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CryptoPkg/IntrinsicLib: Corrects __ashrdi3 and adds __lshrdi3

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The ashrdi3 function should do arithmetic shift instead of logic using
sar instruction. Also adds __lshrdi3 implementation to correct build
using LLVM

Signed-off-by: Savva Mitrofanov <savvamtr@gmail.com>
This commit is contained in:
Savva Mitrofanov 2023-02-06 23:06:26 +06:00 committed by Mikhail Krichanov
parent 850cf3b628
commit bf04e15d55
1 changed files with 25 additions and 1 deletions
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26
CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.nasm
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@ -23,6 +23,31 @@
;------------------------------------------------------------------------------
global ASM_PFX(__ashrdi3)
ASM_PFX(__ashrdi3):
cmp cl,0x40
jnc ReturnZero
cmp cl,0x20
jnc CounterMore32
shrd eax,edx,cl
sar edx,cl
ret
CounterMore32:
mov eax,edx
xor edx,edx
and cl,0x1f
sar eax,cl
ret
ReturnZero:
xor eax,eax
xor edx,edx
ret
;------------------------------------------------------------------------------
;
; void __cdecl __lshrdi3 (void)
;
;------------------------------------------------------------------------------
global ASM_PFX(__lshrdi3)
ASM_PFX(__lshrdi3):
cmp cl,0x40
jnc _Exit
cmp cl,0x20
@ -40,4 +65,3 @@ _Exit:
xor eax,eax
xor edx,edx
ret