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cmd/compile/internal/s390x: add initial spill support

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This adds some initial support for spilling and reloading registers in
the new ABI for s390x

Update #40724

Change-Id: Icc46a9375454765dea7d03fc4c8f2dbcc87f5f50
Reviewed-on: https://go-review.googlesource.com/c/go/+/719463
Reviewed-by: Vishwanatha HD <vishwanatha.hd@ibm.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Srinivas Pokala
2025-11-11 04:37:44 +01:00
committed by Keith Randall
parent 73b6aa0fec
commit 81242d034c
2 changed files with 33 additions and 0 deletions
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2
src/cmd/compile/internal/s390x/galign.go
View File

@@ -20,4 +20,6 @@ func Init(arch *ssagen.ArchInfo) {
arch.SSAMarkMoves = ssaMarkMoves
arch.SSAGenValue = ssaGenValue
arch.SSAGenBlock = ssaGenBlock
arch.LoadRegResult = loadRegResult
arch.SpillArgReg = spillArgReg
}

31
src/cmd/compile/internal/s390x/ssa.go
View File

@@ -10,6 +10,7 @@ import (
"cmd/compile/internal/base"
"cmd/compile/internal/ir"
"cmd/compile/internal/logopt"
"cmd/compile/internal/objw"
"cmd/compile/internal/ssa"
"cmd/compile/internal/ssagen"
"cmd/compile/internal/types"
@@ -541,6 +542,17 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) {
p.From.Reg = v.Args[0].Reg()
ssagen.AddrAuto(&p.To, v)
case ssa.OpArgIntReg, ssa.OpArgFloatReg:
// The assembler needs to wrap the entry safepoint/stack growth code with spill/unspill
// The loop only runs once.
for _, a := range v.Block.Func.RegArgs {
// Pass the spill/unspill information along to the assembler, offset by size of
// the saved LR slot.
addr := ssagen.SpillSlotAddr(a, s390x.REGSP, base.Ctxt.Arch.FixedFrameSize)
s.FuncInfo().AddSpill(
obj.RegSpill{Reg: a.Reg, Addr: addr, Unspill: loadByType(a.Type), Spill: storeByType(a.Type)})
}
v.Block.Func.RegArgs = nil
ssagen.CheckArgReg(v)
case ssa.OpS390XLoweredGetClosurePtr:
// Closure pointer is R12 (already)
@@ -1031,3 +1043,22 @@ func ssaGenBlock(s *ssagen.State, b, next *ssa.Block) {
s.Br(s390x.ABR, succs[1])
}
}
func loadRegResult(s *ssagen.State, f *ssa.Func, t *types.Type, reg int16, n *ir.Name, off int64) *obj.Prog {
p := s.Prog(loadByType(t))
p.From.Type = obj.TYPE_MEM
p.From.Name = obj.NAME_AUTO
p.From.Sym = n.Linksym()
p.From.Offset = n.FrameOffset() + off
p.To.Type = obj.TYPE_REG
p.To.Reg = reg
return p
}
func spillArgReg(pp *objw.Progs, p *obj.Prog, f *ssa.Func, t *types.Type, reg int16, n *ir.Name, off int64) *obj.Prog {
p = pp.Append(p, storeByType(t), obj.TYPE_REG, reg, 0, obj.TYPE_MEM, 0, n.FrameOffset()+off)
p.To.Name = obj.NAME_PARAM
p.To.Sym = n.Linksym()
p.Pos = p.Pos.WithNotStmt()
return p
}