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Merge pull request #335 from rust-lang/feature/rdrand64

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Implement llvm.x86.rdrand.64
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antoyo 2023-09-18 19:18:13 -04:00 committed by GitHub
commit 6118ee488a
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1 changed files with 19 additions and 0 deletions
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19
src/intrinsic/llvm.rs
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@ -242,6 +242,11 @@ pub fn adjust_intrinsic_arguments<'a, 'b, 'gcc, 'tcx>(builder: &Builder<'a, 'gcc
new_args.pop();
args = new_args.into();
},
// The GCC version returns one value of the tuple through a pointer.
"__builtin_ia32_rdrand64_step" => {
let arg = builder.current_func().new_local(None, builder.ulonglong_type, "return_rdrand_arg");
args = vec![arg.get_address(None)].into();
},
_ => (),
}
}
@ -362,6 +367,19 @@ pub fn adjust_intrinsic_return_value<'a, 'gcc, 'tcx>(builder: &Builder<'a, 'gcc,
// builtin twice, we overwrite the return value with a dummy value.
return_value = builder.context.new_rvalue_zero(builder.int_type);
},
"__builtin_ia32_rdrand64_step" => {
let random_number = args[0].dereference(None).to_rvalue();
let success_variable = builder.current_func().new_local(None, return_value.get_type(), "success");
builder.llbb().add_assignment(None, success_variable, return_value);
let field1 = builder.context.new_field(None, random_number.get_type(), "random_number");
let field2 = builder.context.new_field(None, return_value.get_type(), "success");
let struct_type = builder.context.new_struct_type(None, "rdrand_result", &[field1, field2]);
return_value = builder.context.new_struct_constructor(None, struct_type.as_type(), None, &[
random_number,
success_variable.to_rvalue(),
]);
},
_ => (),
}
@ -614,6 +632,7 @@ pub fn intrinsic<'gcc, 'tcx>(name: &str, cx: &CodegenCx<'gcc, 'tcx>) -> Function
"llvm.fshr.v8i16" => "__builtin_ia32_vpshrdv_v8hi",
"llvm.x86.fma.vfmadd.sd" => "__builtin_ia32_vfmaddsd3",
"llvm.x86.fma.vfmadd.ss" => "__builtin_ia32_vfmaddss3",
"llvm.x86.rdrand.64" => "__builtin_ia32_rdrand64_step",
// The above doc points to unknown builtins for the following, so override them:
"llvm.x86.avx2.gather.d.d" => "__builtin_ia32_gathersiv4si",