converts.go

     1  // Copyright 2026 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //simdgen:category Numeric conversion
     6  
     7  package spec
     8  
     9  // ConvertToZ converts element values to {zE}. The result has the same number of lanes.
    10  //
    11  //specgen:name ConvertTo{zE}
    12  //specgen:require z={zB}{zN}x{xL} zE!=xE
    13  func ConvertToZ[xE Nums, xW Width, zE Nums, zW Width](x Vec[xE, xW]) (z Vec[zE, zW]) {
    14  	// Architectures are generally significantly more constrained in what they
    15  	// will convert between, but this operation describes the full universe of
    16  	// possible conversions.
    17  	return map1[xE, xW, zE, zW](x, func(x xE) zE { return zE(x) })
    18  }
    19  
    20  // TODO: ExtendLo* and ConvertLo* don't work for scalable conversions because we
    21  // put a literal zL in the name. We could instead just call them XLoToZ and drop
    22  // the number since it's fully implied by the receiver type and the target type.
    23  // Note that it's not necessarily the low *half*; for example,
    24  // Uint8x16.ExtendLo2ToUint64 is the low eighth, but that's implied by going
    25  // from uint8 to uint64 without changing the width.
    26  
    27  // ExtendLoLToZ extends the lowest {zL} vector elements to {zE}.
    28  //
    29  //specgen:name ExtendLo{zL}To{zE}
    30  //specgen:require zB=xB zN>xN
    31  func ExtendLoLToZ[E Ints | Uints, W FixedWidth, zE Ints | Uints](x Vec[E, W]) (z Vec[zE, W]) {
    32  	z = makeVec[zE, W]()
    33  	for i := range z {
    34  		z[i] = zE(x[i])
    35  	}
    36  	return z
    37  }
    38  
    39  // ConvertLoLToZ converts the low-indexed {zL} elements of x to {zE}.
    40  //
    41  //specgen:name ConvertLo{zL}To{zE}
    42  //specgen:require zL<xL
    43  func ConvertLoLToZ[E Nums, W FixedWidth, zE Floats](x Vec[E, W]) (z Vec[zE, W]) {
    44  	panic("not implemented")
    45  }
    46
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