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target/mips: Add R5900 Multimedia Instruction overview note
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Add a comment on R5900 MMI ASE (short overview).

Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Fredrik Noring <noring@nocrew.org>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
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@frno7 @AMarkovic
frno7 authored and AMarkovic committed Oct 24, 2018
1 parent 6f69281 commit 497f072
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Expand Up @@ -1927,6 +1927,167 @@ enum {
OPC_MXU_Q8MACSU = 0x01,
};

/*
* Overview of the TX79-specific instruction set
* =============================================
*
* The R5900 and the C790 have 128-bit wide GPRs, where the upper 64 bits
* are only used by the specific quadword (128-bit) LQ/SQ load/store
* instructions and certain multimedia instructions (MMIs). These MMIs
* configure the 128-bit data path as two 64-bit, four 32-bit, eight 16-bit
* or sixteen 8-bit paths.
*
* Reference:
*
* The Toshiba TX System RISC TX79 Core Architecture manual,
* https://wiki.qemu.org/File:C790.pdf
*
* Three-Operand Multiply and Multiply-Add (4 instructions)
* --------------------------------------------------------
* MADD [rd,] rs, rt Multiply/Add
* MADDU [rd,] rs, rt Multiply/Add Unsigned
* MULT [rd,] rs, rt Multiply (3-operand)
* MULTU [rd,] rs, rt Multiply Unsigned (3-operand)
*
* Multiply Instructions for Pipeline 1 (10 instructions)
* ------------------------------------------------------
* MULT1 [rd,] rs, rt Multiply Pipeline 1
* MULTU1 [rd,] rs, rt Multiply Unsigned Pipeline 1
* DIV1 rs, rt Divide Pipeline 1
* DIVU1 rs, rt Divide Unsigned Pipeline 1
* MADD1 [rd,] rs, rt Multiply-Add Pipeline 1
* MADDU1 [rd,] rs, rt Multiply-Add Unsigned Pipeline 1
* MFHI1 rd Move From HI1 Register
* MFLO1 rd Move From LO1 Register
* MTHI1 rs Move To HI1 Register
* MTLO1 rs Move To LO1 Register
*
* Arithmetic (19 instructions)
* ----------------------------
* PADDB rd, rs, rt Parallel Add Byte
* PSUBB rd, rs, rt Parallel Subtract Byte
* PADDH rd, rs, rt Parallel Add Halfword
* PSUBH rd, rs, rt Parallel Subtract Halfword
* PADDW rd, rs, rt Parallel Add Word
* PSUBW rd, rs, rt Parallel Subtract Word
* PADSBH rd, rs, rt Parallel Add/Subtract Halfword
* PADDSB rd, rs, rt Parallel Add with Signed Saturation Byte
* PSUBSB rd, rs, rt Parallel Subtract with Signed Saturation Byte
* PADDSH rd, rs, rt Parallel Add with Signed Saturation Halfword
* PSUBSH rd, rs, rt Parallel Subtract with Signed Saturation Halfword
* PADDSW rd, rs, rt Parallel Add with Signed Saturation Word
* PSUBSW rd, rs, rt Parallel Subtract with Signed Saturation Word
* PADDUB rd, rs, rt Parallel Add with Unsigned saturation Byte
* PSUBUB rd, rs, rt Parallel Subtract with Unsigned saturation Byte
* PADDUH rd, rs, rt Parallel Add with Unsigned saturation Halfword
* PSUBUH rd, rs, rt Parallel Subtract with Unsigned saturation Halfword
* PADDUW rd, rs, rt Parallel Add with Unsigned saturation Word
* PSUBUW rd, rs, rt Parallel Subtract with Unsigned saturation Word
*
* Min/Max (4 instructions)
* ------------------------
* PMAXH rd, rs, rt Parallel Maximum Halfword
* PMINH rd, rs, rt Parallel Minimum Halfword
* PMAXW rd, rs, rt Parallel Maximum Word
* PMINW rd, rs, rt Parallel Minimum Word
*
* Absolute (2 instructions)
* -------------------------
* PABSH rd, rt Parallel Absolute Halfword
* PABSW rd, rt Parallel Absolute Word
*
* Logical (4 instructions)
* ------------------------
* PAND rd, rs, rt Parallel AND
* POR rd, rs, rt Parallel OR
* PXOR rd, rs, rt Parallel XOR
* PNOR rd, rs, rt Parallel NOR
*
* Shift (9 instructions)
* ----------------------
* PSLLH rd, rt, sa Parallel Shift Left Logical Halfword
* PSRLH rd, rt, sa Parallel Shift Right Logical Halfword
* PSRAH rd, rt, sa Parallel Shift Right Arithmetic Halfword
* PSLLW rd, rt, sa Parallel Shift Left Logical Word
* PSRLW rd, rt, sa Parallel Shift Right Logical Word
* PSRAW rd, rt, sa Parallel Shift Right Arithmetic Word
* PSLLVW rd, rt, rs Parallel Shift Left Logical Variable Word
* PSRLVW rd, rt, rs Parallel Shift Right Logical Variable Word
* PSRAVW rd, rt, rs Parallel Shift Right Arithmetic Variable Word
*
* Compare (6 instructions)
* ------------------------
* PCGTB rd, rs, rt Parallel Compare for Greater Than Byte
* PCEQB rd, rs, rt Parallel Compare for Equal Byte
* PCGTH rd, rs, rt Parallel Compare for Greater Than Halfword
* PCEQH rd, rs, rt Parallel Compare for Equal Halfword
* PCGTW rd, rs, rt Parallel Compare for Greater Than Word
* PCEQW rd, rs, rt Parallel Compare for Equal Word
*
* LZC (1 instruction)
* -------------------
* PLZCW rd, rs Parallel Leading Zero or One Count Word
*
* Quadword Load and Store (2 instructions)
* ----------------------------------------
* LQ rt, offset(base) Load Quadword
* SQ rt, offset(base) Store Quadword
*
* Multiply and Divide (19 instructions)
* -------------------------------------
* PMULTW rd, rs, rt Parallel Multiply Word
* PMULTUW rd, rs, rt Parallel Multiply Unsigned Word
* PDIVW rs, rt Parallel Divide Word
* PDIVUW rs, rt Parallel Divide Unsigned Word
* PMADDW rd, rs, rt Parallel Multiply-Add Word
* PMADDUW rd, rs, rt Parallel Multiply-Add Unsigned Word
* PMSUBW rd, rs, rt Parallel Multiply-Subtract Word
* PMULTH rd, rs, rt Parallel Multiply Halfword
* PMADDH rd, rs, rt Parallel Multiply-Add Halfword
* PMSUBH rd, rs, rt Parallel Multiply-Subtract Halfword
* PHMADH rd, rs, rt Parallel Horizontal Multiply-Add Halfword
* PHMSBH rd, rs, rt Parallel Horizontal Multiply-Subtract Halfword
* PDIVBW rs, rt Parallel Divide Broadcast Word
* PMFHI rd Parallel Move From HI Register
* PMFLO rd Parallel Move From LO Register
* PMTHI rs Parallel Move To HI Register
* PMTLO rs Parallel Move To LO Register
* PMFHL rd Parallel Move From HI/LO Register
* PMTHL rs Parallel Move To HI/LO Register
*
* Pack/Extend (11 instructions)
* -----------------------------
* PPAC5 rd, rt Parallel Pack to 5 bits
* PPACB rd, rs, rt Parallel Pack to Byte
* PPACH rd, rs, rt Parallel Pack to Halfword
* PPACW rd, rs, rt Parallel Pack to Word
* PEXT5 rd, rt Parallel Extend Upper from 5 bits
* PEXTUB rd, rs, rt Parallel Extend Upper from Byte
* PEXTLB rd, rs, rt Parallel Extend Lower from Byte
* PEXTUH rd, rs, rt Parallel Extend Upper from Halfword
* PEXTLH rd, rs, rt Parallel Extend Lower from Halfword
* PEXTUW rd, rs, rt Parallel Extend Upper from Word
* PEXTLW rd, rs, rt Parallel Extend Lower from Word
*
* Others (16 instructions)
* ------------------------
* PCPYH rd, rt Parallel Copy Halfword
* PCPYLD rd, rs, rt Parallel Copy Lower Doubleword
* PCPYUD rd, rs, rt Parallel Copy Upper Doubleword
* PREVH rd, rt Parallel Reverse Halfword
* PINTH rd, rs, rt Parallel Interleave Halfword
* PINTEH rd, rs, rt Parallel Interleave Even Halfword
* PEXEH rd, rt Parallel Exchange Even Halfword
* PEXCH rd, rt Parallel Exchange Center Halfword
* PEXEW rd, rt Parallel Exchange Even Word
* PEXCW rd, rt Parallel Exchange Center Word
* QFSRV rd, rs, rt Quadword Funnel Shift Right Variable
* MFSA rd Move from Shift Amount Register
* MTSA rs Move to Shift Amount Register
* MTSAB rs, immediate Move Byte Count to Shift Amount Register
* MTSAH rs, immediate Move Halfword Count to Shift Amount Register
* PROT3W rd, rt Parallel Rotate 3 Words
*/

/* global register indices */
static TCGv cpu_gpr[32], cpu_PC;
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