[Info-vax] VMS x86-64 compilers

[Mark Daniel]

On 17/11/2023 06:57, Dan Cross wrote:
> In article <tDu5N.98763$YBDd.93660 at fx09.ams4>,
> Mark Daniel  <mark.daniel at wasd.vsm.com.au> wrote:
>> On 17/11/2023 06:20, Dan Cross wrote:
>> [snip]
>>> Why is it doing that?  I'd imagine inline assembler would be the
>>> most likely culprit, but I'm guessing there.  I wonder if you
>>> can get the compiler to emit an assembler listing?
>>
>> Excellent suggestion but unfortunately no.  The compile must quit very
>> early.  The object file has zero content precluding
>> ANA/OBJECT/DISASSEMBLE and while CC/LIST/MACHINE seems to be working
>> with this release the .LIS is similarly empty.
> 
> I'm mildly surprised by this: I'd imagine a compiler invocation
> equivalent to `clang -S` on a Unix-y system would quite before
> object generation; here, you just want to see what instructions
> the compiler would generate without it actually trying to create
> object code.  I wonder if `CC/LIST/MACHINE/NOOBJECT` will do it?

As noted by Craig the notes state /MACHINE still unsupported (does 
generate a very nicely presented source listing though :-)  And no 
object file.

> You definitely ought to be able to get it to generate LLVM byte
> code (which happens well before target instruction selection,
> let alone object code generation) which may give some clues as
> to what's going on.

A little LLVM in the HELP CC and nothing in SYS$HELP:CC.RELEASE_NOTES

CC /ARCHITECTURE
options to pass along to the LLVM code generator to select
CC /OPTIMIZE
options to pass along to the LLVM code generator to select

> 	- Dan C.

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