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cmd/internal/obj/loong64: add support for FSEL instruction

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Go asm syntax:
	FSEL	FCC, FK, FJ, FD

Equivalent platform assembler syntax:
	fsel	fd, fj, fk, ca

Change-Id: If75f16fca0adfc03f4952f8a5143d22da33ed425
Reviewed-on: https://go-review.googlesource.com/c/go/+/693457
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Mark Freeman <markfreeman@google.com>
This commit is contained in:
Xiaolin Zhao 2025-08-06 11:07:57 +08:00 • committed by abner chenc
parent 1f7ffca171
commit ee7bb8969a
4 changed files with 22 additions and 0 deletions
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14
src/cmd/internal/obj/loong64/asm.go
View file

@ -154,6 +154,9 @@ var optab = []Optab{
{AFMADDF, C_FREG, C_FREG, C_NONE, C_FREG, C_NONE, 37, 4, 0, 0},
{AFMADDF, C_FREG, C_FREG, C_FREG, C_FREG, C_NONE, 37, 4, 0, 0},
{AFSEL, C_FCCREG, C_FREG, C_FREG, C_FREG, C_NONE, 33, 4, 0, 0},
{AFSEL, C_FCCREG, C_FREG, C_NONE, C_FREG, C_NONE, 33, 4, 0, 0},
{AMOVW, C_REG, C_NONE, C_NONE, C_SAUTO, C_NONE, 7, 4, REGSP, 0},
{AMOVWU, C_REG, C_NONE, C_NONE, C_SAUTO, C_NONE, 7, 4, REGSP, 0},
{AMOVV, C_REG, C_NONE, C_NONE, C_SAUTO, C_NONE, 7, 4, REGSP, 0},
@ -1517,6 +1520,7 @@ func buildop(ctxt *obj.Link) {
AWORD,
APRELD,
APRELDX,
AFSEL,
obj.ANOP,
obj.ATEXT,
obj.AFUNCDATA,
@ -2387,6 +2391,16 @@ func (c *ctxt0) asmout(p *obj.Prog, o *Optab, out []uint32) {
}
o1 = OP_6IRR(c.opirr(p.As), uint32(v), uint32(r), uint32(p.To.Reg))
case 33: // fsel ca, fk, [fj], fd
ca := uint32(p.From.Reg)
fk := uint32(p.Reg)
fd := uint32(p.To.Reg)
fj := fd
if len(p.RestArgs) > 0 {
fj = uint32(p.GetFrom3().Reg)
}
o1 = 0x340<<18 | (ca&0x7)<<15 | (fk&0x1F)<<10 | (fj&0x1F)<<5 | (fd & 0x1F)
case 34: // mov $con,fr
v := c.regoff(&p.From)
a := AADDU