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cmd/internal/obj/mips: add WSBH/DSBH/DSHD instructions 

Add support for WSBH/DSBH/DSHD instructions, which are introduced in mips{32,64}r2.

WSBH reverse bytes within halfwords for 32-bit word, DSBH reverse bytes within halfwords for 64-bit doubleword, and DSHD reverse halfwords within doublewords. These instructions can be used to optimize byte swaps.

Ref: The MIPS64 Instruction Set, Revision 5.04: https://s3-eu-west-1.amazonaws.com/downloads-mips/documents/MD00087-2B-MIPS64BIS-AFP-05.04.pdf

Updates #60072

Change-Id: I31c043150fe8ac03027f413ef4cb2f3e435775e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/493816
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
This commit is contained in:
Junxian Zhu 2023-05-09 19:11:20 +08:00 committed by Joel Sing
parent 431612eacb
commit 83c4e533bc
5 changed files with 28 additions and 0 deletions
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1
src/cmd/asm/internal/asm/testdata/mips.s vendored
View File

@ -428,6 +428,7 @@ label4:
NEGW R1, R2 // 00011023
CLZ R1, R2 // 70221020
CLO R1, R2 // 70221021
WSBH R1, R2 // 7c0110a0
// to (Hi, Lo)
MADD R2, R1 // 70220000

5
src/cmd/asm/internal/asm/testdata/mips64.s vendored
View File

@ -587,8 +587,13 @@ label4:
CALL foo(SB)
RET foo(SB)
// unary operation
NEGW R1, R2 // 00011023
NEGV R1, R2 // 0001102f
WSBH R1, R2 // 7c0110a0
DSBH R1, R2 // 7c0110a4
DSHD R1, R2 // 7c011164
RET
// MSA VMOVI

3
src/cmd/internal/obj/mips/a.out.go
View File

@ -415,6 +415,7 @@ const (
ATLBWR
ATNE
AWORD
AWSBH
AXOR
/* 64-bit */
@ -434,6 +435,8 @@ const (
AADDVU
ASUBV
ASUBVU
ADSBH
ADSHD
/* 64-bit FP */
ATRUNCFV

3
src/cmd/internal/obj/mips/anames.go
View File

@ -103,6 +103,7 @@ var Anames = []string{
"TLBWR",
"TNE",
"WORD",
"WSBH",
"XOR",
"MOVV",
"MOVVL",
@ -120,6 +121,8 @@ var Anames = []string{
"ADDVU",
"SUBV",
"SUBVU",
"DSBH",
"DSHD",
"TRUNCFV",
"TRUNCDV",
"TRUNCFW",

16
src/cmd/internal/obj/mips/asm0.go
View File

@ -382,6 +382,9 @@ var optab = []Optab{
{AVMOVB, C_SOREG, C_NONE, C_WREG, 57, 4, 0, sys.MIPS64, 0},
{AVMOVB, C_WREG, C_NONE, C_SOREG, 58, 4, 0, sys.MIPS64, 0},
{AWSBH, C_REG, C_NONE, C_REG, 59, 4, 0, 0, 0},
{ADSBH, C_REG, C_NONE, C_REG, 59, 4, 0, sys.MIPS64, 0},
{ABREAK, C_REG, C_NONE, C_SEXT, 7, 4, REGSB, sys.MIPS64, 0}, /* really CACHE instruction */
{ABREAK, C_REG, C_NONE, C_SAUTO, 7, 4, REGSP, sys.MIPS64, 0},
{ABREAK, C_REG, C_NONE, C_SOREG, 7, 4, REGZERO, sys.MIPS64, 0},
@ -1081,6 +1084,7 @@ func buildop(ctxt *obj.Link) {
ANEGW,
ANEGV,
AWORD,
AWSBH,
obj.ANOP,
obj.ATEXT,
obj.AUNDEF,
@ -1101,6 +1105,9 @@ func buildop(ctxt *obj.Link) {
case ATEQ:
opset(ATNE, r0)
case ADSBH:
opset(ADSHD, r0)
}
}
}
@ -1683,6 +1690,9 @@ func (c *ctxt0) asmout(p *obj.Prog, o *Optab, out []uint32) {
case 58: /* vst wr, $soreg */
v := c.lsoffset(p.As, c.regoff(&p.To))
o1 = OP_VMI10(v, uint32(p.To.Reg), uint32(p.From.Reg), 9, c.twobitdf(p.As))
case 59:
o1 = OP_RRR(c.oprrr(p.As), p.From.Reg, REGZERO, p.To.Reg)
}
out[0] = o1
@ -1883,6 +1893,12 @@ func (c *ctxt0) oprrr(a obj.As) uint32 {
return SP(3, 4) | OP(0, 0)
case AMSUB:
return SP(3, 4) | OP(0, 4)
case AWSBH:
return SP(3, 7) | OP(20, 0)
case ADSBH:
return SP(3, 7) | OP(20, 4)
case ADSHD:
return SP(3, 7) | OP(44, 4)
}
if a < 0 {