[CIL users] ?: with no side-effects

[Elnatan Reisner]

A '?:' expression, when occurring as a standalone statement, gets expanded into an 'if' statement, even if there are no side-effects in either branch. This patch fixes that by simply eliminating the statement altogether, or keeping the condition's side-effects if there were any.

For example,
  x ? 0 : 1;
had been transformed into
  if (x) { }
but, with this patch, is just eliminated.

Also,
  x++ ? 0 : 1;
had been transformed into
  tmp = x;
  x ++;
  if (tmp) { }
and now simply becomes 'x ++;'.

Elnatan

empty_question.c
Description: Binary data

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