bad type {}", ty),
};
InlineAsmOperandRef::Const { string }
} else {
span_bug!(span, "asm const is not a constant");
}
}
ty::Float(ty::FloatTy::F32) => f32::from_bits(value as u32).to_string(),
ty::Float(ty::FloatTy::F64) => f64::from_bits(value as u64).to_string(),
_ => span_bug!(span, "asm const has bad type {}", ty),
};
InlineAsmOperandRef::Const { string }
}
mir::InlineAsmOperand::SymFn { ref value } => {
let literal = self.monomorphize(value.literal);