Precedence Problem

[Intel_C_Intel]

I'm using CVF 6.6C - I know what the problem is, and I know how to fix it. I just don't get how the compiler parses the following:

y(1) = mol_out * stream(flue_gas).multi_air.oxygen
y(2) = mol_out * stream(flue_gas).multi_air.CO2
y(3) = mol_out * stream(flue_gas).multi_air.SO2
y(4) = mol_out * stream(flue_gas).multi_air.NO2
y(5) = mol_out * stream(flue_gas).multi_air.HC_STEAM / 2.
y(6) = ash_flow * stream(clinker).fuelgas.oxygen / MW_O2
y(7) = ash_flow * stream(clinker).fuelgas.moisture / MW_H2O / 2.
y(8) = mol_CaSO4 * 2. ! needs O2 for SO3 => SO4
y(9) = mol_CaO / 2. ! overdoses on CaO

O2_out_bits = y(1) + y(2) + y(3) + y(4) + y(5) + y(6) + y(7) + y(8) + y(9)

O2_out = mol_out * stream(flue_gas).multi_air.oxygen
1    + mol_out * stream(flue_gas).multi_air.CO2
2    + mol_out * stream(flue_gas).multi_air.SO2
3    + mol_out * stream(flue_gas).multi_air.NO2
4    + mol_out * stream(flue_gas).multi_air.HC_STEAM / 2.
5    + ash_flow * stream(clinker).fuelgas.oxygen / MW_O2
6    + ash_flow * stream(clinker).fuelgas.moisture / MW_H2O / 2.
7    + mol_CaSO4 * 2. ! needs O2 for SO3 => SO4
8    + mol_CaO / 2. ! overdoses on CaO

O2_out_bits is correct, O2_out is not. How does the precedence parsing screw up the second example? (i.e., where are the implied parentheses?)

[Steven_L_Intel1]

Replace the dot field separators with %. Does it get it right now? We've had problems with this over the years, and some errors were discovered after CVF development ceased. (Intel Fortran has fixed them.)

[Intel_C_Intel]

Thanks Steve - I remember reading about that problem on here!

Incidently, is it due to the use of 2. instead of 2.D0?

[Steven_L_Intel1]

No. It's specifically due to using dot record field separators. The parser has complex rules for deciding whether this syntax is a field or an operator and sometimes it makes up its mind "too late" and messes up the precedence of other operators. We think that we have nailed all of these down in the current Intel compiler.