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[0/3] amdgcn: Integer multiplication improvements

Message ID cover.1624977771.git.julian@codesourcery.com
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Series amdgcn: Integer multiplication improvements | expand

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Julian Brown June 29, 2021, 2:50 p.m. UTC 
These three patches replace the following one from the previously-posted
series:

  https://gcc.gnu.org/pipermail/gcc-patches/2021-June/573161.html

As suggested by Andrew Stubbs, I've changed the early lowering of DImode
multiplication to a define_insn_and_split to keep the operation together
until register-allocation time.  This indeed seems to improve generated
code.

I also noticed that SImode multiplication can silently clobber SCC if
the "s_mulk_i32" alternative is chosen, so I've done a drive-by fix for
that too.

Re-tested on GCN bare metal.

Julian

Julian Brown (3):
  amdgcn: Mark s_mulk_i32 as clobbering SCC
  amdgcn: Add [us]mulsi3_highpart SGPR alternatives
  amdgcn: Add [us]mulsid3/muldi3 patterns

 gcc/config/gcn/gcn.md | 161 +++++++++++++++++++++++++++++++++++++++---
 1 file changed, 153 insertions(+), 8 deletions(-)