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4 Commits

Author SHA1 Message Date
David Green eecba95067 [ARM] Replace arm vendor with none. NFC 2020-04-22 18:19:35 +01:00
Sam Parker f88000a4b5 [ARM][MVE] Add VHADD and VHSUB patterns 
Add patterns that use a normal, non-wrapping, add and sub nodes along
with an arm vshr imm node.

Differential Revision: https://reviews.llvm.org/D77065
 2020-04-17 07:45:15 +01:00
David Green e9e1daf2b9 [ARM] Remove VHADD patterns 
These instructions do not work quite like I expected them to. They
perform the addition and then shift in a higher precision integer, so do
not match up with the patterns that we added.

For example with s8s, adding 100 and 100 should wrap leaving the shift
to work on a negative number. VHADD will instead do the arithmetic in
higher precision, giving 100 overall. The vhadd gives a "better" result,
but not one that matches up with the input.

I am just removing the patterns here. We might be able to re-add them in
the future by checking for wrap flags or changing bitwidths. But for the
moment just remove them to remove the problem cases.
 2019-12-02 10:38:14 +00:00
Oliver Cruickshank 30dcae0956 [ARM] Generate MVE VHADDs/VHSUBs 
llvm-svn: 368146
 2019-08-07 10:26:57 +00:00