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cmd/compile: implement jump table on loong64

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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>
This commit is contained in:
limeidan 2025-09-19 11:18:13 +08:00 • committed by abner chenc
parent 63cd912083
commit af6999e60d
8 changed files with 72 additions and 14 deletions
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9
src/cmd/internal/obj/loong64/asm.go
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@ -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.