mirror of https://github.com/acidanthera/audk.git
68 lines
1.5 KiB
NASM
68 lines
1.5 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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; Module Name:
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;
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; MathRShiftU64.nasm
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;
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; Abstract:
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;
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; 64-bit Math Worker Function.
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; Shifts a 64-bit unsigned value right by a certain number of bits.
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;
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;------------------------------------------------------------------------------
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SECTION .text
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;------------------------------------------------------------------------------
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;
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; void __cdecl __ashrdi3 (void)
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;
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;------------------------------------------------------------------------------
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global ASM_PFX(__ashrdi3)
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ASM_PFX(__ashrdi3):
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cmp cl,0x40
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jnc ReturnZero
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cmp cl,0x20
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jnc CounterMore32
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shrd eax,edx,cl
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sar edx,cl
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ret
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CounterMore32:
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mov eax,edx
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xor edx,edx
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and cl,0x1f
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sar eax,cl
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ret
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ReturnZero:
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xor eax,eax
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xor edx,edx
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ret
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;------------------------------------------------------------------------------
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;
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; void __cdecl __lshrdi3 (void)
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;
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;------------------------------------------------------------------------------
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global ASM_PFX(__lshrdi3)
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ASM_PFX(__lshrdi3):
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cmp cl,0x40
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jnc _Exit
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cmp cl,0x20
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jnc More32
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shrd eax,edx,cl
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shr edx,cl
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ret
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More32:
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mov eax,edx
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xor edx,edx
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and cl,0x1f
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shr eax,cl
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ret
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_Exit:
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xor eax,eax
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xor edx,edx
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ret
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