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cmd/internal/obj/loong64: simplify buildop

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The length of array optab is readily available, remove the sentinel and
sentinel scan, like arm64.

Change-Id: Iceeed22587ce2beeedeb5babdde3474e75d70f89
Reviewed-on: https://go-review.googlesource.com/c/go/+/699095
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
This commit is contained in:
Xiaolin Zhao 2025-08-26 16:25:21 +08:00 • committed by abner chenc
parent 765905e3bd
commit 6b837a64db
1 changed files with 16 additions and 22 deletions
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38
src/cmd/internal/obj/loong64/asm.go
View file

@ -438,8 +438,6 @@ var optab = []Optab{
{obj.ANOP, C_FREG, C_NONE, C_NONE, C_NONE, C_NONE, 0, 0, 0, 0},
{obj.ADUFFZERO, C_NONE, C_NONE, C_NONE, C_BRAN, C_NONE, 11, 4, 0, 0}, // same as AJMP
{obj.ADUFFCOPY, C_NONE, C_NONE, C_NONE, C_BRAN, C_NONE, 11, 4, 0, 0}, // same as AJMP
{obj.AXXX, C_NONE, C_NONE, C_NONE, C_NONE, C_NONE, 0, 4, 0, 0},
}
var atomicInst = map[obj.As]uint32{
@ -1303,31 +1301,27 @@ func buildop(ctxt *obj.Link) {
return
}
var n int
for i := 0; i < C_NCLASS; i++ {
for n = 0; n < C_NCLASS; n++ {
if cmp(n, i) {
xcmp[i][n] = true
for i := range C_NCLASS {
for j := range C_NCLASS {
if cmp(j, i) {
xcmp[i][j] = true
}
}
}
for n = 0; optab[n].as != obj.AXXX; n++ {
}
slices.SortFunc(optab[:n], ocmp)
for i := 0; i < n; i++ {
r := optab[i].as
r0 := r & obj.AMask
start := i
for optab[i].as == r {
i++
}
oprange[r0] = optab[start:i]
i--
switch r {
slices.SortFunc(optab, ocmp)
for i := 0; i < len(optab); i++ {
as, start := optab[i].as, i
for ; i < len(optab)-1; i++ {
if optab[i+1].as != as {
break
}
}
r0 := as & obj.AMask
oprange[r0] = optab[start : i+1]
switch as {
default:
ctxt.Diag("unknown op in build: %v", r)
ctxt.Diag("unknown op in build: %v", as)
ctxt.DiagFlush()
log.Fatalf("bad code")