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SDBG is the Silverfrost symbolic debugger, and it may be used either by itself or from the Plato Editor/IDE. I have found it to be a well-designed, efficient tool for debugging programs compiled using ...

Compaq Fortran does not emit SSE2 code; only X87 instructions are used for floating point arithmetic. If FTN95 was used only to generate 32-bit code in both check and release modes, the resulting prog ...

BTW, the RO's two pages of assembler text is not the elegant one line call but two pages of totally incomprehensible nonsense for all 100% fortraners minus a few. You do "fasm upcase.asm" an ...

call upcase@ (text)
Yes; instead of
call upcase(text)
for R.O.'s AVX routine. Since FTN95 does not support opening a file with ACCESS='STREAM', you would have to read/convert/write ...

I looked at array sections in scrch1 and found:

v (:mp1, j) = v (:mp1, jcol) ! opt fails
v (1:mp1, j) = v (1:mp1, jcol) ! opt fails
v (:, j) ...

It is easy to draw incorrect conclusions from such benchmarks. In particular, did all the results come from PCs that were identical in all respects (including air temperature, fan speed, etc.) except ...

mecej4,
I thought Lahey applied 80 bit precision to constants.There are a number of options to control (in a non-standard-conforming way, naturally) the interpretation of real constants in Fortran so ...

Thank you!

Correction:

The temporary "fix" is to use /inhibit_opt 40.

It turns out that number 1 cuts out a whole raft of optimisations.
Thanks, Paul, that works!

Is the number specified afte ...

MAP...END MAP is something that I could not find a proper description of in the FTN95 documentation. I ended up consulting the Digital/Compaq Visual Fortran Language Reference Manual, http://jp.xlsoft ...

UNION is an (obsolete) non-standard extension to Fortran 77, and not needed in Fortran 95.

The following code runs, but I am not sure what you wanted to do.
program OBSOLETE
implicit non ...

Paul, I am uneasy about drawing conclusions from the timings alone. The test code does not have any of the bugs that /checkmate would have caught. Therefore, if the compiled code simply skipped doing ...

Incidentally, Eddie, I was also brought up with "subexpression optimisation" in my blood. More recently, I have been weaning myself from that habit, because (i) it makes the code less readab ...

John C., there were at least three Lahey Fortran 77 compilers that I used in the past:

1. LFP77 ("personal"); small memory model (64 K code, 64 K data)

2. LF77; 20-bit address ra ...

Paul, where can we see a list of these "optimisation item"s? How many of these are there, and are they grouped into categories?