Custom Operations

All of custom operations use "unsigned int" as arguments. The following are all of the operations you might find useful:

A

B

C

  • CARRY(a, b) -- Compute carry bit from unsigned add.
  • COPYBACK(a, n) -- Copy back to memory location a, n bytes.

D

  • DSPIABS(a) -- Clipped absolute value.
  • DSPIADD(a, b) -- Clipped signed add.
  • DSPIDUALABS(a) -- Dual clipped absolute value of signed 16-bit halfwords.
  • DSPIDUALADD(a, b) -- Dual clipped add of signed 16-bit halfwords.
  • DSPIDUALSUB(a, b) -- Dual clipped subtraction of signed 16-bit halfwords.
  • DSPIDUALMUL(a, b) -- Dual clipped multiplication of signed 16-bit halfwords.
  • DSPIMUL(a, b) -- Clipped signed multiplication.
  • DSPISUB(a, b) -- Clipped signed subtract.
  • DSPUMUL(a, b) -- Clipped unsigned multiplication.
  • DSPUQUADADUI(a, b) -- Quad clipped add of unsigned/signed bytes.
  • DSPUSUB(a, b) -- Clipped unsigned subtraction.
  • DUALASR(a, b) -- Dul 16 arithmetic shift right.

F

  • FUNSHIFT1(a, b) -- Funnel-shift 1 byte.
  • FUNSHIFT2(a, b) -- Funnel-shift 2 bytes.
  • FUNSHIFT3(a, b) -- Funnel-shift 3 bytes.

I

  • IABS(a) -- The absolute value of a.
  • IADDI(imm, a) -- Integer add with immediate.
  • IAVGONEP(a, b) -- Signed average.
  • IBYTESEL(a, sel) -- Select signed byte.
  • ICLIPI(a, b) -- Clip signed to signed.
  • IEQLI(imm, a) -- Signed compare equal with immediate.
  • IFIR16(a, b) -- Sum of products of signed 16-bit halfwords.
  • IFIR8II(a, b) -- Signed sum of products of signed bytes.
  • IFIR8IU(a, b) -- Signed sum of products of signed/unsigned bytes.
  • IFIR8UI(a, b) -- Signed sum of products of unsigned/signed bytes.
  • IFLIP(a, b) -- If non-zero, negate.
  • IGEQI(imm, a) -- Signed compare greater than or equal to with immediate.
  • IGTRI(imm, a) -- Signed compare greater than with immediate.
  • ILESI(imm, a) -- Signed compare less with immediate.
  • ILEQI(imm, a) -- Signed compare less than or equal to with immediate.
  • IMAX(a, b) -- The integer maximum between a and b
  • IMIN(a, b) -- The integer minimum between a and b.
  • IMULM(a, b) -- Signed multiply, return most-significant 32 bits
  • INEG(a) -- The negation of a.
  • INEQI(imm, a) -- Signed compare not equal with immediate.
  • INONZERO(a, b) -- If nonzero, selecgt non-zero.
  • INVALIDATE(a, n) -- Invalidate in the cache address a for n bytes.
  • ISUBI(imm, a) -- Integer subtract with immediate.
  • IZERO(a, b) -- If zero, select zero.

L

  • LSRI(shift, a) -- Logical shift right immediate.
  • LSLI(shift, a) -- Logical shift left immediate.

M

  • MERGEDUAL16LSB(a, b) -- Merge dual 16 bit least significant bytes.
  • MERGELSB(a, b) -- Merge least significant bytes.
  • MERGEMSB(a, b) -- Merge most significant bytes.
  • MUX(a, b, c) -- If a is true, return b, otherwise return c.

P

  • PACKBYTES(a, b) -- Pack least significant byte. (returns lsbs of a:b)
  • PACK16MSB(a, b) -- Pack 16 most significant bits.
  • PACK16LSB(a, b) -- Pack 16 least significant bits.
  • PREFETCH(a, n) -- Prefetch n blocks (1 block = 64 bytes) starting at a into the cache.

Q

  • QUADAVG(a, b) -- Unsigned byte-wise quad average.
  • QUADUMAX(a, b) -- Unsigned byte-wise quad maximum.
  • QUADUMIN(a, b) -- Unsigned byte-wise quad minimum.
  • QUADUMULMSB(a, b) -- Unsigned quad 8-bit multiply most significant.

R

  • ROL(a, b) -- Rotate a left b times.
  • ROLI(shift, a) -- Rotate left immediate.

S

  • SEX8(a) -- Sign extend eight bits.
  • SEX16(a) -- Sign extend sixteen bits.

U

  • UBYTESEL(a, sel) -- Select unsigned byte.
  • UCLIPI(a, b) -- Clip signed to unsigned.
  • UCLIPU(a, b) -- Clip unsigned to unsigned.
  • UEQLI(imm, a) -- Unsigned compare equal with immediate.
  • UFIR16(a, b) -- Sum of products of unsigned 16-bit halfwords.
  • UFIR8UU(a, b) -- Unsigned sum of products of unsigned bytes.
  • UGEQI(imm, a) -- Unsigned compare greater than or equal to with immediate.
  • UGTRI(imm, a) -- Unsigned compare greater than with immediate.
  • ULEQI(imm, a) -- Unsigned compare less than or equal to immediate.
  • ULESI(imm, a) -- Unsigned compare less than immediate.
  • UME8II(a, b) -- Unsigned sum of absolute values of signed 8-bit differences.
  • UME8UU(a, b) -- Sum of absolute values of unsigned 8-bit differences.
  • UMULM(a, b) -- Unsigned multiply, return most-significant 32 bits.
  • UNEQI(imm, a) -- Unsigned compare not equal with immediate.

Z

  • ZEX8(a) -- Zero extend eight bits.
  • ZEX16(a) -- Zero extend sixteen bits.

CS122B, Winter 2002.