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| author | Michał Derkacz <michal@Lnet.pl> | 2020-06-14 00:06:24 +0200 |
|---|---|---|
| committer | Joel Sing <joel@sing.id.au> | 2020-10-28 05:02:44 +0000 |
| commit | 150d2448e5a213cd679396371c0a147918dc2125 (patch) | |
| tree | 7ae047f123b042c4bab3b1ffe27d33dd5c9c959b /src/cmd/compile/internal/ssa/gen/RISCV64.rules | |
| parent | c95bd2e6a99ab06efadb265bf42bbaf8d964904f (diff) | |
| download | go-150d2448e5a213cd679396371c0a147918dc2125.tar.gz go-150d2448e5a213cd679396371c0a147918dc2125.zip | |
cmd/compile,cmd/internal/obj/riscv,runtime: use Duff's devices on riscv64
Implement runtime.duffzero and runtime.duffcopy for riscv64.
Use obj.ADUFFZERO/obj.ADUFFCOPY for medium size, word aligned
zeroing/moving.
Change-Id: I42ec622055630c94cb77e286d8d33dbe7c9f846c
Reviewed-on: https://go-review.googlesource.com/c/go/+/237797
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Diffstat (limited to 'src/cmd/compile/internal/ssa/gen/RISCV64.rules')
| -rw-r--r-- | src/cmd/compile/internal/ssa/gen/RISCV64.rules | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/gen/RISCV64.rules b/src/cmd/compile/internal/ssa/gen/RISCV64.rules index 3bc2e8498a..325cbeb825 100644 --- a/src/cmd/compile/internal/ssa/gen/RISCV64.rules +++ b/src/cmd/compile/internal/ssa/gen/RISCV64.rules @@ -360,6 +360,13 @@ (Zero [4] ptr mem) => (MOVWstore ptr (MOVWconst) mem) (Zero [8] ptr mem) => (MOVDstore ptr (MOVDconst) mem) +// Medium zeroing uses a Duff's device +// 8 and 128 are magic constants, see runtime/mkduff.go +(Zero [s] {t} ptr mem) + && s%8 == 0 && s >= 16 && s <= 8*128 + && t.Alignment()%8 == 0 && !config.noDuffDevice => + (DUFFZERO [8 * (128 - s/8)] ptr mem) + // Generic zeroing uses a loop (Zero [s] {t} ptr mem) => (LoweredZero [t.Alignment()] @@ -395,6 +402,13 @@ (Move [4] dst src mem) => (MOVWstore dst (MOVWload src mem) mem) (Move [8] dst src mem) => (MOVDstore dst (MOVDload src mem) mem) +// Medium move uses a Duff's device +// 16 and 128 are magic constants, see runtime/mkduff.go +(Move [s] {t} dst src mem) + && s%8 == 0 && s >= 16 && s <= 8*128 && t.Alignment()%8 == 0 + && !config.noDuffDevice && logLargeCopy(v, s) => + (DUFFCOPY [16 * (128 - s/8)] dst src mem) + // Generic move uses a loop (Move [s] {t} dst src mem) && (s <= 16 || logLargeCopy(v, s)) => (LoweredMove [t.Alignment()] |