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79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
// -*- C -*-
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//
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// NEC specific instructions
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//
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// Integer Instructions
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// --------------------
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//
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// MulAcc is the Multiply Accumulator.
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// This register is mapped on the the HI and LO registers.
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// Upper 32 bits of MulAcc is mapped on to lower 32 bits of HI register.
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// Lower 32 bits of MulAcc is mapped on to lower 32 bits of LO register.
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:function:::unsigned64:MulAcc:
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*vr4100:
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{
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unsigned64 result = U8_4 (HI, LO);
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return result;
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}
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:function:::void:SET_MulAcc:unsigned64 value
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*vr4100:
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{
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/* 64 bit specific */
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*AL4_8 (&HI) = VH4_8 (value);
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*AL4_8 (&LO) = VL4_8 (value);
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}
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:function:::signed64:SignedMultiply:signed32 l, signed32 r
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*vr4100:
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{
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signed64 result = (signed64) l * (signed64) r;
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return result;
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}
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:function:::unsigned64:UnsignedMultiply:unsigned32 l, unsigned32 r
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*vr4100:
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{
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unsigned64 result = (unsigned64) l * (unsigned64) r;
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return result;
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}
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:function:::unsigned64:Low32Bits:unsigned64 value
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*vr4100:
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{
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unsigned64 result = (signed64) (signed32) VL4_8 (value);
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return result;
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}
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:function:::unsigned64:High32Bits:unsigned64 value
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*vr4100:
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{
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unsigned64 result = (signed64) (signed32) VH4_8 (value);
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return result;
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}
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// Multiply, Accumulate
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000000,5.RS,5.RT,00000,00000,101000::64::MAC
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"mac r<RS>, r<RT>"
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*vr4100:
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{
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SET_MulAcc (SD_, MulAcc (SD_) + SignedMultiply (SD_, GPR[RS], GPR[RT]));
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}
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// D-Multiply, Accumulate
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000000,5.RS,5.RT,00000,00000,101001::64::DMAC
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"dmac r<RS>, r<RT>"
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*vr4100:
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{
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LO = LO + SignedMultiply (SD_, GPR[RS], GPR[RT]);
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}
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