[llvm-dev] There is an error “use of unknown builtin”

[沈天豪 via llvm-dev]

Thank you for your suggesttion.
I have already  written the defined as following:

BUILTIN(__builtin_x86_max_qb, "iii", "")



在 2018-09-13 01:49:19，"Friedman, Eli" <efriedma at codeaurora.org> 写道：

On 9/12/2018 6:36 AM, 沈天豪 via llvm-dev wrote:

Hello，everyone.
I am very embarrassed to ask such a simple question.
I want to add an intrinsics(named max_qb) in x86 backend.
In include/llvm/IR/IntrinsicsX86.td, I add a intrinsics (GCCBuiltin).
In clang( BuiltinsX86.def ), I add a BUILTIN.
And in x86 backend , I change :

the X86InstrInfo.td to add def X86max_qb_flag ,

X86InstrArithmetic.td to add define of instruction ,
X86ISelLowering.cpp to add SDnode.
It's succeed when LLVM compilates.But there is an error “use of unknown builtin '__builtin_x86_max_qb' ”，when I test the intrinsics.

All clang builtins are required to have a C language signature defined in clang; for x86, look in include/clang/Basic/BuiltinsX86.def .

-Eli
-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
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