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//@ assembly-output: emit-asm
//@ needs-llvm-components: x86
//@ revisions: TWOFLAGS SINGLEFLAG
//@ compile-flags: --target=x86_64-unknown-linux-gnu
//@ [TWOFLAGS] compile-flags: -C target-feature=+rdrnd -C target-feature=+rdseed
//@ [SINGLEFLAG] compile-flags: -C target-feature=+rdrnd,+rdseed
// Target features set via flags aren't necessarily reflected in the IR, so the only way to test
// them is to build code that requires the features to be enabled to work.
//
// In this particular test if `rdrnd,rdseed` somehow didn't make it to LLVM, the instruction
// selection should crash.
//
// > LLVM ERROR: Cannot select: 0x7f00f400c010: i32,i32,ch = X86ISD::RDSEED 0x7f00f400bfa8:2
// > In function: foo
//
// See also tests/codegen/target-feature-overrides.rs
#![feature(no_core, lang_items, link_llvm_intrinsics, abi_unadjusted)]
#![crate_type = "lib"]
#![no_core]
#[lang = "sized"]
trait Sized {}
#[lang = "copy"]
trait Copy {}
impl Copy for u32 {}
// Use of these requires target features to be enabled
extern "unadjusted" {
#[link_name = "llvm.x86.rdrand.32"]
fn x86_rdrand32_step() -> (u32, i32);
#[link_name = "llvm.x86.rdseed.32"]
fn x86_rdseed32_step() -> (u32, i32);
}
#[no_mangle]
pub unsafe fn foo() -> (u32, u32) {
// CHECK-LABEL: foo:
// CHECK: rdrand
// CHECK: rdseed
(x86_rdrand32_step().0, x86_rdseed32_step().0)
}
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