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cmd/internal/obj/loong64: optimize the code logic of jump instructions 

If p.To.Sym is nil, that means we can get the target offset from
p.To.Target().pc - c.pc，only when p.To.Sym is not nil, we need relocation
to get the true address of target symbol.

Change-Id: Ied52f675c6aa6e8fb8d972b7699f5cadd1ecb268
Reviewed-on: https://go-review.googlesource.com/c/go/+/565627
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: sophie zhao <zhaoxiaolin@loongson.cn>
Reviewed-by: Qiqi Huang <huangqiqi@loongson.cn>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
This commit is contained in:
limeidan 2024-01-17 17:49:37 +08:00 committed by abner chenc
parent 864513dda9
commit 01ab9a016a
1 changed files with 7 additions and 12 deletions
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19
src/cmd/internal/obj/loong64/asm.go
View File

@ -1401,19 +1401,14 @@ func (c *ctxt0) asmout(p *obj.Prog, o *Optab, out []uint32) {
v = int32(p.To.Target().Pc-p.Pc) >> 2
}
o1 = OP_B_BL(c.opirr(p.As), uint32(v))
if p.To.Sym == nil {
if p.As == AJMP {
break
}
p.To.Sym = c.cursym.Func().Text.From.Sym
p.To.Offset = p.To.Target().Pc
if p.To.Sym != nil {
rel := obj.Addrel(c.cursym)
rel.Off = int32(c.pc)
rel.Siz = 4
rel.Sym = p.To.Sym
rel.Add = p.To.Offset
rel.Type = objabi.R_CALLLOONG64
}
rel := obj.Addrel(c.cursym)
rel.Off = int32(c.pc)
rel.Siz = 4
rel.Sym = p.To.Sym
rel.Add = p.To.Offset
rel.Type = objabi.R_CALLLOONG64
case 12: // movbs r,r
// NOTE: this case does not use REGTMP. If it ever does,