46 lines
1.1 KiB
ArmAsm
Executable File
46 lines
1.1 KiB
ArmAsm
Executable File
! SPDX-License-Identifier: GPL-2.0
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! Copyright (C) 2012 by Imagination Technologies Ltd.
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!
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! 64-bit multiply routine.
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!
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!
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! 64-bit signed/unsigned multiply
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!
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! A = D1Ar1:D0Ar2 = a 2^48 + b 2^32 + c 2^16 + d 2^0
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!
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! B = D1Ar3:D0Ar4 = w 2^48 + x 2^32 + y 2^16 + z 2^0
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!
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.text
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.global ___muldi3
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.type ___muldi3,function
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___muldi3:
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MULD D1Re0,D1Ar1,D0Ar4 ! (a 2^48 + b 2^32)(y 2^16 + z 2^0)
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MULD D0Re0,D0Ar2,D1Ar3 ! (w 2^48 + x 2^32)(c 2^16 + d 2^0)
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ADD D1Re0,D1Re0,D0Re0
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MULW D0Re0,D0Ar2,D0Ar4 ! (d 2^0) * (z 2^0)
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RTDW D0Ar2,D0Ar2
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MULW D0Ar6,D0Ar2,D0Ar4 ! (c 2^16)(z 2^0)
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LSR D1Ar5,D0Ar6,#16
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LSL D0Ar6,D0Ar6,#16
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ADDS D0Re0,D0Re0,D0Ar6
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ADDCS D1Re0,D1Re0,#1
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RTDW D0Ar4,D0Ar4
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ADD D1Re0,D1Re0,D1Ar5
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MULW D0Ar6,D0Ar2,D0Ar4 ! (c 2^16)(y 2^16)
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ADD D1Re0,D1Re0,D0Ar6
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RTDW D0Ar2,D0Ar2
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MULW D0Ar6,D0Ar2,D0Ar4 ! (d 2^0)(y 2^16)
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LSR D1Ar5,D0Ar6,#16
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LSL D0Ar6,D0Ar6,#16
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ADDS D0Re0,D0Re0,D0Ar6
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ADD D1Re0,D1Re0,D1Ar5
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ADDCS D1Re0,D1Re0,#1
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MOV PC, D1RtP
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.size ___muldi3,.-___muldi3
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