|author||Paul E. Murphy <email@example.com>||Mon Aug 17 16:14:48 2020 -0500|
|committer||Lynn Boger <firstname.lastname@example.org>||Tue Aug 18 21:09:30 2020 +0000|
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 <email@example.com> TryBot-Result: Gobot Gobot <firstname.lastname@example.org> Reviewed-by: Lynn Boger <email@example.com>
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