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cmd/internal/obj/asm64: add support for moving BITCON to RSP

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Constant of BITCON type can be moved into RSP by MOVD or MOVW instructions
directly, this CL enables this format of these two instructions.

For 32-bit ADDWop instructions with constant, rewrite the high 32-bit
to be a repetition of the low 32-bit, just as ANDWop instructions do,
so that we can optimize ADDW $bitcon, Rn, Rt as:
MOVW $bitcon, Rtmp
ADDW Rtmp, Rn, Rt
The original code is:
MOVZ $bitcon_low, Rtmp
MOVK $bitcon_high,Rtmp
ADDW Rtmp, Rn, Rt

Change-Id: I30e71972bcfd6470a8b6e6ffbacaee79d523805a
Reviewed-on: https://go-review.googlesource.com/c/go/+/289649
Trust: eric fang <eric.fang@arm.com>
Run-TryBot: eric fang <eric.fang@arm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: eric fang <eric.fang@arm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
eric fang 2021-02-01 07:47:06 +00:00
parent 726d704c32
commit 355c3a037e
3 changed files with 16 additions and 20 deletions
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3
src/cmd/asm/internal/asm/testdata/arm64.s vendored
View File

@ -364,6 +364,9 @@ TEXT foo(SB), DUPOK|NOSPLIT, $-8
MOVD $1, ZR
MOVD $1, R1
MOVK $1, R1
MOVD $0x1000100010001000, RSP // MOVD $1152939097061330944, RSP // ff8304b2
MOVW $0x10001000, RSP // MOVW $268439552, RSP // ff830432
ADDW $0x10001000, R1 // ADDW $268439552, R1 // fb83043221001b0b
// move a large constant to a Vd.
VMOVS $0x80402010, V11 // VMOVS $2151686160, V11

19
src/cmd/internal/obj/arm64/asm7.go
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@ -404,8 +404,8 @@ var optab = []Optab{
/* MOVs that become MOVK/MOVN/MOVZ/ADD/SUB/OR */
{AMOVW, C_MOVCON, C_NONE, C_NONE, C_REG, 32, 4, 0, 0, 0},
{AMOVD, C_MOVCON, C_NONE, C_NONE, C_REG, 32, 4, 0, 0, 0},
{AMOVW, C_BITCON, C_NONE, C_NONE, C_REG, 32, 4, 0, 0, 0},
{AMOVD, C_BITCON, C_NONE, C_NONE, C_REG, 32, 4, 0, 0, 0},
{AMOVW, C_BITCON, C_NONE, C_NONE, C_RSP, 32, 4, 0, 0, 0},
{AMOVD, C_BITCON, C_NONE, C_NONE, C_RSP, 32, 4, 0, 0, 0},
{AMOVW, C_MOVCON2, C_NONE, C_NONE, C_REG, 12, 8, 0, NOTUSETMP, 0},
{AMOVD, C_MOVCON2, C_NONE, C_NONE, C_REG, 12, 8, 0, NOTUSETMP, 0},
{AMOVD, C_MOVCON3, C_NONE, C_NONE, C_REG, 12, 12, 0, NOTUSETMP, 0},
@ -2060,9 +2060,10 @@ func (c *ctxt7) oplook(p *obj.Prog) *Optab {
}
a1 = a0 + 1
p.From.Class = int8(a1)
// more specific classification of 32-bit integers
if p.From.Type == obj.TYPE_CONST && p.From.Name == obj.NAME_NONE {
if p.As == AMOVW || isADDWop(p.As) {
if p.As == AMOVW || isADDWop(p.As) || isANDWop(p.As) {
// For 32-bit instruction with constant, we need to
// treat its offset value as 32 bits to classify it.
ra0 := c.con32class(&p.From)
// do not break C_ADDCON2 when S bit is set
if (p.As == AADDSW || p.As == ASUBSW) && ra0 == C_ADDCON2 {
@ -2071,16 +2072,8 @@ func (c *ctxt7) oplook(p *obj.Prog) *Optab {
a1 = ra0 + 1
p.From.Class = int8(a1)
}
if isANDWop(p.As) && a0 != C_BITCON {
// For 32-bit logical instruction with constant,
// the BITCON test is special in that it looks at
// the 64-bit which has the high 32-bit as a copy
// of the low 32-bit. We have handled that and
// don't pass it to con32class.
a1 = c.con32class(&p.From) + 1
p.From.Class = int8(a1)
}
if ((p.As == AMOVD) || isANDop(p.As) || isADDop(p.As)) && (a0 == C_LCON || a0 == C_VCON) {
// more specific classification of 64-bit integers
a1 = c.con64class(&p.From) + 1
p.From.Class = int8(a1)
}

14
src/cmd/internal/obj/arm64/obj7.go
View File

@ -314,13 +314,13 @@ func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
}
}
// For 32-bit logical instruction with constant,
// rewrite the high 32-bit to be a repetition of
// the low 32-bit, so that the BITCON test can be
// shared for both 32-bit and 64-bit. 32-bit ops
// will zero the high 32-bit of the destination
// register anyway.
if isANDWop(p.As) && p.From.Type == obj.TYPE_CONST {
// For 32-bit instruction with constant, rewrite
// the high 32-bit to be a repetition of the low
// 32-bit, so that the BITCON test can be shared
// for both 32-bit and 64-bit. 32-bit ops will
// zero the high 32-bit of the destination register
// anyway.
if (isANDWop(p.As) || isADDWop(p.As) || p.As == AMOVW) && p.From.Type == obj.TYPE_CONST {
v := p.From.Offset & 0xffffffff
p.From.Offset = v | v<<32
}