| //@ 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) |
| } |
