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