mirror of https://github.com/acidanthera/audk.git
49 lines
1.3 KiB
NASM
49 lines
1.3 KiB
NASM
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php.
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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; Module Name:
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;
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; MathLShiftS64.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 signed value left by a certain number of bits.
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;
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;------------------------------------------------------------------------------
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SECTION .text
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global ASM_PFX(__ashldi3)
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;------------------------------------------------------------------------------
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;
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; void __cdecl __ashldi3 (void)
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;
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;------------------------------------------------------------------------------
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ASM_PFX(__ashldi3):
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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 More32
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shld edx,eax,cl
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shl eax,cl
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ret
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More32:
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mov edx,eax
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xor eax,eax
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and cl,0x1f
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shl edx,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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