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cmd/internal/obj/arm64: disable AL and NV for some condition operation instructions

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According to the armv8-a reference manual, conditions AL and NV are not allowed
for instructions CINC, CINV, CNEG, CSET and CSETM. This CL adds this check and
the corresponding test cases.

Change-Id: Icb496b7b13a353f41491f2de4d939a5cd88abb04
Reviewed-on: https://go-review.googlesource.com/c/go/+/317912
Reviewed-by: eric fang <eric.fang@arm.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Trust: eric fang <eric.fang@arm.com>
Run-TryBot: eric fang <eric.fang@arm.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
eric fang 2021-05-07 05:48:18 +00:00
parent 12d383c7c7
commit c925e1546e
2 changed files with 21 additions and 13 deletions
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10
src/cmd/asm/internal/asm/testdata/arm64error.s vendored
View File

@ -52,6 +52,16 @@ TEXT errors(SB),$0
NEGSW R7@>2, R5 // ERROR "unsupported shift operator"
CINC CS, R2, R3, R4 // ERROR "illegal combination"
CSEL LT, R1, R2 // ERROR "illegal combination"
CINC AL, R2, R3 // ERROR "invalid condition"
CINC NV, R2, R3 // ERROR "invalid condition"
CINVW AL, R2, R3 // ERROR "invalid condition"
CINV NV, R2, R3 // ERROR "invalid condition"
CNEG AL, R2, R3 // ERROR "invalid condition"
CNEGW NV, R2, R3 // ERROR "invalid condition"
CSET AL, R2 // ERROR "invalid condition"
CSET NV, R2 // ERROR "invalid condition"
CSETMW AL, R2 // ERROR "invalid condition"
CSETM NV, R2 // ERROR "invalid condition"
LDP.P 8(R2), (R2, R3) // ERROR "constrained unpredictable behavior"
LDP.W 8(R3), (R2, R3) // ERROR "constrained unpredictable behavior"
LDP (R1), (R2, R2) // ERROR "constrained unpredictable behavior"

24
src/cmd/internal/obj/arm64/asm7.go
View File

@ -3536,27 +3536,25 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
o1 = c.oprrr(p, p.As)
cond := int(p.From.Reg)
if cond < COND_EQ || cond > COND_NV {
// AL and NV are not allowed for CINC/CINV/CNEG/CSET/CSETM instructions
if cond < COND_EQ || cond > COND_NV || (cond == COND_AL || cond == COND_NV) && p.From3Type() == obj.TYPE_NONE {
c.ctxt.Diag("invalid condition: %v", p)
} else {
cond -= COND_EQ
}
r := int(p.Reg)
var rf int
if r != 0 {
if p.From3Type() == obj.TYPE_NONE {
/* CINC/CINV/CNEG */
rf = r
cond ^= 1
} else {
rf = int(p.GetFrom3().Reg) /* CSEL */
var rf int = r
if p.From3Type() == obj.TYPE_NONE {
/* CINC/CINV/CNEG or CSET/CSETM*/
if r == 0 {
/* CSET/CSETM */
rf = REGZERO
r = rf
}
} else {
/* CSET */
rf = REGZERO
r = rf
cond ^= 1
} else {
rf = int(p.GetFrom3().Reg) /* CSEL */
}
rt := int(p.To.Reg)