/
asm7.go
4538 lines (3733 loc) · 101 KB
/
asm7.go
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// cmd/7l/asm.c, cmd/7l/asmout.c, cmd/7l/optab.c, cmd/7l/span.c, cmd/ld/sub.c, cmd/ld/mod.c, from Vita Nuova.
// https://code.google.com/p/ken-cc/source/browse/
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package arm64
import (
"cmd/internal/obj"
"cmd/internal/objabi"
"fmt"
"log"
"math"
"sort"
)
// ctxt7 holds state while assembling a single function.
// Each function gets a fresh ctxt7.
// This allows for multiple functions to be safely concurrently assembled.
type ctxt7 struct {
ctxt *obj.Link
newprog obj.ProgAlloc
cursym *obj.LSym
blitrl *obj.Prog
elitrl *obj.Prog
autosize int32
instoffset int64
pc int64
pool struct {
start uint32
size uint32
}
}
const (
funcAlign = 16
)
const (
REGFROM = 1
)
type Optab struct {
as obj.As
a1 uint8
a2 uint8
a3 uint8
type_ int8
size int8
param int16
flag int8
scond uint16
}
var oprange [ALAST & obj.AMask][]Optab
var xcmp [C_NCLASS][C_NCLASS]bool
const (
S32 = 0 << 31
S64 = 1 << 31
Sbit = 1 << 29
LSL0_32 = 2 << 13
LSL0_64 = 3 << 13
)
func OPDP2(x uint32) uint32 {
return 0<<30 | 0<<29 | 0xd6<<21 | x<<10
}
func OPDP3(sf uint32, op54 uint32, op31 uint32, o0 uint32) uint32 {
return sf<<31 | op54<<29 | 0x1B<<24 | op31<<21 | o0<<15
}
func OPBcc(x uint32) uint32 {
return 0x2A<<25 | 0<<24 | 0<<4 | x&15
}
func OPBLR(x uint32) uint32 {
/* x=0, JMP; 1, CALL; 2, RET */
return 0x6B<<25 | 0<<23 | x<<21 | 0x1F<<16 | 0<<10
}
func SYSOP(l uint32, op0 uint32, op1 uint32, crn uint32, crm uint32, op2 uint32, rt uint32) uint32 {
return 0x354<<22 | l<<21 | op0<<19 | op1<<16 | crn&15<<12 | crm&15<<8 | op2<<5 | rt
}
func SYSHINT(x uint32) uint32 {
return SYSOP(0, 0, 3, 2, 0, x, 0x1F)
}
func LDSTR12U(sz uint32, v uint32, opc uint32) uint32 {
return sz<<30 | 7<<27 | v<<26 | 1<<24 | opc<<22
}
func LDSTR9S(sz uint32, v uint32, opc uint32) uint32 {
return sz<<30 | 7<<27 | v<<26 | 0<<24 | opc<<22
}
func LD2STR(o uint32) uint32 {
return o &^ (3 << 22)
}
func LDSTX(sz uint32, o2 uint32, l uint32, o1 uint32, o0 uint32) uint32 {
return sz<<30 | 0x8<<24 | o2<<23 | l<<22 | o1<<21 | o0<<15
}
func FPCMP(m uint32, s uint32, type_ uint32, op uint32, op2 uint32) uint32 {
return m<<31 | s<<29 | 0x1E<<24 | type_<<22 | 1<<21 | op<<14 | 8<<10 | op2
}
func FPCCMP(m uint32, s uint32, type_ uint32, op uint32) uint32 {
return m<<31 | s<<29 | 0x1E<<24 | type_<<22 | 1<<21 | 1<<10 | op<<4
}
func FPOP1S(m uint32, s uint32, type_ uint32, op uint32) uint32 {
return m<<31 | s<<29 | 0x1E<<24 | type_<<22 | 1<<21 | op<<15 | 0x10<<10
}
func FPOP2S(m uint32, s uint32, type_ uint32, op uint32) uint32 {
return m<<31 | s<<29 | 0x1E<<24 | type_<<22 | 1<<21 | op<<12 | 2<<10
}
func FPCVTI(sf uint32, s uint32, type_ uint32, rmode uint32, op uint32) uint32 {
return sf<<31 | s<<29 | 0x1E<<24 | type_<<22 | 1<<21 | rmode<<19 | op<<16 | 0<<10
}
func ADR(p uint32, o uint32, rt uint32) uint32 {
return p<<31 | (o&3)<<29 | 0x10<<24 | ((o>>2)&0x7FFFF)<<5 | rt&31
}
func OPBIT(x uint32) uint32 {
return 1<<30 | 0<<29 | 0xD6<<21 | 0<<16 | x<<10
}
const (
LFROM = 1 << 0
LTO = 1 << 1
)
var optab = []Optab{
/* struct Optab:
OPCODE, from, prog->reg, to, type,size,param,flag,scond */
{obj.ATEXT, C_ADDR, C_NONE, C_TEXTSIZE, 0, 0, 0, 0, 0},
/* arithmetic operations */
{AADD, C_REG, C_REG, C_REG, 1, 4, 0, 0, 0},
{AADD, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0},
{AADC, C_REG, C_REG, C_REG, 1, 4, 0, 0, 0},
{AADC, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0},
{ANEG, C_REG, C_NONE, C_REG, 25, 4, 0, 0, 0},
{ANEG, C_NONE, C_NONE, C_REG, 25, 4, 0, 0, 0},
{ANGC, C_REG, C_NONE, C_REG, 17, 4, 0, 0, 0},
{ACMP, C_REG, C_REG, C_NONE, 1, 4, 0, 0, 0},
{AADD, C_ADDCON, C_RSP, C_RSP, 2, 4, 0, 0, 0},
{AADD, C_ADDCON, C_NONE, C_RSP, 2, 4, 0, 0, 0},
{ACMP, C_ADDCON, C_RSP, C_NONE, 2, 4, 0, 0, 0},
{AADD, C_MOVCON, C_RSP, C_RSP, 62, 8, 0, 0, 0},
{AADD, C_MOVCON, C_NONE, C_RSP, 62, 8, 0, 0, 0},
{ACMP, C_MOVCON, C_RSP, C_NONE, 62, 8, 0, 0, 0},
{AADD, C_BITCON, C_RSP, C_RSP, 62, 8, 0, 0, 0},
{AADD, C_BITCON, C_NONE, C_RSP, 62, 8, 0, 0, 0},
{ACMP, C_BITCON, C_RSP, C_NONE, 62, 8, 0, 0, 0},
{AADD, C_VCON, C_RSP, C_RSP, 13, 8, 0, LFROM, 0},
{AADD, C_VCON, C_NONE, C_RSP, 13, 8, 0, LFROM, 0},
{ACMP, C_VCON, C_REG, C_NONE, 13, 8, 0, LFROM, 0},
{AADD, C_SHIFT, C_REG, C_REG, 3, 4, 0, 0, 0},
{AADD, C_SHIFT, C_NONE, C_REG, 3, 4, 0, 0, 0},
{AMVN, C_SHIFT, C_NONE, C_REG, 3, 4, 0, 0, 0},
{ACMP, C_SHIFT, C_REG, C_NONE, 3, 4, 0, 0, 0},
{ANEG, C_SHIFT, C_NONE, C_REG, 26, 4, 0, 0, 0},
{AADD, C_REG, C_RSP, C_RSP, 27, 4, 0, 0, 0},
{AADD, C_REG, C_NONE, C_RSP, 27, 4, 0, 0, 0},
{ACMP, C_REG, C_RSP, C_NONE, 27, 4, 0, 0, 0},
{AADD, C_EXTREG, C_RSP, C_RSP, 27, 4, 0, 0, 0},
{AADD, C_EXTREG, C_NONE, C_RSP, 27, 4, 0, 0, 0},
{AMVN, C_EXTREG, C_NONE, C_RSP, 27, 4, 0, 0, 0},
{ACMP, C_EXTREG, C_RSP, C_NONE, 27, 4, 0, 0, 0},
{AADD, C_REG, C_REG, C_REG, 1, 4, 0, 0, 0},
{AADD, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0},
/* logical operations */
{AAND, C_REG, C_REG, C_REG, 1, 4, 0, 0, 0},
{AAND, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0},
{ABIC, C_REG, C_REG, C_REG, 1, 4, 0, 0, 0},
{ABIC, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0},
{AAND, C_MBCON, C_REG, C_REG, 53, 4, 0, 0, 0},
{AAND, C_MBCON, C_NONE, C_REG, 53, 4, 0, 0, 0},
{ABIC, C_MBCON, C_REG, C_REG, 53, 4, 0, 0, 0},
{ABIC, C_MBCON, C_NONE, C_REG, 53, 4, 0, 0, 0},
{AAND, C_BITCON, C_REG, C_REG, 53, 4, 0, 0, 0},
{AAND, C_BITCON, C_NONE, C_REG, 53, 4, 0, 0, 0},
{ABIC, C_BITCON, C_REG, C_REG, 53, 4, 0, 0, 0},
{ABIC, C_BITCON, C_NONE, C_REG, 53, 4, 0, 0, 0},
{AAND, C_MOVCON, C_REG, C_REG, 62, 8, 0, 0, 0},
{AAND, C_MOVCON, C_NONE, C_REG, 62, 8, 0, 0, 0},
{ABIC, C_MOVCON, C_REG, C_REG, 62, 8, 0, 0, 0},
{ABIC, C_MOVCON, C_NONE, C_REG, 62, 8, 0, 0, 0},
{AAND, C_VCON, C_REG, C_REG, 28, 8, 0, LFROM, 0},
{AAND, C_VCON, C_NONE, C_REG, 28, 8, 0, LFROM, 0},
{ABIC, C_VCON, C_REG, C_REG, 28, 8, 0, LFROM, 0},
{ABIC, C_VCON, C_NONE, C_REG, 28, 8, 0, LFROM, 0},
{AAND, C_SHIFT, C_REG, C_REG, 3, 4, 0, 0, 0},
{AAND, C_SHIFT, C_NONE, C_REG, 3, 4, 0, 0, 0},
{ABIC, C_SHIFT, C_REG, C_REG, 3, 4, 0, 0, 0},
{ABIC, C_SHIFT, C_NONE, C_REG, 3, 4, 0, 0, 0},
{AMOVD, C_RSP, C_NONE, C_RSP, 24, 4, 0, 0, 0},
{AMVN, C_REG, C_NONE, C_REG, 24, 4, 0, 0, 0},
{AMOVB, C_REG, C_NONE, C_REG, 45, 4, 0, 0, 0},
{AMOVBU, C_REG, C_NONE, C_REG, 45, 4, 0, 0, 0},
{AMOVH, C_REG, C_NONE, C_REG, 45, 4, 0, 0, 0}, /* also MOVHU */
{AMOVW, C_REG, C_NONE, C_REG, 45, 4, 0, 0, 0}, /* also MOVWU */
/* TODO: MVN C_SHIFT */
/* MOVs that become MOVK/MOVN/MOVZ/ADD/SUB/OR */
{AMOVW, C_MOVCON, C_NONE, C_REG, 32, 4, 0, 0, 0},
{AMOVD, C_MOVCON, C_NONE, C_REG, 32, 4, 0, 0, 0},
// TODO: these don't work properly.
// { AMOVW, C_ADDCON, C_NONE, C_REG, 2, 4, 0 , 0},
// { AMOVD, C_ADDCON, C_NONE, C_REG, 2, 4, 0 , 0},
{AMOVW, C_BITCON, C_NONE, C_REG, 32, 4, 0, 0, 0},
{AMOVD, C_BITCON, C_NONE, C_REG, 32, 4, 0, 0, 0},
{AMOVK, C_VCON, C_NONE, C_REG, 33, 4, 0, 0, 0},
{AMOVD, C_AACON, C_NONE, C_REG, 4, 4, REGFROM, 0, 0},
{ASDIV, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0},
{ASDIV, C_REG, C_REG, C_REG, 1, 4, 0, 0, 0},
{AB, C_NONE, C_NONE, C_SBRA, 5, 4, 0, 0, 0},
{ABL, C_NONE, C_NONE, C_SBRA, 5, 4, 0, 0, 0},
{AB, C_NONE, C_NONE, C_ZOREG, 6, 4, 0, 0, 0},
{ABL, C_NONE, C_NONE, C_REG, 6, 4, 0, 0, 0},
{ABL, C_REG, C_NONE, C_REG, 6, 4, 0, 0, 0},
{ABL, C_NONE, C_NONE, C_ZOREG, 6, 4, 0, 0, 0},
{obj.ARET, C_NONE, C_NONE, C_REG, 6, 4, 0, 0, 0},
{obj.ARET, C_NONE, C_NONE, C_ZOREG, 6, 4, 0, 0, 0},
{AADRP, C_SBRA, C_NONE, C_REG, 60, 4, 0, 0, 0},
{AADR, C_SBRA, C_NONE, C_REG, 61, 4, 0, 0, 0},
{ABFM, C_VCON, C_REG, C_REG, 42, 4, 0, 0, 0},
{ABFI, C_VCON, C_REG, C_REG, 43, 4, 0, 0, 0},
{AEXTR, C_VCON, C_REG, C_REG, 44, 4, 0, 0, 0},
{ASXTB, C_REG, C_NONE, C_REG, 45, 4, 0, 0, 0},
{ACLS, C_REG, C_NONE, C_REG, 46, 4, 0, 0, 0},
{ABEQ, C_NONE, C_NONE, C_SBRA, 7, 4, 0, 0, 0},
{ALSL, C_VCON, C_REG, C_REG, 8, 4, 0, 0, 0},
{ALSL, C_VCON, C_NONE, C_REG, 8, 4, 0, 0, 0},
{ALSL, C_REG, C_NONE, C_REG, 9, 4, 0, 0, 0},
{ALSL, C_REG, C_REG, C_REG, 9, 4, 0, 0, 0},
{ASVC, C_NONE, C_NONE, C_VCON, 10, 4, 0, 0, 0},
{ASVC, C_NONE, C_NONE, C_NONE, 10, 4, 0, 0, 0},
{ADWORD, C_NONE, C_NONE, C_VCON, 11, 8, 0, 0, 0},
{ADWORD, C_NONE, C_NONE, C_LEXT, 11, 8, 0, 0, 0},
{ADWORD, C_NONE, C_NONE, C_ADDR, 11, 8, 0, 0, 0},
{ADWORD, C_NONE, C_NONE, C_LACON, 11, 8, 0, 0, 0},
{AWORD, C_NONE, C_NONE, C_LCON, 14, 4, 0, 0, 0},
{AWORD, C_NONE, C_NONE, C_LEXT, 14, 4, 0, 0, 0},
{AWORD, C_NONE, C_NONE, C_ADDR, 14, 4, 0, 0, 0},
{AMOVW, C_VCON, C_NONE, C_REG, 12, 4, 0, LFROM, 0},
{AMOVW, C_VCONADDR, C_NONE, C_REG, 68, 8, 0, 0, 0},
{AMOVD, C_VCON, C_NONE, C_REG, 12, 4, 0, LFROM, 0},
{AMOVD, C_VCONADDR, C_NONE, C_REG, 68, 8, 0, 0, 0},
{AMOVB, C_REG, C_NONE, C_ADDR, 64, 12, 0, 0, 0},
{AMOVBU, C_REG, C_NONE, C_ADDR, 64, 12, 0, 0, 0},
{AMOVH, C_REG, C_NONE, C_ADDR, 64, 12, 0, 0, 0},
{AMOVW, C_REG, C_NONE, C_ADDR, 64, 12, 0, 0, 0},
{AMOVD, C_REG, C_NONE, C_ADDR, 64, 12, 0, 0, 0},
{AMOVB, C_ADDR, C_NONE, C_REG, 65, 12, 0, 0, 0},
{AMOVBU, C_ADDR, C_NONE, C_REG, 65, 12, 0, 0, 0},
{AMOVH, C_ADDR, C_NONE, C_REG, 65, 12, 0, 0, 0},
{AMOVW, C_ADDR, C_NONE, C_REG, 65, 12, 0, 0, 0},
{AMOVD, C_ADDR, C_NONE, C_REG, 65, 12, 0, 0, 0},
{AMOVD, C_GOTADDR, C_NONE, C_REG, 71, 8, 0, 0, 0},
{AMOVD, C_TLS_LE, C_NONE, C_REG, 69, 4, 0, 0, 0},
{AMOVD, C_TLS_IE, C_NONE, C_REG, 70, 8, 0, 0, 0},
{AMUL, C_REG, C_REG, C_REG, 15, 4, 0, 0, 0},
{AMUL, C_REG, C_NONE, C_REG, 15, 4, 0, 0, 0},
{AMADD, C_REG, C_REG, C_REG, 15, 4, 0, 0, 0},
{AREM, C_REG, C_REG, C_REG, 16, 8, 0, 0, 0},
{AREM, C_REG, C_NONE, C_REG, 16, 8, 0, 0, 0},
{ACSEL, C_COND, C_REG, C_REG, 18, 4, 0, 0, 0}, /* from3 optional */
{ACSET, C_COND, C_NONE, C_REG, 18, 4, 0, 0, 0},
{ACCMN, C_COND, C_REG, C_VCON, 19, 4, 0, 0, 0}, /* from3 either C_REG or C_VCON */
/* scaled 12-bit unsigned displacement store */
{AMOVB, C_REG, C_NONE, C_UAUTO4K, 20, 4, REGSP, 0, 0},
{AMOVB, C_REG, C_NONE, C_UOREG4K, 20, 4, 0, 0, 0},
{AMOVBU, C_REG, C_NONE, C_UAUTO4K, 20, 4, REGSP, 0, 0},
{AMOVBU, C_REG, C_NONE, C_UOREG4K, 20, 4, 0, 0, 0},
{AMOVH, C_REG, C_NONE, C_UAUTO8K, 20, 4, REGSP, 0, 0},
{AMOVH, C_REG, C_NONE, C_ZOREG, 20, 4, 0, 0, 0},
{AMOVH, C_REG, C_NONE, C_UOREG8K, 20, 4, 0, 0, 0},
{AMOVW, C_REG, C_NONE, C_UAUTO16K, 20, 4, REGSP, 0, 0},
{AMOVW, C_REG, C_NONE, C_ZOREG, 20, 4, 0, 0, 0},
{AMOVW, C_REG, C_NONE, C_UOREG16K, 20, 4, 0, 0, 0},
/* unscaled 9-bit signed displacement store */
{AMOVB, C_REG, C_NONE, C_NSAUTO, 20, 4, REGSP, 0, 0},
{AMOVB, C_REG, C_NONE, C_NSOREG, 20, 4, 0, 0, 0},
{AMOVBU, C_REG, C_NONE, C_NSAUTO, 20, 4, REGSP, 0, 0},
{AMOVBU, C_REG, C_NONE, C_NSOREG, 20, 4, 0, 0, 0},
{AMOVH, C_REG, C_NONE, C_NSAUTO, 20, 4, REGSP, 0, 0},
{AMOVH, C_REG, C_NONE, C_NSOREG, 20, 4, 0, 0, 0},
{AMOVW, C_REG, C_NONE, C_NSAUTO, 20, 4, REGSP, 0, 0},
{AMOVW, C_REG, C_NONE, C_NSOREG, 20, 4, 0, 0, 0},
{AMOVD, C_REG, C_NONE, C_UAUTO32K, 20, 4, REGSP, 0, 0},
{AMOVD, C_REG, C_NONE, C_ZOREG, 20, 4, 0, 0, 0},
{AMOVD, C_REG, C_NONE, C_UOREG32K, 20, 4, 0, 0, 0},
{AMOVD, C_REG, C_NONE, C_NSOREG, 20, 4, 0, 0, 0},
{AMOVD, C_REG, C_NONE, C_NSAUTO, 20, 4, REGSP, 0, 0},
/* short displacement load */
{AMOVB, C_UAUTO4K, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVB, C_NSAUTO, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVB, C_ZOREG, C_NONE, C_REG, 21, 4, 0, 0, 0},
{AMOVB, C_UOREG4K, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVB, C_NSOREG, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVBU, C_UAUTO4K, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVBU, C_NSAUTO, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVBU, C_ZOREG, C_NONE, C_REG, 21, 4, 0, 0, 0},
{AMOVBU, C_UOREG4K, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVBU, C_NSOREG, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVH, C_UAUTO8K, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVH, C_NSAUTO, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVH, C_ZOREG, C_NONE, C_REG, 21, 4, 0, 0, 0},
{AMOVH, C_UOREG8K, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVH, C_NSOREG, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVW, C_UAUTO16K, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVW, C_NSAUTO, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVW, C_ZOREG, C_NONE, C_REG, 21, 4, 0, 0, 0},
{AMOVW, C_UOREG16K, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVW, C_NSOREG, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVD, C_UAUTO32K, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVD, C_NSAUTO, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVD, C_ZOREG, C_NONE, C_REG, 21, 4, 0, 0, 0},
{AMOVD, C_UOREG32K, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
{AMOVD, C_NSOREG, C_NONE, C_REG, 21, 4, REGSP, 0, 0},
/* long displacement store */
{AMOVB, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0},
{AMOVB, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0},
{AMOVBU, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0},
{AMOVBU, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0},
{AMOVH, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0},
{AMOVH, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0},
{AMOVW, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0},
{AMOVW, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0},
{AMOVD, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0},
{AMOVD, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0},
/* long displacement load */
{AMOVB, C_LAUTO, C_NONE, C_REG, 31, 8, REGSP, LFROM, 0},
{AMOVB, C_LOREG, C_NONE, C_REG, 31, 8, 0, LFROM, 0},
{AMOVBU, C_LAUTO, C_NONE, C_REG, 31, 8, REGSP, LFROM, 0},
{AMOVBU, C_LOREG, C_NONE, C_REG, 31, 8, 0, LFROM, 0},
{AMOVH, C_LAUTO, C_NONE, C_REG, 31, 8, REGSP, LFROM, 0},
{AMOVH, C_LOREG, C_NONE, C_REG, 31, 8, 0, LFROM, 0},
{AMOVW, C_LAUTO, C_NONE, C_REG, 31, 8, REGSP, LFROM, 0},
{AMOVW, C_LOREG, C_NONE, C_REG, 31, 8, 0, LFROM, 0},
{AMOVD, C_LAUTO, C_NONE, C_REG, 31, 8, REGSP, LFROM, 0},
{AMOVD, C_LOREG, C_NONE, C_REG, 31, 8, 0, LFROM, 0},
/* load long effective stack address (load int32 offset and add) */
{AMOVD, C_LACON, C_NONE, C_REG, 34, 8, REGSP, LFROM, 0},
/* pre/post-indexed load (unscaled, signed 9-bit offset) */
{AMOVD, C_LOREG, C_NONE, C_REG, 22, 4, 0, 0, C_XPOST},
{AMOVW, C_LOREG, C_NONE, C_REG, 22, 4, 0, 0, C_XPOST},
{AMOVH, C_LOREG, C_NONE, C_REG, 22, 4, 0, 0, C_XPOST},
{AMOVB, C_LOREG, C_NONE, C_REG, 22, 4, 0, 0, C_XPOST},
{AMOVBU, C_LOREG, C_NONE, C_REG, 22, 4, 0, 0, C_XPOST},
{AFMOVS, C_LOREG, C_NONE, C_FREG, 22, 4, 0, 0, C_XPOST},
{AFMOVD, C_LOREG, C_NONE, C_FREG, 22, 4, 0, 0, C_XPOST},
{AMOVD, C_LOREG, C_NONE, C_REG, 22, 4, 0, 0, C_XPRE},
{AMOVW, C_LOREG, C_NONE, C_REG, 22, 4, 0, 0, C_XPRE},
{AMOVH, C_LOREG, C_NONE, C_REG, 22, 4, 0, 0, C_XPRE},
{AMOVB, C_LOREG, C_NONE, C_REG, 22, 4, 0, 0, C_XPRE},
{AMOVBU, C_LOREG, C_NONE, C_REG, 22, 4, 0, 0, C_XPRE},
{AFMOVS, C_LOREG, C_NONE, C_FREG, 22, 4, 0, 0, C_XPRE},
{AFMOVD, C_LOREG, C_NONE, C_FREG, 22, 4, 0, 0, C_XPRE},
/* pre/post-indexed store (unscaled, signed 9-bit offset) */
{AMOVD, C_REG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPOST},
{AMOVW, C_REG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPOST},
{AMOVH, C_REG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPOST},
{AMOVB, C_REG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPOST},
{AMOVBU, C_REG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPOST},
{AFMOVS, C_FREG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPOST},
{AFMOVD, C_FREG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPOST},
{AMOVD, C_REG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPRE},
{AMOVW, C_REG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPRE},
{AMOVH, C_REG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPRE},
{AMOVB, C_REG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPRE},
{AMOVBU, C_REG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPRE},
{AFMOVS, C_FREG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPRE},
{AFMOVD, C_FREG, C_NONE, C_LOREG, 23, 4, 0, 0, C_XPRE},
/* pre/post-indexed load/store register pair
(unscaled, signed 10-bit quad-aligned offset) */
{ALDP, C_LOREG, C_NONE, C_PAIR, 66, 4, 0, 0, C_XPRE},
{ALDP, C_LOREG, C_NONE, C_PAIR, 66, 4, 0, 0, C_XPOST},
{ASTP, C_PAIR, C_NONE, C_LOREG, 67, 4, 0, 0, C_XPRE},
{ASTP, C_PAIR, C_NONE, C_LOREG, 67, 4, 0, 0, C_XPOST},
/* special */
{AMOVD, C_SPR, C_NONE, C_REG, 35, 4, 0, 0, 0},
{AMRS, C_SPR, C_NONE, C_REG, 35, 4, 0, 0, 0},
{AMOVD, C_REG, C_NONE, C_SPR, 36, 4, 0, 0, 0},
{AMSR, C_REG, C_NONE, C_SPR, 36, 4, 0, 0, 0},
{AMOVD, C_VCON, C_NONE, C_SPR, 37, 4, 0, 0, 0},
{AMSR, C_VCON, C_NONE, C_SPR, 37, 4, 0, 0, 0},
{AERET, C_NONE, C_NONE, C_NONE, 41, 4, 0, 0, 0},
{AFMOVS, C_FREG, C_NONE, C_UAUTO16K, 20, 4, REGSP, 0, 0},
{AFMOVS, C_FREG, C_NONE, C_NSAUTO, 20, 4, REGSP, 0, 0},
{AFMOVS, C_FREG, C_NONE, C_ZOREG, 20, 4, 0, 0, 0},
{AFMOVS, C_FREG, C_NONE, C_UOREG16K, 20, 4, 0, 0, 0},
{AFMOVS, C_FREG, C_NONE, C_NSOREG, 20, 4, 0, 0, 0},
{AFMOVD, C_FREG, C_NONE, C_UAUTO32K, 20, 4, REGSP, 0, 0},
{AFMOVD, C_FREG, C_NONE, C_NSAUTO, 20, 4, REGSP, 0, 0},
{AFMOVD, C_FREG, C_NONE, C_ZOREG, 20, 4, 0, 0, 0},
{AFMOVD, C_FREG, C_NONE, C_UOREG32K, 20, 4, 0, 0, 0},
{AFMOVD, C_FREG, C_NONE, C_NSOREG, 20, 4, 0, 0, 0},
{AFMOVS, C_UAUTO16K, C_NONE, C_FREG, 21, 4, REGSP, 0, 0},
{AFMOVS, C_NSAUTO, C_NONE, C_FREG, 21, 4, REGSP, 0, 0},
{AFMOVS, C_ZOREG, C_NONE, C_FREG, 21, 4, 0, 0, 0},
{AFMOVS, C_UOREG16K, C_NONE, C_FREG, 21, 4, 0, 0, 0},
{AFMOVS, C_NSOREG, C_NONE, C_FREG, 21, 4, 0, 0, 0},
{AFMOVD, C_UAUTO32K, C_NONE, C_FREG, 21, 4, REGSP, 0, 0},
{AFMOVD, C_NSAUTO, C_NONE, C_FREG, 21, 4, REGSP, 0, 0},
{AFMOVD, C_ZOREG, C_NONE, C_FREG, 21, 4, 0, 0, 0},
{AFMOVD, C_UOREG32K, C_NONE, C_FREG, 21, 4, 0, 0, 0},
{AFMOVD, C_NSOREG, C_NONE, C_FREG, 21, 4, 0, 0, 0},
{AFMOVS, C_FREG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0},
{AFMOVS, C_FREG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0},
{AFMOVD, C_FREG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0},
{AFMOVD, C_FREG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0},
{AFMOVS, C_LAUTO, C_NONE, C_FREG, 31, 8, REGSP, LFROM, 0},
{AFMOVS, C_LOREG, C_NONE, C_FREG, 31, 8, 0, LFROM, 0},
{AFMOVD, C_LAUTO, C_NONE, C_FREG, 31, 8, REGSP, LFROM, 0},
{AFMOVD, C_LOREG, C_NONE, C_FREG, 31, 8, 0, LFROM, 0},
{AFMOVS, C_FREG, C_NONE, C_ADDR, 64, 12, 0, 0, 0},
{AFMOVS, C_ADDR, C_NONE, C_FREG, 65, 12, 0, 0, 0},
{AFMOVD, C_FREG, C_NONE, C_ADDR, 64, 12, 0, 0, 0},
{AFMOVD, C_ADDR, C_NONE, C_FREG, 65, 12, 0, 0, 0},
{AFADDS, C_FREG, C_NONE, C_FREG, 54, 4, 0, 0, 0},
{AFADDS, C_FREG, C_FREG, C_FREG, 54, 4, 0, 0, 0},
{AFADDS, C_FCON, C_NONE, C_FREG, 54, 4, 0, 0, 0},
{AFADDS, C_FCON, C_FREG, C_FREG, 54, 4, 0, 0, 0},
{AFMOVS, C_FCON, C_NONE, C_FREG, 54, 4, 0, 0, 0},
{AFMOVS, C_FREG, C_NONE, C_FREG, 54, 4, 0, 0, 0},
{AFMOVD, C_FCON, C_NONE, C_FREG, 54, 4, 0, 0, 0},
{AFMOVD, C_FREG, C_NONE, C_FREG, 54, 4, 0, 0, 0},
{AFCVTZSD, C_FREG, C_NONE, C_REG, 29, 4, 0, 0, 0},
{ASCVTFD, C_REG, C_NONE, C_FREG, 29, 4, 0, 0, 0},
{AFMOVS, C_REG, C_NONE, C_FREG, 29, 4, 0, 0, 0},
{AFMOVS, C_FREG, C_NONE, C_REG, 29, 4, 0, 0, 0},
{AFMOVD, C_REG, C_NONE, C_FREG, 29, 4, 0, 0, 0},
{AFMOVD, C_FREG, C_NONE, C_REG, 29, 4, 0, 0, 0},
{AFCMPS, C_FREG, C_FREG, C_NONE, 56, 4, 0, 0, 0},
{AFCMPS, C_FCON, C_FREG, C_NONE, 56, 4, 0, 0, 0},
{AFCCMPS, C_COND, C_FREG, C_VCON, 57, 4, 0, 0, 0},
{AFCSELD, C_COND, C_REG, C_FREG, 18, 4, 0, 0, 0},
{AFCVTSD, C_FREG, C_NONE, C_FREG, 29, 4, 0, 0, 0},
{ACLREX, C_NONE, C_NONE, C_VCON, 38, 4, 0, 0, 0},
{ACLREX, C_NONE, C_NONE, C_NONE, 38, 4, 0, 0, 0},
{ACBZ, C_REG, C_NONE, C_SBRA, 39, 4, 0, 0, 0},
{ATBZ, C_VCON, C_REG, C_SBRA, 40, 4, 0, 0, 0},
{ASYS, C_VCON, C_NONE, C_NONE, 50, 4, 0, 0, 0},
{ASYS, C_VCON, C_REG, C_NONE, 50, 4, 0, 0, 0},
{ASYSL, C_VCON, C_NONE, C_REG, 50, 4, 0, 0, 0},
{ADMB, C_VCON, C_NONE, C_NONE, 51, 4, 0, 0, 0},
{AHINT, C_VCON, C_NONE, C_NONE, 52, 4, 0, 0, 0},
{ALDAR, C_ZOREG, C_NONE, C_REG, 58, 4, 0, 0, 0},
{ALDXR, C_ZOREG, C_NONE, C_REG, 58, 4, 0, 0, 0},
{ALDAXR, C_ZOREG, C_NONE, C_REG, 58, 4, 0, 0, 0},
{ALDXP, C_ZOREG, C_REG, C_REG, 58, 4, 0, 0, 0},
{ASTLR, C_REG, C_NONE, C_ZOREG, 59, 4, 0, 0, 0}, // to3=C_NONE
{ASTXR, C_REG, C_NONE, C_ZOREG, 59, 4, 0, 0, 0}, // to3=C_REG
{ASTLXR, C_REG, C_NONE, C_ZOREG, 59, 4, 0, 0, 0}, // to3=C_REG
// { ASTXP, C_REG, C_NONE, C_ZOREG, 59, 4, 0 , 0}, // TODO(aram):
{AAESD, C_VREG, C_NONE, C_VREG, 29, 4, 0, 0, 0},
{ASHA1C, C_VREG, C_REG, C_VREG, 1, 4, 0, 0, 0},
{obj.AUNDEF, C_NONE, C_NONE, C_NONE, 90, 4, 0, 0, 0},
{obj.APCDATA, C_VCON, C_NONE, C_VCON, 0, 0, 0, 0, 0},
{obj.AFUNCDATA, C_VCON, C_NONE, C_ADDR, 0, 0, 0, 0, 0},
{obj.ANOP, C_NONE, C_NONE, C_NONE, 0, 0, 0, 0, 0},
{obj.ADUFFZERO, C_NONE, C_NONE, C_SBRA, 5, 4, 0, 0, 0}, // same as AB/ABL
{obj.ADUFFCOPY, C_NONE, C_NONE, C_SBRA, 5, 4, 0, 0, 0}, // same as AB/ABL
{obj.AXXX, C_NONE, C_NONE, C_NONE, 0, 4, 0, 0, 0},
}
/*
* valid pstate field values, and value to use in instruction
*/
var pstatefield = []struct {
a uint32
b uint32
}{
{REG_SPSel, 0<<16 | 4<<12 | 5<<5},
{REG_DAIFSet, 3<<16 | 4<<12 | 6<<5},
{REG_DAIFClr, 3<<16 | 4<<12 | 7<<5},
}
func span7(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
p := cursym.Func.Text
if p == nil || p.Link == nil { // handle external functions and ELF section symbols
return
}
if oprange[AAND&obj.AMask] == nil {
ctxt.Diag("arm64 ops not initialized, call arm64.buildop first")
}
c := ctxt7{ctxt: ctxt, newprog: newprog, cursym: cursym, autosize: int32(p.To.Offset&0xffffffff) + 8}
bflag := 1
pc := int64(0)
p.Pc = pc
var m int
var o *Optab
for p = p.Link; p != nil; p = p.Link {
if p.As == ADWORD && (pc&7) != 0 {
pc += 4
}
p.Pc = pc
o = c.oplook(p)
m = int(o.size)
if m == 0 {
if p.As != obj.ANOP && p.As != obj.AFUNCDATA && p.As != obj.APCDATA {
c.ctxt.Diag("zero-width instruction\n%v", p)
}
continue
}
switch o.flag & (LFROM | LTO) {
case LFROM:
c.addpool(p, &p.From)
case LTO:
c.addpool(p, &p.To)
break
}
if p.As == AB || p.As == obj.ARET || p.As == AERET { /* TODO: other unconditional operations */
c.checkpool(p, 0)
}
pc += int64(m)
if c.blitrl != nil {
c.checkpool(p, 1)
}
}
c.cursym.Size = pc
/*
* if any procedure is large enough to
* generate a large SBRA branch, then
* generate extra passes putting branches
* around jmps to fix. this is rare.
*/
for bflag != 0 {
bflag = 0
pc = 0
for p = c.cursym.Func.Text.Link; p != nil; p = p.Link {
if p.As == ADWORD && (pc&7) != 0 {
pc += 4
}
p.Pc = pc
o = c.oplook(p)
/* very large branches */
if (o.type_ == 7 || o.type_ == 39) && p.Pcond != nil { // 7: BEQ and like, 39: CBZ and like
otxt := p.Pcond.Pc - pc
if otxt <= -(1<<18)+10 || otxt >= (1<<18)-10 {
q := c.newprog()
q.Link = p.Link
p.Link = q
q.As = AB
q.To.Type = obj.TYPE_BRANCH
q.Pcond = p.Pcond
p.Pcond = q
q = c.newprog()
q.Link = p.Link
p.Link = q
q.As = AB
q.To.Type = obj.TYPE_BRANCH
q.Pcond = q.Link.Link
bflag = 1
}
}
m = int(o.size)
if m == 0 {
if p.As != obj.ANOP && p.As != obj.AFUNCDATA && p.As != obj.APCDATA {
c.ctxt.Diag("zero-width instruction\n%v", p)
}
continue
}
pc += int64(m)
}
}
pc += -pc & (funcAlign - 1)
c.cursym.Size = pc
/*
* lay out the code, emitting code and data relocations.
*/
c.cursym.Grow(c.cursym.Size)
bp := c.cursym.P
psz := int32(0)
var i int
var out [6]uint32
for p := c.cursym.Func.Text.Link; p != nil; p = p.Link {
c.pc = p.Pc
o = c.oplook(p)
// need to align DWORDs on 8-byte boundary. The ISA doesn't
// require it, but the various 64-bit loads we generate assume it.
if o.as == ADWORD && psz%8 != 0 {
bp[3] = 0
bp[2] = bp[3]
bp[1] = bp[2]
bp[0] = bp[1]
bp = bp[4:]
psz += 4
}
if int(o.size) > 4*len(out) {
log.Fatalf("out array in span7 is too small, need at least %d for %v", o.size/4, p)
}
c.asmout(p, o, out[:])
for i = 0; i < int(o.size/4); i++ {
c.ctxt.Arch.ByteOrder.PutUint32(bp, out[i])
bp = bp[4:]
psz += 4
}
}
}
/*
* when the first reference to the literal pool threatens
* to go out of range of a 1Mb PC-relative offset
* drop the pool now, and branch round it.
*/
func (c *ctxt7) checkpool(p *obj.Prog, skip int) {
if c.pool.size >= 0xffff0 || !ispcdisp(int32(p.Pc+4+int64(c.pool.size)-int64(c.pool.start)+8)) {
c.flushpool(p, skip)
} else if p.Link == nil {
c.flushpool(p, 2)
}
}
func (c *ctxt7) flushpool(p *obj.Prog, skip int) {
if c.blitrl != nil {
if skip != 0 {
if c.ctxt.Debugvlog && skip == 1 {
fmt.Printf("note: flush literal pool at %#x: len=%d ref=%x\n", uint64(p.Pc+4), c.pool.size, c.pool.start)
}
q := c.newprog()
q.As = AB
q.To.Type = obj.TYPE_BRANCH
q.Pcond = p.Link
q.Link = c.blitrl
q.Pos = p.Pos
c.blitrl = q
} else if p.Pc+int64(c.pool.size)-int64(c.pool.start) < maxPCDisp {
return
}
// The line number for constant pool entries doesn't really matter.
// We set it to the line number of the preceding instruction so that
// there are no deltas to encode in the pc-line tables.
for q := c.blitrl; q != nil; q = q.Link {
q.Pos = p.Pos
}
c.elitrl.Link = p.Link
p.Link = c.blitrl
c.blitrl = nil /* BUG: should refer back to values until out-of-range */
c.elitrl = nil
c.pool.size = 0
c.pool.start = 0
}
}
/*
* TODO: hash
*/
func (c *ctxt7) addpool(p *obj.Prog, a *obj.Addr) {
cls := c.aclass(a)
lit := c.instoffset
t := c.newprog()
t.As = AWORD
sz := 4
// MOVD foo(SB), R is actually
// MOVD addr, REGTMP
// MOVD REGTMP, R
// where addr is the address of the DWORD containing the address of foo.
if p.As == AMOVD && a.Type != obj.TYPE_MEM || cls == C_ADDR || cls == C_VCON || int64(lit) != int64(int32(lit)) || uint64(lit) != uint64(uint32(lit)) {
// conservative: don't know if we want signed or unsigned extension.
// in case of ambiguity, store 64-bit
t.As = ADWORD
sz = 8
}
switch cls {
// TODO(aram): remove.
default:
if a.Name != obj.NAME_EXTERN {
fmt.Printf("addpool: %v in %v shouldn't go to default case\n", DRconv(cls), p)
}
t.To.Offset = a.Offset
t.To.Sym = a.Sym
t.To.Type = a.Type
t.To.Name = a.Name
/* This is here because MOV uint12<<12, R is disabled in optab.
Because of this, we need to load the constant from memory. */
case C_ADDCON:
fallthrough
case C_PSAUTO,
C_PPAUTO,
C_UAUTO4K_8,
C_UAUTO4K_4,
C_UAUTO4K_2,
C_UAUTO4K,
C_UAUTO8K_8,
C_UAUTO8K_4,
C_UAUTO8K,
C_UAUTO16K_8,
C_UAUTO16K,
C_UAUTO32K,
C_NSAUTO,
C_NPAUTO,
C_LAUTO,
C_PPOREG,
C_PSOREG,
C_UOREG4K_8,
C_UOREG4K_4,
C_UOREG4K_2,
C_UOREG4K,
C_UOREG8K_8,
C_UOREG8K_4,
C_UOREG8K,
C_UOREG16K_8,
C_UOREG16K,
C_UOREG32K,
C_NSOREG,
C_NPOREG,
C_LOREG,
C_LACON,
C_LCON,
C_VCON:
if a.Name == obj.NAME_EXTERN {
fmt.Printf("addpool: %v in %v needs reloc\n", DRconv(cls), p)
}
t.To.Type = obj.TYPE_CONST
t.To.Offset = lit
break
}
for q := c.blitrl; q != nil; q = q.Link { /* could hash on t.t0.offset */
if q.To == t.To {
p.Pcond = q
return
}
}
q := c.newprog()
*q = *t
q.Pc = int64(c.pool.size)
if c.blitrl == nil {
c.blitrl = q
c.pool.start = uint32(p.Pc)
} else {
c.elitrl.Link = q
}
c.elitrl = q
c.pool.size = -c.pool.size & (funcAlign - 1)
c.pool.size += uint32(sz)
p.Pcond = q
}
func (c *ctxt7) regoff(a *obj.Addr) uint32 {
c.instoffset = 0
c.aclass(a)
return uint32(c.instoffset)
}
// Maximum PC-relative displacement.
// The actual limit is ±2²⁰, but we are conservative
// to avoid needing to recompute the literal pool flush points
// as span-dependent jumps are enlarged.
const maxPCDisp = 512 * 1024
// ispcdisp reports whether v is a valid PC-relative displacement.
func ispcdisp(v int32) bool {
return -maxPCDisp < v && v < maxPCDisp && v&3 == 0
}
func isaddcon(v int64) bool {
/* uimm12 or uimm24? */
if v < 0 {
return false
}
if (v & 0xFFF) == 0 {
v >>= 12
}
return v <= 0xFFF
}
// isbitcon returns whether a constant can be encoded into a logical instruction.
// bitcon has a binary form of repetition of a bit sequence of length 2, 4, 8, 16, 32, or 64,
// which itself is a rotate (w.r.t. the length of the unit) of a sequence of ones.
// special cases: 0 and -1 are not bitcon.
// this function needs to run against virtually all the constants, so it needs to be fast.
// for this reason, bitcon testing and bitcon encoding are separate functions.
func isbitcon(x uint64) bool {
if x == 1<<64-1 || x == 0 {
return false
}
// determine the period and sign-extend a unit to 64 bits
switch {
case x != x>>32|x<<32:
// period is 64
// nothing to do
case x != x>>16|x<<48:
// period is 32
x = uint64(int64(int32(x)))
case x != x>>8|x<<56:
// period is 16
x = uint64(int64(int16(x)))
case x != x>>4|x<<60:
// period is 8
x = uint64(int64(int8(x)))
default:
// period is 4 or 2, always true
// 0001, 0010, 0100, 1000 -- 0001 rotate
// 0011, 0110, 1100, 1001 -- 0011 rotate
// 0111, 1011, 1101, 1110 -- 0111 rotate
// 0101, 1010 -- 01 rotate, repeat
return true
}
return sequenceOfOnes(x) || sequenceOfOnes(^x)
}
// sequenceOfOnes tests whether a constant is a sequence of ones in binary, with leading and trailing zeros
func sequenceOfOnes(x uint64) bool {
y := x & -x // lowest set bit of x. x is good iff x+y is a power of 2
y += x
return (y-1)&y == 0
}
// bitconEncode returns the encoding of a bitcon used in logical instructions
// x is known to be a bitcon
// a bitcon is a sequence of n ones at low bits (i.e. 1<<n-1), right rotated
// by R bits, and repeated with period of 64, 32, 16, 8, 4, or 2.
// it is encoded in logical instructions with 3 bitfields
// N (1 bit) : R (6 bits) : S (6 bits), where
// N=1 -- period=64
// N=0, S=0xxxxx -- period=32
// N=0, S=10xxxx -- period=16
// N=0, S=110xxx -- period=8
// N=0, S=1110xx -- period=4
// N=0, S=11110x -- period=2
// R is the shift amount, low bits of S = n-1
func bitconEncode(x uint64, mode int) uint32 {
var period uint32
// determine the period and sign-extend a unit to 64 bits
switch {
case x != x>>32|x<<32:
period = 64
case x != x>>16|x<<48:
period = 32
x = uint64(int64(int32(x)))
case x != x>>8|x<<56:
period = 16
x = uint64(int64(int16(x)))
case x != x>>4|x<<60:
period = 8
x = uint64(int64(int8(x)))
case x != x>>2|x<<62:
period = 4
x = uint64(int64(x<<60) >> 60)
default:
period = 2
x = uint64(int64(x<<62) >> 62)
}
neg := false
if int64(x) < 0 {
x = ^x
neg = true
}
y := x & -x // lowest set bit of x.
s := log2(y)
n := log2(x+y) - s // x (or ^x) is a sequence of n ones left shifted by s bits
if neg {
// ^x is a sequence of n ones left shifted by s bits
// adjust n, s for x
s = n + s
n = period - n
}
N := uint32(0)
if mode == 64 && period == 64 {
N = 1
}
R := (period - s) & (period - 1) & uint32(mode-1) // shift amount of right rotate
S := (n - 1) | 63&^(period<<1-1) // low bits = #ones - 1, high bits encodes period
return N<<22 | R<<16 | S<<10
}
func log2(x uint64) uint32 {
if x == 0 {
panic("log2 of 0")
}
n := uint32(0)
if x >= 1<<32 {
x >>= 32
n += 32
}
if x >= 1<<16 {
x >>= 16
n += 16
}
if x >= 1<<8 {
x >>= 8
n += 8
}
if x >= 1<<4 {
x >>= 4
n += 4
}
if x >= 1<<2 {
x >>= 2
n += 2
}
if x >= 1<<1 {
x >>= 1
n += 1
}
return n
}
func autoclass(l int64) int {
if l < 0 {
if l >= -256 {
return C_NSAUTO
}
if l >= -512 && (l&7) == 0 {
return C_NPAUTO
}
return C_LAUTO
}
if l <= 255 {
return C_PSAUTO