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cmd/internal/obj/arm64: factor out constant classification code 

This will allow for further improvements and deduplication.

Change-Id: I9374fc2d16168ced06f3fcc9e558a9c85e24fd01
Reviewed-on: https://go-review.googlesource.com/c/go/+/650936
Reviewed-by: Fannie Zhang <Fannie.Zhang@arm.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
This commit is contained in:
Joel Sing 2025-02-20 22:53:51 +11:00
parent 535e0daefd
commit 391dde29a3
1 changed files with 56 additions and 51 deletions
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107
src/cmd/internal/obj/arm64/asm7.go
View File

@ -1902,6 +1902,61 @@ func rclass(r int16) int {
return C_GOK
}
// conclass classifies a constant.
func conclass(v int64) int {
if v == 0 {
return C_ZCON
}
if isaddcon(v) {
if v <= 0xFFF {
if isbitcon(uint64(v)) {
return C_ABCON0
}
return C_ADDCON0
}
if isbitcon(uint64(v)) {
return C_ABCON
}
if movcon(v) >= 0 {
return C_AMCON
}
if movcon(^v) >= 0 {
return C_AMCON
}
return C_ADDCON
}
t := movcon(v)
if t >= 0 {
if isbitcon(uint64(v)) {
return C_MBCON
}
return C_MOVCON
}
t = movcon(^v)
if t >= 0 {
if isbitcon(uint64(v)) {
return C_MBCON
}
return C_MOVCON
}
if isbitcon(uint64(v)) {
return C_BITCON
}
if isaddcon2(v) {
return C_ADDCON2
}
if uint64(v) == uint64(uint32(v)) || v == int64(int32(v)) {
return C_LCON
}
return C_VCON
}
// con32class reclassifies the constant of 32-bit instruction. Because the constant type is 32-bit,
// but saved in Offset which type is int64, con32class treats it as uint32 type and reclassifies it.
func (c *ctxt7) con32class(a *obj.Addr) int {
@ -2164,57 +2219,7 @@ func (c *ctxt7) aclass(a *obj.Addr) int {
if a.Reg != 0 && a.Reg != REGZERO {
break
}
v := c.instoffset
if v == 0 {
return C_ZCON
}
if isaddcon(v) {
if v <= 0xFFF {
if isbitcon(uint64(v)) {
return C_ABCON0
}
return C_ADDCON0
}
if isbitcon(uint64(v)) {
return C_ABCON
}
if movcon(v) >= 0 {
return C_AMCON
}
if movcon(^v) >= 0 {
return C_AMCON
}
return C_ADDCON
}
t := movcon(v)
if t >= 0 {
if isbitcon(uint64(v)) {
return C_MBCON
}
return C_MOVCON
}
t = movcon(^v)
if t >= 0 {
if isbitcon(uint64(v)) {
return C_MBCON
}
return C_MOVCON
}
if isbitcon(uint64(v)) {
return C_BITCON
}
if isaddcon2(v) {
return C_ADDCON2
}
if uint64(v) == uint64(uint32(v)) || v == int64(int32(v)) {
return C_LCON
}
return C_VCON
return conclass(c.instoffset)
case obj.NAME_EXTERN, obj.NAME_STATIC:
if a.Sym == nil {