Re: [edk2-devel] [PATCH 1/1] ArmPkg/CompilerIntrinsicsLib: provide __ashlti3

["Ard Biesheuvel" <ardb@kernel.org>]

On Thu, 1 Feb 2024 at 03:05, Jeff Brasen <jbrasen@nvidia.com> wrote:
>
> The compiler will use this function if it is left shifting a 128 bit
> value.
>
> Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>

UEFI does not define any 128 bit types, right? How do you end up needing this?


> ---
>  .../CompilerIntrinsicsLib.inf                 |  1 +
>  .../CompilerIntrinsicsLib/AArch64/ashlti3.S   | 33 +++++++++++++++++++
>  2 files changed, 34 insertions(+)
>  create mode 100644 ArmPkg/Library/CompilerIntrinsicsLib/AArch64/ashlti3.S
>
> diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf b/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
> index 7e22e6f67bff..054e68130730 100644
> --- a/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
> +++ b/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
> @@ -66,6 +66,7 @@ [Sources.ARM]
>
>  [Sources.AARCH64]
>    AArch64/Atomics.S    | GCC
> +  AArch64/ashlti3.S    | GCC
>
>  [Packages]
>    MdePkg/MdePkg.dec
> diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/AArch64/ashlti3.S b/ArmPkg/Library/CompilerIntrinsicsLib/AArch64/ashlti3.S
> new file mode 100644
> index 000000000000..79a7b3514c57
> --- /dev/null
> +++ b/ArmPkg/Library/CompilerIntrinsicsLib/AArch64/ashlti3.S
> @@ -0,0 +1,33 @@
> +#------------------------------------------------------------------------------
> +#
> +# Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +#------------------------------------------------------------------------------
> +
> +#include <AsmMacroIoLib.h>
> +
> +ASM_FUNC(__ashlti3)
> +  # return if shift is 0
> +  cbz x2, 1f
> +
> +  mov x3, #64
> +  sub x3, x3, x2
> +  cmp x3, #0
> +  b.le 2f
> +
> +  # shift is <= 64 bits
> +  lsr x3, x0, x3
> +  lsl x1, x1, x2
> +  orr x1, x1, x3
> +  lsl x0, x0, x2
> +1:
> +  ret
> +
> +2:
> +  # shift is > 64
> +  neg w3, w3
> +  lsl x1, x0, x3
> +  mov x0, #0
> +  ret
> --
> 2.34.1
>


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