42 строки
1.3 KiB
ArmAsm
42 строки
1.3 KiB
ArmAsm
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/* __ashrdi3.S: 64-bit arithmetic shift right
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*
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* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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.text
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.p2align 4
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###############################################################################
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#
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# signed long long __ashrdi3(signed long long value [GR8:GR9], unsigned by [GR10])
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#
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###############################################################################
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.globl __ashrdi3
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.type __ashrdi3,@function
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__ashrdi3:
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andicc.p gr10,#63,gr10,icc0
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setlos #32,gr5
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andicc.p gr10,#32,gr0,icc1
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beqlr icc0,#0
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setlos.p #31,gr6
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ckeq icc1,cc4 ; cc4 is true if 0<N<32
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# deal with a shift in the range 1<=N<=31
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csrl.p gr9,gr10,gr9 ,cc4,#1 ; LSW >>= N
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csub gr5,gr10,gr5 ,cc4,#1 ; M = 32 - N
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csll.p gr8,gr5,gr4 ,cc4,#1
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csra gr8,gr10,gr8 ,cc4,#1 ; MSW >>= N
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cor.p gr4,gr9,gr9 ,cc4,#1 ; LSW |= MSW << M
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# deal with a shift in the range 32<=N<=63
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csra gr8,gr10,gr9 ,cc4,#0 ; LSW = MSW >> (N & 31 [implicit AND])
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csra.p gr8,gr6,gr8 ,cc4,#0 ; MSW >>= 31
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bralr
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.size __ashrdi3, .-__ashrdi3
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