| commit | c584f42dcf43351e4cd1e5df22a063f020c00777 | [log] [tgz] |
|---|---|---|
| author | Joel Sing <joel@sing.id.au> | Mon Nov 30 23:47:27 2020 +1100 |
| committer | Joel Sing <joel@sing.id.au> | Tue Feb 23 18:39:53 2021 +0000 |
| tree | 2de9c5e4654cd9a9b8357054fb673caff770006e | |
| parent | 080119799bb9cbace0d20bcc671497a53e3ec14e [diff] |
cmd/compile: change riscv64 Eq32/Neq32 to zero extend before subtraction As done with other equality tests, zero extend before subtraction rather than after (or in this case, at the same time). While at face value this appears to require more instructions, in reality it allows for most sign extensions to be completely eliminated due to correctly typed loads. Existing optimisations (such as subtraction of zero) then become more effective. This removes more than 10,000 instructions from the Go binary and in particular, a writeBarrier check only requires three instructions (AUIPC, LWU, BNEZ) instead of the current four (AUIPC, LWU, NEGW, BNEZ). Change-Id: I7afdc1921c4916ddbd414c3b3f5c2089107ec016 Reviewed-on: https://go-review.googlesource.com/c/go/+/274066 Trust: Joel Sing <joel@sing.id.au> Reviewed-by: Cherry Zhang <cherryyz@google.com> Run-TryBot: Cherry Zhang <cherryyz@google.com>
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