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The same reason why we have operands 3 and 4 for ARRAY_REFs. Ada (I believe it's only ada right now) has types that have their offsets computed at compile-time, so we put gimplified values of this stuff there if it doesn't match what we can trivially compute from the type.
int f(int n) { struct s { struct { int i[n]; } i[n]; int i1[n]; } s1; int i, j; for(i = 0;i<n;i++) for(j=0;j<n;j++) s1.i[i].i[j] = i+j; for(i = 0;i<n;i++) s1.i1[i] = i*2; return s1.i[n/2].i[n/2] + s1.i[n/2]; }
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