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# core.simd

Builtin SIMD intrinsics

Source core/simd.d

License:
Boost License 1.0.
Authors:
Walter Bright,

template `Vector`(T)
  Create a vector type.

  Parameters T = one of double[2], float[4], void[16], byte[16], ubyte[16], short[8], ushort[8], int[4], uint[4], long[2], ulong[2]. For 256 bit vectors, one of double[4], float[8], void[32], byte[32], ubyte[32], short[16], ushort[16], int[8], uint[8], long[4], ulong[4]

alias `void16` = __vector(void[16]);
alias `double2` = __vector(double[2]);
alias `float4` = __vector(float[4]);
alias `byte16` = __vector(byte[16]);
alias `ubyte16` = __vector(ubyte[16]);
alias `short8` = __vector(short[8]);
alias `ushort8` = __vector(ushort[8]);
alias `int4` = __vector(int[4]);
alias `uint4` = __vector(uint[4]);
alias `long2` = __vector(long[2]);
alias `ulong2` = __vector(ulong[2]);
enum `XMM`: int;
  XMM opcodes that conform to the following:
  opcode xmm1,xmm2/mem
  and do not have side effects (i.e. do not write to memory).
pure nothrow @nogc @safe void16 `__simd`(XMM `opcode`, void16 `op1`, void16 `op2`);
  Generate two operand instruction with XMM 128 bit operands.
  This is a compiler magic function - it doesn't behave like regular D functions.

  Parameters opcode = any of the XMM opcodes; it must be a compile time constant op1 = first operand op2 = second operand

  Returns:
  result of opcode
  Examples:

      float4 a;
      a = cast(float4)__simd(XMM.PXOR, a, a);

pure nothrow @nogc @safe void16 `__simd`(XMM `opcode`, void16 `op1`);
  Unary SIMD instructions.
pure nothrow @nogc @safe void16 `__simd`(XMM `opcode`, double `d`);
pure nothrow @nogc @safe void16 `__simd`(XMM `opcode`, float `f`);
  Examples:

      float4 a;
      a = cast(float4)__simd(XMM.LODSS, a);

pure nothrow @nogc @safe void16 `__simd`(XMM `opcode`, void16 `op1`, void16 `op2`, ubyte `imm8`);
  For instructions: CMPPD, CMPSS, CMPSD, CMPPS, PSHUFD, PSHUFHW, PSHUFLW, BLENDPD, BLENDPS, DPPD, DPPS, MPSADBW, PBLENDW, ROUNDPD, ROUNDPS, ROUNDSD, ROUNDSS

  Parameters opcode = any of the above XMM opcodes; it must be a compile time constant op1 = first operand op2 = second operand imm8 = third operand; must be a compile time constant

  Returns:
  result of opcode
  Examples:

      float4 a;
      a = cast(float4)__simd(XMM.CMPPD, a, a, 0x7A);

pure nothrow @nogc @safe void16 `__simd_ib`(XMM `opcode`, void16 `op1`, ubyte `imm8`);
  For instructions with the imm8 version: PSLLD, PSLLQ, PSLLW, PSRAD, PSRAW, PSRLD, PSRLQ, PSRLW, PSRLDQ, PSLLDQ

  Parameters opcode = any of the XMM opcodes; it must be a compile time constant op1 = first operand imm8 = second operand; must be a compile time constant

  Returns:
  result of opcode
  Examples:

      float4 a;
      a = cast(float4) __simd_ib(XMM.PSRLQ, a, 0x7A);

pure nothrow @nogc @safe void16 `__simd_sto`(XMM `opcode`, void16 `op1`, void16 `op2`);
  For "store" operations of the form: op1 op= op2
  Returns:
  op2 These cannot be marked as pure, as semantic() doesn't check them.
pure nothrow @nogc @safe void16 `__simd_sto`(XMM `opcode`, double `op1`, void16 `op2`);
pure nothrow @nogc @safe void16 `__simd_sto`(XMM `opcode`, float `op1`, void16 `op2`);
  Examples:

      void16 a;
      float f = 1;
      double d = 1;

      cast(void)__simd_sto(XMM.STOUPS, a, a);
      cast(void)__simd_sto(XMM.STOUPS, f, a);
      cast(void)__simd_sto(XMM.STOUPS, d, a);

void `prefetch`(bool writeFetch, ubyte locality)(const(void)* `address`);
  Emit prefetch instruction.
  Parameters:

  const(void)* `address` | address to be prefetched
  writeFetch | true for write fetch, false for read fetch
  locality | 0..3 (0 meaning least local, 3 meaning most local)

  Note The Intel mappings are:

  writeFetch | locality | Instruction
  --- | --- | ---
  false | 0 | prefetchnta
  false | 1 | prefetch2
  false | 2 | prefetch1
  false | 3 | prefetch0
  true | 0 | prefetchw
  true | 1 | prefetchw
  true | 2 | prefetchw
  true | 3 | prefetchw

V `loadUnaligned`(V)(const V* `p`)
if (is(V == void16) || is(V == byte16) || is(V == ubyte16) || is(V == short8) || is(V == ushort8) || is(V == int4) || is(V == uint4) || is(V == long2) || is(V == ulong2) || is(V == double2) || is(V == float4));
  Load unaligned vector from address. This is a compiler intrinsic.
  Parameters:

  V* `p` | pointer to vector

  Returns:
  vector
V `storeUnaligned`(V)(V* `p`, V `value`)
if (is(V == void16) || is(V == byte16) || is(V == ubyte16) || is(V == short8) || is(V == ushort8) || is(V == int4) || is(V == uint4) || is(V == long2) || is(V == ulong2) || is(V == double2) || is(V == float4));
  Store vector to unaligned address. This is a compiler intrinsic.
  Parameters:

  V* `p` | pointer to vector
  V `value` | value to store

  Returns:
  value

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