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A C ?:
expression is converted into an if
statement with
each branch assigning to the same temporary. So,
a = b ? c : d;
becomes
if (b) T1 = c; else T1 = d; a = T1;
Tree level if-conversion pass re-introduces ?:
expression, if appropriate.
It is used to vectorize loops with conditions using vector conditional operations.
Note that in GIMPLE, if
statements are also represented using
COND_EXPR
, as described below.