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cmd/internal/obj/arm64: fix an encoding error of CMPW instruction

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For arm64 CMP, ADD and other similar extended register instructions,
if there is no extension, the default extion is LSL<<0, but the default
encoding value (the value of 'option' field) of 32-bit instruction and
64-bit instruction is different, 32-bit is 2 and 64-bit is 3. But the
current assembler incorrectly encodes the value of 32-bit instruction
to 3. This CL fixes this error.

Change-Id: I0e09af2c9c5047a4ed2db7d1183290283db9c31c
Reviewed-on: https://go-review.googlesource.com/c/go/+/329749
Reviewed-by: eric fang <eric.fang@arm.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: eric fang <eric.fang@arm.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
This commit is contained in:
eric fang 2021-06-21 02:11:25 +00:00
parent 4bb0847b08
commit e2e05af6e1
2 changed files with 5 additions and 2 deletions
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3
src/cmd/asm/internal/asm/testdata/arm64.s vendored
View File

@ -89,7 +89,7 @@ TEXT foo(SB), DUPOK|NOSPLIT, $-8
CMP R1<<33, R2
CMP R22.SXTX, RSP // ffe336eb
CMP $0x22220000, RSP // CMP $572653568, RSP // 5b44a4d2ff633beb
CMPW $0x22220000, RSP // CMPW $572653568, RSP // 5b44a452ff633b6b
CMPW $0x22220000, RSP // CMPW $572653568, RSP // 5b44a452ff433b6b
CCMN MI, ZR, R1, $4 // e44341ba
// MADD Rn,Rm,Ra,Rd
MADD R1, R2, R3, R4 // 6408019b
@ -377,6 +377,7 @@ TEXT foo(SB), DUPOK|NOSPLIT, $-8
MOVD $0x1000100010001000, RSP // MOVD $1152939097061330944, RSP // ff8304b2
MOVW $0x10001000, RSP // MOVW $268439552, RSP // ff830432
ADDW $0x10001000, R1 // ADDW $268439552, R1 // fb83043221001b0b
ADDW $0x22220000, RSP, R3 // ADDW $572653568, RSP, R3 // 5b44a452e3433b0b
// move a large constant to a Vd.
VMOVS $0x80402010, V11 // VMOVS $2151686160, V11

4
src/cmd/internal/obj/arm64/asm7.go
View File

@ -4333,8 +4333,10 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
if p.To.Reg == REG_RSP && isADDSop(p.As) {
c.ctxt.Diag("illegal destination register: %v\n", p)
}
lsl0 := LSL0_64
if isADDWop(p.As) || isANDWop(p.As) {
o1 = c.omovconst(AMOVW, p, &p.From, REGTMP)
lsl0 = LSL0_32
} else {
o1 = c.omovconst(AMOVD, p, &p.From, REGTMP)
}
@ -4350,7 +4352,7 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
if p.To.Reg == REGSP || r == REGSP {
o2 = c.opxrrr(p, p.As, false)
o2 |= REGTMP & 31 << 16
o2 |= LSL0_64
o2 |= uint32(lsl0)
} else {
o2 = c.oprrr(p, p.As)
o2 |= REGTMP & 31 << 16 /* shift is 0 */