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| author | limeidan <limeidan@loongson.cn> | 2025-09-19 11:18:13 +0800 |
|---|---|---|
| committer | abner chenc <chenguoqi@loongson.cn> | 2025-09-27 05:02:58 -0700 |
| commit | af6999e60d498887fceaeca89f4aa88ff35c91df (patch) | |
| tree | f3a76706b883a23539817c53cbc4dab709318705 /src/cmd/internal | |
| parent | 63cd9120836fe935bf39dc9b3a19ad44eab7f063 (diff) | |
| download | go-af6999e60d498887fceaeca89f4aa88ff35c91df.tar.xz | |
cmd/compile: implement jump table on loong64
Following CL 357330, use jump tables on Loong64.
goos: linux
goarch: loong64
pkg: cmd/compile/internal/test
cpu: Loongson-3A6000-HV @ 2500.00MHz
│ old │ new │
│ sec/op │ sec/op vs base │
Switch8Predictable 2.352n ± 0% 2.101n ± 0% -10.65% (p=0.000 n=10)
Switch8Unpredictable 11.99n ± 0% 10.25n ± 0% -14.51% (p=0.000 n=10)
Switch32Predictable 3.153n ± 0% 1.887n ± 1% -40.14% (p=0.000 n=10)
Switch32Unpredictable 12.47n ± 0% 10.22n ± 0% -18.00% (p=0.000 n=10)
SwitchStringPredictable 3.162n ± 0% 3.352n ± 0% +6.01% (p=0.000 n=10)
SwitchStringUnpredictable 14.70n ± 0% 13.31n ± 0% -9.46% (p=0.000 n=10)
SwitchTypePredictable 3.702n ± 0% 2.201n ± 0% -40.55% (p=0.000 n=10)
SwitchTypeUnpredictable 16.18n ± 0% 14.48n ± 0% -10.51% (p=0.000 n=10)
SwitchInterfaceTypePredictable 7.654n ± 0% 9.680n ± 0% +26.47% (p=0.000 n=10)
SwitchInterfaceTypeUnpredictable 22.04n ± 0% 22.44n ± 0% +1.81% (p=0.000 n=10)
geomean 7.441n 6.469n -13.07%
Change-Id: Id6f30fa73349c60fac17670084daee56973a955f
Reviewed-on: https://go-review.googlesource.com/c/go/+/705396
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Diffstat (limited to 'src/cmd/internal')
| -rw-r--r-- | src/cmd/internal/obj/loong64/asm.go | 9 | ||||
| -rw-r--r-- | src/cmd/internal/sys/arch.go | 1 |
2 files changed, 10 insertions, 0 deletions
diff --git a/src/cmd/internal/obj/loong64/asm.go b/src/cmd/internal/obj/loong64/asm.go index e20ceaae95..ca6e2be4aa 100644 --- a/src/cmd/internal/obj/loong64/asm.go +++ b/src/cmd/internal/obj/loong64/asm.go @@ -707,6 +707,15 @@ func span0(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) { // so instruction sequences that use REGTMP are unsafe to // preempt asynchronously. obj.MarkUnsafePoints(c.ctxt, c.cursym.Func().Text, c.newprog, c.isUnsafePoint, c.isRestartable) + + // Now that we know byte offsets, we can generate jump table entries. + for _, jt := range cursym.Func().JumpTables { + for i, p := range jt.Targets { + // The ith jumptable entry points to the p.Pc'th + // byte in the function symbol s. + jt.Sym.WriteAddr(ctxt, int64(i)*8, 8, cursym, p.Pc) + } + } } // isUnsafePoint returns whether p is an unsafe point. diff --git a/src/cmd/internal/sys/arch.go b/src/cmd/internal/sys/arch.go index 484538f28f..3c92a6bbf2 100644 --- a/src/cmd/internal/sys/arch.go +++ b/src/cmd/internal/sys/arch.go @@ -145,6 +145,7 @@ var ArchLoong64 = &Arch{ MinLC: 4, Alignment: 8, // Unaligned accesses are not guaranteed to be fast CanMergeLoads: true, + CanJumpTable: true, HasLR: true, FixedFrameSize: 8, // LR } |