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cmd/internal/obj/loong64: add FLDX,FSTX,LDX.STX instructions support

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The LDX.{B,BU,H,HU,W,WU,D},STX.{B,H,W,D}, FLDX.{S,D}, FSTX.{S,D} instruction
on Loong64 implements memory access operations using register offset

Go asm syntax:
	MOV{B,BU,H,HU,W,WU,V}	(RJ)(RK), RD
	MOV{B,H,W,V}		RD, (RJ)(RK)
	MOV{F,D}		(RJ)(RK), FD
	MOV{F,D}		FD, (RJ)(RK)

Equivalent platform assembler syntax:
        ldx.{b,bu,h,hu,w,wu,d}	rd, rj, rk
        stx.{b,h,w,d}		rd, rj, rk
        fldx.{s,d}		fd, rj, rk
        fstx.{s,d}		fd, rj, rk

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

Change-Id: Ic7d13bf45dab8342f034b6469465e6337a087144
Reviewed-on: https://go-review.googlesource.com/c/go/+/588215
Reviewed-by: sophie zhao <zhaoxiaolin@loongson.cn>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Qiqi Huang <huangqiqi@loongson.cn>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
Auto-Submit: abner chenc <chenguoqi@loongson.cn>
This commit is contained in:
Guoqi Chen 2024-05-23 13:43:20 +08:00 committed by Gopher Robot
parent 3ae819ad1c
commit f428c7b729
5 changed files with 171 additions and 0 deletions
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23
src/cmd/asm/internal/asm/testdata/loong64enc1.s vendored
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@ -309,3 +309,26 @@ lable2:
FTINTRNEWD F0, F2 // 02c81a01
FTINTRNEVF F0, F2 // 02e41a01
FTINTRNEVD F0, F2 // 02e81a01
// LDX.{B,BU,H,HU,W,WU,D} instructions
MOVB (R14)(R13), R12 // cc350038
MOVBU (R14)(R13), R12 // cc352038
MOVH (R14)(R13), R12 // cc350438
MOVHU (R14)(R13), R12 // cc352438
MOVW (R14)(R13), R12 // cc350838
MOVWU (R14)(R13), R12 // cc352838
MOVV (R14)(R13), R12 // cc350c38
// STX.{B,H,W,D} instructions
MOVB R12, (R14)(R13) // cc351038
MOVH R12, (R14)(R13) // cc351438
MOVW R12, (R14)(R13) // cc351838
MOVV R12, (R14)(R13) // cc351c38
// FLDX.{S,D} instructions
MOVF (R14)(R13), F2 // c2353038
MOVD (R14)(R13), F2 // c2353438
// FSTX.{S,D} instructions
MOVF F2, (R14)(R13) // c2353838
MOVD F2, (R14)(R13) // c2353c38

1
src/cmd/internal/obj/loong64/a.out.go
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@ -218,6 +218,7 @@ const (
C_ZOREG
C_SOREG
C_LOREG
C_ROFF // register offset
C_ADDR
C_TLS_LE
C_TLS_IE

60
src/cmd/internal/obj/loong64/asm.go
View File

@ -293,6 +293,22 @@ var optab = []Optab{
{AAMSWAPW, C_REG, C_NONE, C_NONE, C_ZOREG, C_REG, 66, 4, 0, 0},
{ANOOP, C_NONE, C_NONE, C_NONE, C_NONE, C_NONE, 49, 4, 0, 0},
/* store with extended register offset */
{AMOVB, C_REG, C_NONE, C_NONE, C_ROFF, C_NONE, 20, 4, 0, 0},
{AMOVW, C_REG, C_NONE, C_NONE, C_ROFF, C_NONE, 20, 4, 0, 0},
{AMOVV, C_REG, C_NONE, C_NONE, C_ROFF, C_NONE, 20, 4, 0, 0},
{AMOVF, C_FREG, C_NONE, C_NONE, C_ROFF, C_NONE, 20, 4, 0, 0},
{AMOVD, C_FREG, C_NONE, C_NONE, C_ROFF, C_NONE, 20, 4, 0, 0},
/* load with extended register offset */
{AMOVB, C_ROFF, C_NONE, C_NONE, C_REG, C_NONE, 21, 4, 0, 0},
{AMOVBU, C_ROFF, C_NONE, C_NONE, C_REG, C_NONE, 21, 4, 0, 0},
{AMOVW, C_ROFF, C_NONE, C_NONE, C_REG, C_NONE, 21, 4, 0, 0},
{AMOVWU, C_ROFF, C_NONE, C_NONE, C_REG, C_NONE, 21, 4, 0, 0},
{AMOVV, C_ROFF, C_NONE, C_NONE, C_REG, C_NONE, 21, 4, 0, 0},
{AMOVF, C_ROFF, C_NONE, C_NONE, C_FREG, C_NONE, 21, 4, 0, 0},
{AMOVD, C_ROFF, C_NONE, C_NONE, C_FREG, C_NONE, 21, 4, 0, 0},
{obj.APCALIGN, C_SCON, C_NONE, C_NONE, C_NONE, C_NONE, 0, 0, 0, 0},
{obj.APCDATA, C_LCON, C_NONE, C_NONE, C_LCON, C_NONE, 0, 0, 0, 0},
{obj.APCDATA, C_DCON, C_NONE, C_NONE, C_DCON, C_NONE, 0, 0, 0, 0},
@ -654,6 +670,14 @@ func (c *ctxt0) aclass(a *obj.Addr) int {
return C_LAUTO
case obj.NAME_NONE:
if a.Index != 0 {
if a.Offset != 0 {
return C_GOK
}
// register offset
return C_ROFF
}
c.instoffset = a.Offset
if c.instoffset == 0 {
return C_ZOREG
@ -1474,6 +1498,12 @@ func (c *ctxt0) asmout(p *obj.Prog, o *Optab, out []uint32) {
o1 = OP_IR(c.opir(ALU12IW), uint32(v>>12), uint32(p.To.Reg))
o2 = OP_12IRR(c.opirr(AOR), uint32(v), uint32(p.To.Reg), uint32(p.To.Reg))
case 20: // mov Rsrc, (Rbase)(Roff)
o1 = OP_RRR(c.oprrr(p.As), uint32(p.To.Index), uint32(p.To.Reg), uint32(p.From.Reg))
case 21: // mov (Rbase)(Roff), Rdst
o1 = OP_RRR(c.oprrr(-p.As), uint32(p.From.Index), uint32(p.From.Reg), uint32(p.To.Reg))
case 23: // add $lcon,r1,r2
v := c.regoff(&p.From)
o1 = OP_IR(c.opir(ALU12IW), uint32(v>>12), uint32(REGTMP))
@ -1916,6 +1946,36 @@ func (c *ctxt0) oprrr(a obj.As) uint32 {
return 0x225 << 15 // fcopysign.s
case AFCOPYSGD:
return 0x226 << 15 // fcopysign.d
case -AMOVB:
return 0x07000 << 15 // ldx.b
case -AMOVH:
return 0x07008 << 15 // ldx.h
case -AMOVW:
return 0x07010 << 15 // ldx.w
case -AMOVV:
return 0x07018 << 15 // ldx.d
case -AMOVBU:
return 0x07040 << 15 // ldx.bu
case -AMOVHU:
return 0x07048 << 15 // ldx.hu
case -AMOVWU:
return 0x07050 << 15 // ldx.wu
case AMOVB:
return 0x07020 << 15 // stx.b
case AMOVH:
return 0x07028 << 15 // stx.h
case AMOVW:
return 0x07030 << 15 // stx.w
case AMOVV:
return 0x07038 << 15 // stx.d
case -AMOVF:
return 0x07060 << 15 // fldx.s
case -AMOVD:
return 0x07068 << 15 // fldx.d
case AMOVF:
return 0x07070 << 15 // fstx.s
case AMOVD:
return 0x07078 << 15 // fstx.d
}
if a < 0 {

1
src/cmd/internal/obj/loong64/cnames.go
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@ -30,6 +30,7 @@ var cnames0 = []string{
"ZOREG",
"SOREG",
"LOREG",
"ROFF",
"ADDR",
"TLS_LE",
"TLS_IE",

86
src/cmd/internal/obj/loong64/doc.go Normal file
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@ -0,0 +1,86 @@
// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
Package loong64 implements an LoongArch64 assembler. Go assembly syntax is different from
GNU LoongArch64 syntax, but we can still follow the general rules to map between them.
# Instructions mnemonics mapping rules
1. Bit widths represented by various instruction suffixes
V (vlong) = 64 bit
WU (word) = 32 bit unsigned
W (word) = 32 bit
H (half word) = 16 bit
HU = 16 bit unsigned
B (byte) = 8 bit
BU = 8 bit unsigned
F (float) = 32 bit float
D (double) = 64 bit float
2. Align directive
Go asm supports the PCALIGN directive, which indicates that the next instruction should
be aligned to a specified boundary by padding with NOOP instruction. The alignment value
supported on loong64 must be a power of 2 and in the range of [8, 2048].
Examples:
PCALIGN $16
MOVV $2, R4 // This instruction is aligned with 16 bytes.
PCALIGN $1024
MOVV $3, R5 // This instruction is aligned with 1024 bytes.
# On loong64, auto-align loop heads to 16-byte boundaries
Examples:
TEXT ·Add(SB),NOSPLIT|NOFRAME,$0
start:
MOVV $1, R4 // This instruction is aligned with 16 bytes.
MOVV $-1, R5
BNE R5, start
RET
# Register mapping rules
1. All generial-prupose register names are written as Rn.
2. All floating-poing register names are written as Fn.
# Argument mapping rules
1. The operands appear in left-to-right assignment order.
Go reverses the arguments of most instructions.
Examples:
ADDV R11, R12, R13 <=> add.d R13, R12, R11
LLV (R4), R7 <=> ll.d R7, R4
OR R5, R6 <=> or R6, R6, R5
Special Cases.
Argument order is the same as in the GNU Loong64 syntax: jump instructions,
Examples:
BEQ R0, R4, lable1 <=> beq R0, R4, lable1
JMP lable1 <=> b lable1
2. Expressions for special arguments.
Memory references: a base register and an offset register is written as (Rbase)(Roff).
Examples:
MOVB (R4)(R5), R6 <=> ldx.b R6, R4, R5
MOVV (R4)(R5), R6 <=> ldx.d R6, R4, R5
MOVD (R4)(R5), F6 <=> fldx.d F6, R4, R5
MOVB R6, (R4)(R5) <=> stx.b R6, R5, R5
MOVV R6, (R4)(R5) <=> stx.d R6, R5, R5
MOVV F6, (R4)(R5) <=> fstx.d F6, R5, R5
*/
package loong64