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cmd/internal/obj/loong64: add support for instructions BSTRPICK.{W/D} and BSTRINS.{W/D}

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Go asm syntax:
	BSTRPICK{W/V}	$msb, RJ, $lsb, RD
	BSTRINS{W/V}	$msb, RJ, $lsb, RD

Equivalent platform assembler syntax:
	bstrpick.{w/d}	rd, rj, $msb, $lsb
	bstrins.{w/d}	rd, rj, $msb, $lsb

Ref: https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html

Change-Id: I8b89b766ed22a96da7d8d5b2b2873382a49208de
Reviewed-on: https://go-review.googlesource.com/c/go/+/604735
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
This commit is contained in:
Xiaolin Zhao 2024-08-12 15:18:45 +08:00 • committed by abner chenc
parent 10ed134afe
commit ea08952aa2
6 changed files with 92 additions and 1 deletions
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52
src/cmd/internal/obj/loong64/asm.go
View file

@ -217,6 +217,10 @@ var optab = []Optab{
{ASLLV, C_SCON, C_REG, C_NONE, C_REG, C_NONE, 16, 4, 0, 0},
{ASLLV, C_SCON, C_NONE, C_NONE, C_REG, C_NONE, 16, 4, 0, 0},
{ABSTRPICKW, C_SCON, C_REG, C_SCON, C_REG, C_NONE, 17, 4, 0, 0},
{ABSTRPICKW, C_SCON, C_REG, C_ZCON, C_REG, C_NONE, 17, 4, 0, 0},
{ABSTRPICKW, C_ZCON, C_REG, C_ZCON, C_REG, C_NONE, 17, 4, 0, 0},
{ASYSCALL, C_NONE, C_NONE, C_NONE, C_NONE, C_NONE, 5, 4, 0, 0},
{ASYSCALL, C_ANDCON, C_NONE, C_NONE, C_NONE, C_NONE, 5, 4, 0, 0},
@ -1159,6 +1163,11 @@ func buildop(ctxt *obj.Link) {
opset(ASRLV, r0)
opset(AROTRV, r0)
case ABSTRPICKW:
opset(ABSTRPICKV, r0)
opset(ABSTRINSW, r0)
opset(ABSTRINSV, r0)
case ASUB:
opset(ASUBU, r0)
opset(ANOR, r0)
@ -1265,6 +1274,14 @@ func OP_15I(op uint32, i uint32) uint32 {
return op | (i&0x7FFF)<<0
}
// i1 -> msb
// r2 -> rj
// i3 -> lsb
// r4 -> rd
func OP_IRIR(op uint32, i1 uint32, r2 uint32, i3 uint32, r4 uint32) uint32 {
return op | (i1 << 16) | (r2&0x1F)<<5 | (i3 << 10) | (r4&0x1F)<<0
}
// Encoding for the 'b' or 'bl' instruction.
func OP_B_BL(op uint32, i uint32) uint32 {
return op | ((i & 0xFFFF) << 10) | ((i >> 16) & 0x3FF)
@ -1478,6 +1495,26 @@ func (c *ctxt0) asmout(p *obj.Prog, o *Optab, out []uint32) {
o1 = OP_16IRR(c.opirr(p.As), uint32(v)&0x1f, uint32(r), uint32(p.To.Reg))
}
case 17: // bstrpickw $msbw, r1, $lsbw, r2
rd, rj := p.To.Reg, p.Reg
if rj == obj.REG_NONE {
rj = rd
}
msb, lsb := p.From.Offset, p.GetFrom3().Offset
// check the range of msb and lsb
var b uint32
if p.As == ABSTRPICKW || p.As == ABSTRINSW {
b = 32
} else {
b = 64
}
if lsb < 0 || uint32(lsb) >= b || msb < 0 || uint32(msb) >= b || uint32(lsb) > uint32(msb) {
c.ctxt.Diag("illegal bit number\n%v", p)
}
o1 = OP_IRIR(c.opirir(p.As), uint32(msb), uint32(rj), uint32(lsb), uint32(rd))
case 18: // jmp [r1],0(r2)
r := int(p.Reg)
if r == 0 {
@ -2250,6 +2287,21 @@ func (c *ctxt0) opirr(a obj.As) uint32 {
return 0
}
func (c *ctxt0) opirir(a obj.As) uint32 {
switch a {
case ABSTRINSW:
return 0x3<<21 | 0x0<<15 // bstrins.w
case ABSTRINSV:
return 0x2 << 22 // bstrins.d
case ABSTRPICKW:
return 0x3<<21 | 0x1<<15 // bstrpick.w
case ABSTRPICKV:
return 0x3 << 22 // bstrpick.d
}
return 0
}
func (c *ctxt0) specailFpMovInst(a obj.As, fclass int, tclass int) uint32 {
switch a {
case AMOVV: