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Auto merge of #114156 - calebzulawski:simd-bswap, r=compiler-errors

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Add simd_bswap, simd_bitreverse, simd_ctlz, and simd_cttz intrinsics

cc `@workingjubilee`
This commit is contained in:
bors 2023-07-29 18:51:45 +00:00
commit 03a57254b5
6 changed files with 173 additions and 25 deletions
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47
compiler/rustc_codegen_llvm/src/intrinsic.rs
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@ -2074,6 +2074,53 @@ fn generic_simd_intrinsic<'ll, 'tcx>(
simd_neg: Int => neg, Float => fneg;
}
// Unary integer intrinsics
if matches!(name, sym::simd_bswap | sym::simd_bitreverse | sym::simd_ctlz | sym::simd_cttz) {
let vec_ty = bx.cx.type_vector(
match *in_elem.kind() {
ty::Int(i) => bx.cx.type_int_from_ty(i),
ty::Uint(i) => bx.cx.type_uint_from_ty(i),
_ => return_error!(InvalidMonomorphization::UnsupportedOperation {
span,
name,
in_ty,
in_elem
}),
},
in_len as u64,
);
let intrinsic_name = match name {
sym::simd_bswap => "bswap",
sym::simd_bitreverse => "bitreverse",
sym::simd_ctlz => "ctlz",
sym::simd_cttz => "cttz",
_ => unreachable!(),
};
let llvm_intrinsic = &format!(
"llvm.{}.v{}i{}",
intrinsic_name,
in_len,
in_elem.int_size_and_signed(bx.tcx()).0.bits(),
);
return Ok(if matches!(name, sym::simd_ctlz | sym::simd_cttz) {
let fn_ty = bx.type_func(&[vec_ty, bx.type_i1()], vec_ty);
let f = bx.declare_cfn(llvm_intrinsic, llvm::UnnamedAddr::No, fn_ty);
bx.call(
fn_ty,
None,
None,
f,
&[args[0].immediate(), bx.const_int(bx.type_i1(), 0)],
None,
)
} else {
let fn_ty = bx.type_func(&[vec_ty], vec_ty);
let f = bx.declare_cfn(llvm_intrinsic, llvm::UnnamedAddr::No, fn_ty);
bx.call(fn_ty, None, None, f, &[args[0].immediate()], None)
});
}
if name == sym::simd_arith_offset {
// This also checks that the first operand is a ptr type.
let pointee = in_elem.builtin_deref(true).unwrap_or_else(|| {