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What (who) is single assignment - definition
singleassignment
<programming> A property of variables in a {functional
language}. If a variable is only assigned a value once then
an instance of that variable is thereafter semantically
equivalent to the value. SISAL is an example of a language
with this property.
See also zero assignment.
(2003-12-22)
Static single-assignment form
In compiler design, static singleassignment form (often abbreviated as SSA form or simply SSA) is a property of an intermediate representation (IR), which requires that each variable be assigned exactly once, and every variable be defined before it is used. Existing variables in the original IR are split into versions, new variables typically indicated by the original name with a subscript in textbooks, so that every definition gets its own version.
1. Non–existent before a series of labour market reforms in the 1''0s, temporary and single–assignment contracts now cover more than 35 per cent of all jobs in Spain, against a European average of 12 per cent.