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[Primitives] Fix slice primitives #1139

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[Primitives] Fix slice primitives #1139

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71302db
Fix slice primitives
leonardt Sep 14, 2022
e1b3544
Revert undesired changes
leonardt Sep 14, 2022
52e0e12
Use mlir output
leonardt Sep 14, 2022
e965d3a
Update slice width one logic/test
leonardt Sep 15, 2022
4edeeae
Add gold
leonardt Sep 15, 2022
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11 changes: 7 additions & 4 deletions docs/primitives.md
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Expand Up @@ -249,23 +249,26 @@ Slice function interfaces:
* width: constant slice width


### set_bit
### set_index
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I would be in favor of renaming the function (publicly, i.e. in the docs) to set_bit. We could deprecate set_index for now with warning (doubt anyone is using it anyway...)

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It was changed to set_index because the pattern is more general than just set_bit (i.e. you can use it on generic arrays, rather than just on Bits), so I think it makes more sense to keep it as set_index for generality

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I see. In that case, why do we need a separate function? I.e. why is it not covered by set slice with width 1?

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Simpler to use when you know you're only interested in one index. For the same reasons in Python we have x[1] versus having to do x[1:2].

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Makes sense -- but I would argue x[1] and x[1:2] is the same interface with different arguments (in fact it literally is the function __getitem__).

Maybe we don't need to do this in this change, but seems reasonable to refactor to have the following interface:

"""
* target: Array[N, T]
* value: Union[Array[M, T], T]
* start: UInt[W]

where M < N and W <= clog2(N)
"""
def set(target: Array, value: Union[Type, Array], start: UInt):
    ...

Now that I think about it there are few new concerns here:

  • Should this function work with all Arrays and not just Bits? I kind of assumed it did, but looking at the code closer I'm not certain.
  • Do we need a width argument? Can it just be inferred from value? If value is an array of the same dimensionality as target then it is a slice set; else if it is of dimensionality one less than value then it is an index set (of course assuming the contained types match up and all).
  • In the case start being a constant value, should we optimize for the simple wiring (non-dynamic mux) case?

Similar to set_slice/get_slice, this function allows you to dynamically set the
value of a bit in a Bits value. Here's an example:
value of one index in an Array. Here's an example:

```python
class SetBit(m.Circuit):
io = m.IO(I=m.In(m.Bits[4]),
val=m.In(m.Bit),
idx=m.In(m.Bits[2]),
O=m.Out(m.Bits[4]))
io.O @= m.set_bit(io.I, io.val, io.idx)
io.O @= m.set_index(io.I, io.val, io.idx)
```

Interface:
```python
def set_bit(target: Bits, value: Bit, idx: UInt):
def set_index(target: Array, value, idx: UInt):
"""
Returns a new value where index `idx` of value `target` is set to `value`
* `target` - a value of type `Array[N, T]`
* `value` - a value of type `T`
* `idx` - a value of type `UInt[clog2(N)]`
"""
```
25 changes: 22 additions & 3 deletions magma/primitives/slice.py
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
from typing import Union

from magma.bit import Bit
from magma.bits import Bits, UInt
from magma.bitutils import clog2
Expand Down Expand Up @@ -40,15 +42,32 @@ def slice(*args, **kwargs):
return get_slice(*args, **kwargs)


def set_slice(target: Bits, value: Bits, start: UInt, width: int):
def set_slice(target: Bits, value: Bits, start: Union[UInt, int], width: int):
"""
target: the output with a dynamic slice range replaced by value
value: the output driving a slice of target
start: dynamic start index of the slice
width: constant slice width
"""
if not isinstance(start, UInt):
raise TypeError("start should be a UInt")
if not isinstance(start, (UInt, int)):
raise TypeError("start should be a UInt or int")
if len(target) == 1:
if start != 0:
raise ValueError(
"Start must equal 0 for set_slice with value of length 1")
if width != 1:
raise ValueError(
"Width must equal 1 for set_slice with value of length 1")
if not (
isinstance(value, type(target)) or
isinstance(target, type(value))
):
raise ValueError(
"Incompatible types found for target and value")
return value
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if isinstance(start, int):
start = uint(start)

T = magma_type(type(target))
output = T.qualify(Direction.Undirected)()
orig_start_len = len(start)
Expand Down
296 changes: 296 additions & 0 deletions tests/test_operators/gold/TestSetSliceInt.mlir
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Original file line number Diff line number Diff line change
@@ -0,0 +1,296 @@
hw.module @TestSetSliceInt(%I: i6) -> (O: i12) {
%0 = hw.constant 1 : i1
%1 = hw.constant 0 : i4
%2 = hw.constant 2 : i4
%3 = comb.sub %1, %2 : i4
%4 = comb.extract %3 from 0 : (i4) -> i1
%5 = comb.extract %3 from 1 : (i4) -> i1
%6 = comb.extract %3 from 2 : (i4) -> i1
%7 = hw.constant 0 : i1
%8 = hw.constant 0 : i1
%9 = hw.constant 0 : i1
%10 = comb.concat %9, %8, %7, %6, %5, %4 : i1, i1, i1, i1, i1, i1
%11 = comb.shru %I, %10 : i6
%12 = comb.extract %11 from 0 : (i6) -> i1
%13 = hw.constant 1 : i1
%14 = hw.constant 2 : i4
%15 = hw.constant 0 : i4
%16 = comb.icmp ule %14, %15 : i4
%17 = comb.and %13, %16 : i1
%19 = hw.array_create %12, %0 : i1
%18 = hw.array_get %19[%17] : !hw.array<2xi1>
%20 = hw.constant 1 : i1
%21 = hw.constant 1 : i4
%22 = hw.constant 2 : i4
%23 = comb.sub %21, %22 : i4
%24 = comb.extract %23 from 0 : (i4) -> i1
%25 = comb.extract %23 from 1 : (i4) -> i1
%26 = comb.extract %23 from 2 : (i4) -> i1
%27 = hw.constant 0 : i1
%28 = hw.constant 0 : i1
%29 = hw.constant 0 : i1
%30 = comb.concat %29, %28, %27, %26, %25, %24 : i1, i1, i1, i1, i1, i1
%31 = comb.shru %I, %30 : i6
%32 = comb.extract %31 from 0 : (i6) -> i1
%33 = hw.constant 1 : i1
%34 = hw.constant 2 : i4
%35 = hw.constant 1 : i4
%36 = comb.icmp ule %34, %35 : i4
%37 = comb.and %33, %36 : i1
%38 = hw.constant 2 : i4
%39 = hw.constant 6 : i4
%40 = comb.add %38, %39 : i4
%41 = hw.constant 1 : i4
%42 = comb.sub %40, %41 : i4
%43 = hw.constant 1 : i4
%44 = comb.icmp uge %42, %43 : i4
%45 = comb.and %37, %44 : i1
%47 = hw.array_create %32, %20 : i1
%46 = hw.array_get %47[%45] : !hw.array<2xi1>
%48 = hw.constant 1 : i1
%49 = hw.constant 2 : i4
%50 = hw.constant 2 : i4
%51 = comb.sub %49, %50 : i4
%52 = comb.extract %51 from 0 : (i4) -> i1
%53 = comb.extract %51 from 1 : (i4) -> i1
%54 = comb.extract %51 from 2 : (i4) -> i1
%55 = hw.constant 0 : i1
%56 = hw.constant 0 : i1
%57 = hw.constant 0 : i1
%58 = comb.concat %57, %56, %55, %54, %53, %52 : i1, i1, i1, i1, i1, i1
%59 = comb.shru %I, %58 : i6
%60 = comb.extract %59 from 0 : (i6) -> i1
%61 = hw.constant 1 : i1
%62 = hw.constant 2 : i4
%63 = hw.constant 2 : i4
%64 = comb.icmp ule %62, %63 : i4
%65 = comb.and %61, %64 : i1
%66 = hw.constant 2 : i4
%67 = hw.constant 6 : i4
%68 = comb.add %66, %67 : i4
%69 = hw.constant 1 : i4
%70 = comb.sub %68, %69 : i4
%71 = hw.constant 2 : i4
%72 = comb.icmp uge %70, %71 : i4
%73 = comb.and %65, %72 : i1
%75 = hw.array_create %60, %48 : i1
%74 = hw.array_get %75[%73] : !hw.array<2xi1>
%76 = hw.constant 1 : i1
%77 = hw.constant 3 : i4
%78 = hw.constant 2 : i4
%79 = comb.sub %77, %78 : i4
%80 = comb.extract %79 from 0 : (i4) -> i1
%81 = comb.extract %79 from 1 : (i4) -> i1
%82 = comb.extract %79 from 2 : (i4) -> i1
%83 = hw.constant 0 : i1
%84 = hw.constant 0 : i1
%85 = hw.constant 0 : i1
%86 = comb.concat %85, %84, %83, %82, %81, %80 : i1, i1, i1, i1, i1, i1
%87 = comb.shru %I, %86 : i6
%88 = comb.extract %87 from 0 : (i6) -> i1
%89 = hw.constant 1 : i1
%90 = hw.constant 2 : i4
%91 = hw.constant 6 : i4
%92 = comb.add %90, %91 : i4
%93 = hw.constant 1 : i4
%94 = comb.sub %92, %93 : i4
%95 = hw.constant 3 : i4
%96 = comb.icmp uge %94, %95 : i4
%97 = comb.and %89, %96 : i1
%99 = hw.array_create %88, %76 : i1
%98 = hw.array_get %99[%97] : !hw.array<2xi1>
%100 = hw.constant 1 : i1
%101 = hw.constant 4 : i4
%102 = hw.constant 2 : i4
%103 = comb.sub %101, %102 : i4
%104 = comb.extract %103 from 0 : (i4) -> i1
%105 = comb.extract %103 from 1 : (i4) -> i1
%106 = comb.extract %103 from 2 : (i4) -> i1
%107 = hw.constant 0 : i1
%108 = hw.constant 0 : i1
%109 = hw.constant 0 : i1
%110 = comb.concat %109, %108, %107, %106, %105, %104 : i1, i1, i1, i1, i1, i1
%111 = comb.shru %I, %110 : i6
%112 = comb.extract %111 from 0 : (i6) -> i1
%113 = hw.constant 1 : i1
%114 = hw.constant 2 : i4
%115 = hw.constant 6 : i4
%116 = comb.add %114, %115 : i4
%117 = hw.constant 1 : i4
%118 = comb.sub %116, %117 : i4
%119 = hw.constant 4 : i4
%120 = comb.icmp uge %118, %119 : i4
%121 = comb.and %113, %120 : i1
%123 = hw.array_create %112, %100 : i1
%122 = hw.array_get %123[%121] : !hw.array<2xi1>
%124 = hw.constant 1 : i1
%125 = hw.constant 5 : i4
%126 = hw.constant 2 : i4
%127 = comb.sub %125, %126 : i4
%128 = comb.extract %127 from 0 : (i4) -> i1
%129 = comb.extract %127 from 1 : (i4) -> i1
%130 = comb.extract %127 from 2 : (i4) -> i1
%131 = hw.constant 0 : i1
%132 = hw.constant 0 : i1
%133 = hw.constant 0 : i1
%134 = comb.concat %133, %132, %131, %130, %129, %128 : i1, i1, i1, i1, i1, i1
%135 = comb.shru %I, %134 : i6
%136 = comb.extract %135 from 0 : (i6) -> i1
%137 = hw.constant 1 : i1
%138 = hw.constant 2 : i4
%139 = hw.constant 6 : i4
%140 = comb.add %138, %139 : i4
%141 = hw.constant 1 : i4
%142 = comb.sub %140, %141 : i4
%143 = hw.constant 5 : i4
%144 = comb.icmp uge %142, %143 : i4
%145 = comb.and %137, %144 : i1
%147 = hw.array_create %136, %124 : i1
%146 = hw.array_get %147[%145] : !hw.array<2xi1>
%148 = hw.constant 1 : i1
%149 = hw.constant 6 : i4
%150 = hw.constant 2 : i4
%151 = comb.sub %149, %150 : i4
%152 = comb.extract %151 from 0 : (i4) -> i1
%153 = comb.extract %151 from 1 : (i4) -> i1
%154 = comb.extract %151 from 2 : (i4) -> i1
%155 = hw.constant 0 : i1
%156 = hw.constant 0 : i1
%157 = hw.constant 0 : i1
%158 = comb.concat %157, %156, %155, %154, %153, %152 : i1, i1, i1, i1, i1, i1
%159 = comb.shru %I, %158 : i6
%160 = comb.extract %159 from 0 : (i6) -> i1
%161 = hw.constant 1 : i1
%162 = hw.constant 2 : i4
%163 = hw.constant 6 : i4
%164 = comb.add %162, %163 : i4
%165 = hw.constant 1 : i4
%166 = comb.sub %164, %165 : i4
%167 = hw.constant 6 : i4
%168 = comb.icmp uge %166, %167 : i4
%169 = comb.and %161, %168 : i1
%171 = hw.array_create %160, %148 : i1
%170 = hw.array_get %171[%169] : !hw.array<2xi1>
%172 = hw.constant 1 : i1
%173 = hw.constant 7 : i4
%174 = hw.constant 2 : i4
%175 = comb.sub %173, %174 : i4
%176 = comb.extract %175 from 0 : (i4) -> i1
%177 = comb.extract %175 from 1 : (i4) -> i1
%178 = comb.extract %175 from 2 : (i4) -> i1
%179 = hw.constant 0 : i1
%180 = hw.constant 0 : i1
%181 = hw.constant 0 : i1
%182 = comb.concat %181, %180, %179, %178, %177, %176 : i1, i1, i1, i1, i1, i1
%183 = comb.shru %I, %182 : i6
%184 = comb.extract %183 from 0 : (i6) -> i1
%185 = hw.constant 1 : i1
%186 = hw.constant 2 : i4
%187 = hw.constant 6 : i4
%188 = comb.add %186, %187 : i4
%189 = hw.constant 1 : i4
%190 = comb.sub %188, %189 : i4
%191 = hw.constant 7 : i4
%192 = comb.icmp uge %190, %191 : i4
%193 = comb.and %185, %192 : i1
%195 = hw.array_create %184, %172 : i1
%194 = hw.array_get %195[%193] : !hw.array<2xi1>
%196 = hw.constant 1 : i1
%197 = hw.constant 8 : i4
%198 = hw.constant 2 : i4
%199 = comb.sub %197, %198 : i4
%200 = comb.extract %199 from 0 : (i4) -> i1
%201 = comb.extract %199 from 1 : (i4) -> i1
%202 = comb.extract %199 from 2 : (i4) -> i1
%203 = hw.constant 0 : i1
%204 = hw.constant 0 : i1
%205 = hw.constant 0 : i1
%206 = comb.concat %205, %204, %203, %202, %201, %200 : i1, i1, i1, i1, i1, i1
%207 = comb.shru %I, %206 : i6
%208 = comb.extract %207 from 0 : (i6) -> i1
%209 = hw.constant 1 : i1
%210 = hw.constant 2 : i4
%211 = hw.constant 6 : i4
%212 = comb.add %210, %211 : i4
%213 = hw.constant 1 : i4
%214 = comb.sub %212, %213 : i4
%215 = hw.constant 8 : i4
%216 = comb.icmp uge %214, %215 : i4
%217 = comb.and %209, %216 : i1
%219 = hw.array_create %208, %196 : i1
%218 = hw.array_get %219[%217] : !hw.array<2xi1>
%220 = hw.constant 1 : i1
%221 = hw.constant 9 : i4
%222 = hw.constant 2 : i4
%223 = comb.sub %221, %222 : i4
%224 = comb.extract %223 from 0 : (i4) -> i1
%225 = comb.extract %223 from 1 : (i4) -> i1
%226 = comb.extract %223 from 2 : (i4) -> i1
%227 = hw.constant 0 : i1
%228 = hw.constant 0 : i1
%229 = hw.constant 0 : i1
%230 = comb.concat %229, %228, %227, %226, %225, %224 : i1, i1, i1, i1, i1, i1
%231 = comb.shru %I, %230 : i6
%232 = comb.extract %231 from 0 : (i6) -> i1
%233 = hw.constant 1 : i1
%234 = hw.constant 2 : i4
%235 = hw.constant 6 : i4
%236 = comb.add %234, %235 : i4
%237 = hw.constant 1 : i4
%238 = comb.sub %236, %237 : i4
%239 = hw.constant 9 : i4
%240 = comb.icmp uge %238, %239 : i4
%241 = comb.and %233, %240 : i1
%243 = hw.array_create %232, %220 : i1
%242 = hw.array_get %243[%241] : !hw.array<2xi1>
%244 = hw.constant 1 : i1
%245 = hw.constant 10 : i4
%246 = hw.constant 2 : i4
%247 = comb.sub %245, %246 : i4
%248 = comb.extract %247 from 0 : (i4) -> i1
%249 = comb.extract %247 from 1 : (i4) -> i1
%250 = comb.extract %247 from 2 : (i4) -> i1
%251 = hw.constant 0 : i1
%252 = hw.constant 0 : i1
%253 = hw.constant 0 : i1
%254 = comb.concat %253, %252, %251, %250, %249, %248 : i1, i1, i1, i1, i1, i1
%255 = comb.shru %I, %254 : i6
%256 = comb.extract %255 from 0 : (i6) -> i1
%257 = hw.constant 1 : i1
%258 = hw.constant 2 : i4
%259 = hw.constant 6 : i4
%260 = comb.add %258, %259 : i4
%261 = hw.constant 1 : i4
%262 = comb.sub %260, %261 : i4
%263 = hw.constant 10 : i4
%264 = comb.icmp uge %262, %263 : i4
%265 = comb.and %257, %264 : i1
%267 = hw.array_create %256, %244 : i1
%266 = hw.array_get %267[%265] : !hw.array<2xi1>
%268 = hw.constant 1 : i1
%269 = hw.constant 11 : i4
%270 = hw.constant 2 : i4
%271 = comb.sub %269, %270 : i4
%272 = comb.extract %271 from 0 : (i4) -> i1
%273 = comb.extract %271 from 1 : (i4) -> i1
%274 = comb.extract %271 from 2 : (i4) -> i1
%275 = hw.constant 0 : i1
%276 = hw.constant 0 : i1
%277 = hw.constant 0 : i1
%278 = comb.concat %277, %276, %275, %274, %273, %272 : i1, i1, i1, i1, i1, i1
%279 = comb.shru %I, %278 : i6
%280 = comb.extract %279 from 0 : (i6) -> i1
%281 = hw.constant 1 : i1
%282 = hw.constant 2 : i4
%283 = hw.constant 6 : i4
%284 = comb.add %282, %283 : i4
%285 = hw.constant 1 : i4
%286 = comb.sub %284, %285 : i4
%287 = hw.constant 11 : i4
%288 = comb.icmp uge %286, %287 : i4
%289 = comb.and %281, %288 : i1
%291 = hw.array_create %280, %268 : i1
%290 = hw.array_get %291[%289] : !hw.array<2xi1>
%292 = comb.concat %290, %266, %242, %218, %194, %170, %146, %122, %98, %74, %46, %18 : i1, i1, i1, i1, i1, i1, i1, i1, i1, i1, i1, i1
hw.output %292 : i12
}
3 changes: 3 additions & 0 deletions tests/test_operators/gold/TestSetSliceWidthOne.mlir
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@@ -0,0 +1,3 @@
hw.module @TestSetSliceWidthOne(%I: i1) -> (O: i1) {
hw.output %I : i1
}
10 changes: 10 additions & 0 deletions tests/test_operators/gold/TestSliceInt.mlir
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@@ -0,0 +1,10 @@
hw.module @TestSliceInt(%I: i10) -> (O: i6) {
%0 = comb.extract %I from 2 : (i10) -> i1
%1 = comb.extract %I from 3 : (i10) -> i1
%2 = comb.extract %I from 4 : (i10) -> i1
%3 = comb.extract %I from 5 : (i10) -> i1
%4 = comb.extract %I from 6 : (i10) -> i1
%5 = comb.extract %I from 7 : (i10) -> i1
%6 = comb.concat %5, %4, %3, %2, %1, %0 : i1, i1, i1, i1, i1, i1
hw.output %6 : i6
}
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