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Implement _rdtsc x86 vendor intrinsic

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Fixes rust-lang/rustc_codegen_cranelift#1493
This commit is contained in:
bjorn3 2024-06-02 11:18:51 +02:00
parent ab10da27a1
commit 8f1d41e2a0
1 changed files with 30 additions and 0 deletions
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30
src/intrinsics/llvm_x86.rs
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@ -1416,6 +1416,36 @@ fn select4(
ret.write_cvalue(fx, res);
}
"llvm.x86.rdtsc" => {
// https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_rdtsc&ig_expand=5273
let res_place = CPlace::new_stack_slot(
fx,
fx.layout_of(Ty::new_tup(fx.tcx, &[fx.tcx.types.u32, fx.tcx.types.u32])),
);
let eax_place = res_place.place_field(fx, FieldIdx::new(0));
let edx_place = res_place.place_field(fx, FieldIdx::new(1));
codegen_inline_asm_inner(
fx,
&[InlineAsmTemplatePiece::String("rdtsc".to_string())],
&[
CInlineAsmOperand::Out {
reg: InlineAsmRegOrRegClass::Reg(InlineAsmReg::X86(X86InlineAsmReg::ax)),
late: true,
place: Some(eax_place),
},
CInlineAsmOperand::Out {
reg: InlineAsmRegOrRegClass::Reg(InlineAsmReg::X86(X86InlineAsmReg::dx)),
late: true,
place: Some(edx_place),
},
],
InlineAsmOptions::NOSTACK | InlineAsmOptions::NOMEM,
);
let res = res_place.to_cvalue(fx);
ret.write_cvalue_transmute(fx, res);
}
_ => {
fx.tcx
.dcx()