https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109592
--- Comment #10 from Jeffrey A. Law ---
Created attachment 55218
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55218&action=edit
(Incomplete) Patch
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109592
--- Comment #9 from Jeffrey A. Law ---
Weird, I don't see the attachment either. I'll extract & upload it again.
WRT costing. fwprop and combine will both query the target rtx costs and will
reject when the target costing model indicates the
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109592
--- Comment #8 from Feng Wang ---
(In reply to Jeffrey A. Law from comment #7)
> Attached is what I cobbled together. It doesn't use magic numbers. But it
> doesn't yet handle zero extensions in the simplify-rtx code. But I think it
> shows t
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109592
--- Comment #7 from Jeffrey A. Law ---
Attached is what I cobbled together. It doesn't use magic numbers. But it
doesn't yet handle zero extensions in the simplify-rtx code. But I think it
shows the overall direction fairly well.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109592
--- Comment #6 from Jeffrey A. Law ---
I would still rather not introduce special cases for SUBREGs if we can avoid
it. I think the question remains whether or not patching simplify-rtx's
canonicalize_shift is sufficient to fix this problem (pe
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109592
--- Comment #5 from Feng Wang ---
I found something interesting, these operations such as
zero_extend,sign_extend,zero_extract,sign_extract will be considered as
compound operation and will transform to the approriate shifts and AND
operations(T
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109592
--- Comment #4 from Jeffrey A. Law ---
If we need to handle subregs here, I would suggest something like this
if (SUBREG_P (XEXP (op0, 0))
&& subreg_lowpart_p (op0)
... other tests ...
That way we know we're extracting the low word of
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109592
Richard Biener changed:
What|Removed |Added
Last reconfirmed||2023-04-24
Status|UNCONFIR
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109592
--- Comment #2 from Feng Wang ---
(In reply to Feng Wang from comment #1)
> Hi Jeff,
>
> I have modified some code according to your suggestion.
> In simplify-rtx.cc I add below part in canonicalize_shift:
> if ((code == ASHIFTRT)
>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109592
Feng Wang changed:
What|Removed |Added
CC||wangfeng at eswincomputing dot
com
--- Com
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