bjoernager/rust
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Rollup merge of #125266 - workingjubilee:stream-plastic-love, r=RalfJung,nikic

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compiler: add simd_ctpop intrinsic

Fairly straightforward addition.

cc `@rust-lang/opsem` new (extremely boring) intrinsic
This commit is contained in:
Matthias Krüger 2024-05-21 12:47:06 +02:00 • committed by GitHub
commit fd975f75fa
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10 changed files with 95 additions and 40 deletions
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48
compiler/rustc_codegen_llvm/src/intrinsic.rs
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@ -2336,7 +2336,10 @@ fn generic_simd_intrinsic<'ll, 'tcx>(
}
// Unary integer intrinsics
if matches!(name, sym::simd_bswap | sym::simd_bitreverse | sym::simd_ctlz | sym::simd_cttz) {
if matches!(
name,
sym::simd_bswap | sym::simd_bitreverse | sym::simd_ctlz | sym::simd_ctpop | sym::simd_cttz
) {
let vec_ty = bx.cx.type_vector(
match *in_elem.kind() {
ty::Int(i) => bx.cx.type_int_from_ty(i),
@ -2354,31 +2357,38 @@ fn generic_simd_intrinsic<'ll, 'tcx>(
sym::simd_bswap => "bswap",
sym::simd_bitreverse => "bitreverse",
sym::simd_ctlz => "ctlz",
sym::simd_ctpop => "ctpop",
sym::simd_cttz => "cttz",
_ => unreachable!(),
};
let int_size = in_elem.int_size_and_signed(bx.tcx()).0.bits();
let llvm_intrinsic = &format!("llvm.{}.v{}i{}", intrinsic_name, in_len, int_size,);
return if name == sym::simd_bswap && int_size == 8 {
return match name {
// byte swap is no-op for i8/u8
Ok(args[0].immediate())
} else 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);
Ok(bx.call(
fn_ty,
None,
None,
f,
&[args[0].immediate(), bx.const_int(bx.type_i1(), 0)],
None,
None,
))
} else {
let fn_ty = bx.type_func(&[vec_ty], vec_ty);
let f = bx.declare_cfn(llvm_intrinsic, llvm::UnnamedAddr::No, fn_ty);
Ok(bx.call(fn_ty, None, None, f, &[args[0].immediate()], None, None))
sym::simd_bswap if int_size == 8 => Ok(args[0].immediate()),
sym::simd_ctlz | sym::simd_cttz => {
// for the (int, i1 immediate) pair, the second arg adds `(0, true) => poison`
let fn_ty = bx.type_func(&[vec_ty, bx.type_i1()], vec_ty);
let dont_poison_on_zero = bx.const_int(bx.type_i1(), 0);
let f = bx.declare_cfn(llvm_intrinsic, llvm::UnnamedAddr::No, fn_ty);
Ok(bx.call(
fn_ty,
None,
None,
f,
&[args[0].immediate(), dont_poison_on_zero],
None,
None,
))
}
sym::simd_bswap | sym::simd_bitreverse | sym::simd_ctpop => {
// simple unary argument cases
let fn_ty = bx.type_func(&[vec_ty], vec_ty);
let f = bx.declare_cfn(llvm_intrinsic, llvm::UnnamedAddr::No, fn_ty);
Ok(bx.call(fn_ty, None, None, f, &[args[0].immediate()], None, None))
}
_ => unreachable!(),
};
}