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ArmPkg/CompilerIntrinsicsLib: provide __ashlti3 #73

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ArmPkg/CompilerIntrinsicsLib: provide __ashlti3 #73

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33 changes: 33 additions & 0 deletions ArmPkg/Library/CompilerIntrinsicsLib/AArch64/ashlti3.S
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Original file line number Diff line number Diff line change
@@ -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
1 change: 1 addition & 0 deletions ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,7 @@

[Sources.AARCH64]
AArch64/Atomics.S | GCC
AArch64/ashlti3.S | GCC

[Packages]
MdePkg/MdePkg.dec
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