gccint: Conditional Expressions

1 
1 12.6.3 Conditional Expressions
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1 A C '?:' expression is converted into an 'if' statement with each branch
1 assigning to the same temporary.  So,
1 
1      a = b ? c : d;
1  becomes
1      if (b == 1)
1        T1 = c;
1      else
1        T1 = d;
1      a = T1;
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1  The GIMPLE level if-conversion pass re-introduces '?:' expression, if
1 appropriate.  It is used to vectorize loops with conditions using vector
1 conditional operations.
1 
1  Note that in GIMPLE, 'if' statements are represented using
1 'GIMPLE_COND', as described below.
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