| commit | e7c7ce646f37b260fe5a5635bc52243d28125dd8 | [log] [tgz] |
|---|---|---|
| author | Paul E. Murphy <murp@ibm.com> | Mon Aug 17 16:14:48 2020 -0500 |
| committer | Lynn Boger <laboger@linux.vnet.ibm.com> | Tue Aug 18 21:09:30 2020 +0000 |
| tree | 78b97934e94c41896615e8c74d30ecf4f619a182 | |
| parent | 216714e44f703470f102cf248f7e9097160093d4 [diff] |
cmd/compile: combine multiply/add into maddld on ppc64le/power9 Add a new lowering rule to match and replace such instances with the MADDLD instruction available on power9 where possible. Likewise, this plumbs in a new ppc64 ssa opcode to house the newly generated MADDLD instructions. When testing ed25519, this reduced binary size by 936B. Similarly, MADDLD combination occcurs in a few other less obvious cases such as division by constant. Testing of golang.org/x/crypto/ed25519 shows non-trivial speedup during keygeneration: name old time/op new time/op delta KeyGeneration 65.2µs ± 0% 63.1µs ± 0% -3.19% Signing 64.3µs ± 0% 64.4µs ± 0% +0.16% Verification 147µs ± 0% 147µs ± 0% +0.11% Similarly, this test binary has shrunk by 66488B. Change-Id: I077aeda7943119b41f07e4e62e44a648f16e4ad0 Reviewed-on: https://go-review.googlesource.com/c/go/+/248723 Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
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