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//! Emulation of a subset of the cpuid x86 instruction.
use crate::prelude::*;
/// Emulates a subset of the cpuid x86 instruction.
///
/// This emulates an intel cpu with sse and sse2 support, but which doesn't support anything else.
pub(crate) fn codegen_cpuid_call<'tcx>(
fx: &mut FunctionCx<'_, '_, 'tcx>,
leaf: Value,
_sub_leaf: Value,
) -> (Value, Value, Value, Value) {
let leaf_0 = fx.bcx.create_block();
let leaf_1 = fx.bcx.create_block();
let leaf_7 = fx.bcx.create_block();
let leaf_8000_0000 = fx.bcx.create_block();
let leaf_8000_0001 = fx.bcx.create_block();
let unsupported_leaf = fx.bcx.create_block();
let dest = fx.bcx.create_block();
let eax = fx.bcx.append_block_param(dest, types::I32);
let ebx = fx.bcx.append_block_param(dest, types::I32);
let ecx = fx.bcx.append_block_param(dest, types::I32);
let edx = fx.bcx.append_block_param(dest, types::I32);
let mut switch = cranelift_frontend::Switch::new();
switch.set_entry(0, leaf_0);
switch.set_entry(1, leaf_1);
switch.set_entry(7, leaf_7);
switch.set_entry(0x8000_0000, leaf_8000_0000);
switch.set_entry(0x8000_0001, leaf_8000_0001);
switch.emit(&mut fx.bcx, leaf, unsupported_leaf);
fx.bcx.switch_to_block(leaf_0);
let max_basic_leaf = fx.bcx.ins().iconst(types::I32, 1);
let vend0 = fx.bcx.ins().iconst(types::I32, i64::from(u32::from_le_bytes(*b"Genu")));
let vend2 = fx.bcx.ins().iconst(types::I32, i64::from(u32::from_le_bytes(*b"ineI")));
let vend1 = fx.bcx.ins().iconst(types::I32, i64::from(u32::from_le_bytes(*b"ntel")));
fx.bcx.ins().jump(dest, &[max_basic_leaf, vend0, vend1, vend2]);
fx.bcx.switch_to_block(leaf_1);
let cpu_signature = fx.bcx.ins().iconst(types::I32, 0);
let additional_information = fx.bcx.ins().iconst(types::I32, 0);
let ecx_features = fx.bcx.ins().iconst(types::I32, 0);
let edx_features = fx.bcx.ins().iconst(types::I32, 1 << 25 /* sse */ | 1 << 26 /* sse2 */);
fx.bcx.ins().jump(dest, &[cpu_signature, additional_information, ecx_features, edx_features]);
fx.bcx.switch_to_block(leaf_7);
// This leaf technically has subleaves, but we just return zero for all subleaves.
let zero = fx.bcx.ins().iconst(types::I32, 0);
fx.bcx.ins().jump(dest, &[zero, zero, zero, zero]);
fx.bcx.switch_to_block(leaf_8000_0000);
let extended_max_basic_leaf = fx.bcx.ins().iconst(types::I32, 0);
let zero = fx.bcx.ins().iconst(types::I32, 0);
fx.bcx.ins().jump(dest, &[extended_max_basic_leaf, zero, zero, zero]);
fx.bcx.switch_to_block(leaf_8000_0001);
let zero = fx.bcx.ins().iconst(types::I32, 0);
let proc_info_ecx = fx.bcx.ins().iconst(types::I32, 0);
let proc_info_edx = fx.bcx.ins().iconst(types::I32, 0);
fx.bcx.ins().jump(dest, &[zero, zero, proc_info_ecx, proc_info_edx]);
fx.bcx.switch_to_block(unsupported_leaf);
crate::trap::trap_unreachable(
fx,
"__cpuid_count arch intrinsic doesn't yet support specified leaf",
);
fx.bcx.switch_to_block(dest);
fx.bcx.ins().nop();
(eax, ebx, ecx, edx)
}
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