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/** @file
64-bit Math Worker Function.
The 32-bit versions of C compiler generate calls to library routines
to handle 64-bit math. These functions use non-standard calling conventions.
Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
/*
* Shifts a 64-bit signed value left by a particular number of bits.
*/
__declspec(naked) void __cdecl _allshl (void)
{
_asm {
;
; Handle shifting of 64 or more bits (return 0)
;
cmp cl, 64
jae short ReturnZero
;
; Handle shifting of between 0 and 31 bits
;
cmp cl, 32
jae short More32
shld edx, eax, cl
shl eax, cl
ret
;
; Handle shifting of between 32 and 63 bits
;
More32:
mov edx, eax
xor eax, eax
and cl, 31
shl edx, cl
ret
ReturnZero:
xor eax,eax
xor edx,edx
ret
}
}
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