Am 20.02.20 um 21:25 schrieb J. Gareth Moreton:
On 20/02/2020 17:10, Florian Klämpfl wrote:
Am 18.02.20 um 23:04 schrieb J. Gareth Moreton:
...
It seems that not all regressions are caught when you run the test
suite conventionally, and you have to specify additional options like
"-O4", which may cause other failures to occur if a test is not
expecting any kind of intense optimisation, for example. In
response, over here at https://bugs.freepascal.org/view.php?id=36687,
I've introduced two new tests that are copies of the ones that
failed, but which explicitly add -O4 to the default compiler
options. Besides covering the fault in my patch, I can see these
tests proving useful later on because I can see future peephole
optimisations in the compiled assembly language (e.g. the following
triplet appears... "movw $65280,%ax; cmp $65280,%ax; je @lbl"...
logical analysis shows that the conditional branch is always taken).
Yes, but in this case, there is something missed at the node level
optimizer. Such code should not be generated.
it might be an artefact of "-Oonoconstprop",
Then the peephole optimizer should care even less about it.
but if you run all of the
"test/cg/tcnvint3" tests with the "-a" option, you will notice such
sequences in some of the ".s" file.
With full -O3?
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