Add SubtractFrom to subtract from a register in place
#1158
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mpharrigan
reviewed
Jul 18, 2024
| def build_composite_bloq(self, bb: 'BloqBuilder', a: Soquet, b: Soquet) -> Dict[str, 'SoquetT']: | ||
| neg = Negate(self.dtype) | ||
| b = bb.add(neg, x=b) # a, -b | ||
| b, a = bb.add_t(Add(self.dtype_as_unsigned, self.dtype_as_unsigned), a=b, b=a) # a - b, -b |
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you can still use bb.add() in these cases
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Yes. My IDE type checker (Pylance) prefers that I use add_t though for the slightly finer grained information.
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Makes sense to me. @tanujkhattar do you have any qualms with this approach? also cc @NoureldinYosri for your inventory of arithmetic bloqs |
anurudhp
reviewed
Jul 19, 2024
Co-authored-by: Anurudh Peduri <7265746+anurudhp@users.noreply.github.com>
anurudhp
approved these changes
Jul 19, 2024
|
this could have been just an extra flag to |
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Add a new version of$|a\rangle|b\rangle \mapsto |a\rangle|a-b\rangle$ , takes it to $|a\rangle|b-a\rangle$ . This is essentially equivalent to the statement
Subtractthat instead of takingb -= a.The implementation uses an additional
Negate, which could likely be improved, but this is a first approach. For now, it only supportsaandbregister of equal dtype.The reason we need this for
Subtractbut not forAddis because addition is commutative and we could always swap the operands, but we can't for subtraction.