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      1 // Do not edit. Bootstrap copy of /usr/local/google/buildbot/src/android/build-tools/out/obj/go/src/cmd/compile/internal/arm64/reg.go
      2 
      3 //line /usr/local/google/buildbot/src/android/build-tools/out/obj/go/src/cmd/compile/internal/arm64/reg.go:1
      4 // Derived from Inferno utils/6c/reg.c
      5 // http://code.google.com/p/inferno-os/source/browse/utils/6c/reg.c
      6 //
      7 //	Copyright  1994-1999 Lucent Technologies Inc.  All rights reserved.
      8 //	Portions Copyright  1995-1997 C H Forsyth (forsyth (a] terzarima.net)
      9 //	Portions Copyright  1997-1999 Vita Nuova Limited
     10 //	Portions Copyright  2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
     11 //	Portions Copyright  2004,2006 Bruce Ellis
     12 //	Portions Copyright  2005-2007 C H Forsyth (forsyth (a] terzarima.net)
     13 //	Revisions Copyright  2000-2007 Lucent Technologies Inc. and others
     14 //	Portions Copyright  2009 The Go Authors.  All rights reserved.
     15 //
     16 // Permission is hereby granted, free of charge, to any person obtaining a copy
     17 // of this software and associated documentation files (the "Software"), to deal
     18 // in the Software without restriction, including without limitation the rights
     19 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     20 // copies of the Software, and to permit persons to whom the Software is
     21 // furnished to do so, subject to the following conditions:
     22 //
     23 // The above copyright notice and this permission notice shall be included in
     24 // all copies or substantial portions of the Software.
     25 //
     26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     27 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     28 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
     29 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     30 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     31 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     32 // THE SOFTWARE.
     33 
     34 package arm64
     35 
     36 import (
     37 	"bootstrap/compile/internal/gc"
     38 	"bootstrap/internal/obj/arm64"
     39 )
     40 
     41 const (
     42 	NREGVAR = 64 /* 32 general + 32 floating */
     43 )
     44 
     45 var regname = []string{
     46 	".R0",
     47 	".R1",
     48 	".R2",
     49 	".R3",
     50 	".R4",
     51 	".R5",
     52 	".R6",
     53 	".R7",
     54 	".R8",
     55 	".R9",
     56 	".R10",
     57 	".R11",
     58 	".R12",
     59 	".R13",
     60 	".R14",
     61 	".R15",
     62 	".R16",
     63 	".R17",
     64 	".R18",
     65 	".R19",
     66 	".R20",
     67 	".R21",
     68 	".R22",
     69 	".R23",
     70 	".R24",
     71 	".R25",
     72 	".R26",
     73 	".R27",
     74 	".R28",
     75 	".R29",
     76 	".R30",
     77 	".R31",
     78 	".F0",
     79 	".F1",
     80 	".F2",
     81 	".F3",
     82 	".F4",
     83 	".F5",
     84 	".F6",
     85 	".F7",
     86 	".F8",
     87 	".F9",
     88 	".F10",
     89 	".F11",
     90 	".F12",
     91 	".F13",
     92 	".F14",
     93 	".F15",
     94 	".F16",
     95 	".F17",
     96 	".F18",
     97 	".F19",
     98 	".F20",
     99 	".F21",
    100 	".F22",
    101 	".F23",
    102 	".F24",
    103 	".F25",
    104 	".F26",
    105 	".F27",
    106 	".F28",
    107 	".F29",
    108 	".F30",
    109 	".F31",
    110 }
    111 
    112 func regnames(n *int) []string {
    113 	*n = NREGVAR
    114 	return regname
    115 }
    116 
    117 func excludedregs() uint64 {
    118 	// Exclude registers with fixed functions
    119 	regbits := uint64(RtoB(arm64.REGRT1) | RtoB(arm64.REGRT2) | RtoB(arm64.REGPR))
    120 
    121 	// Exclude R26 - R31.
    122 	for r := arm64.REGMAX + 1; r <= arm64.REGZERO; r++ {
    123 		regbits |= RtoB(r)
    124 	}
    125 
    126 	// Also exclude floating point registers with fixed constants
    127 	regbits |= RtoB(arm64.REG_F27) | RtoB(arm64.REG_F28) | RtoB(arm64.REG_F29) | RtoB(arm64.REG_F30) | RtoB(arm64.REG_F31)
    128 
    129 	return regbits
    130 }
    131 
    132 func doregbits(r int) uint64 {
    133 	return 0
    134 }
    135 
    136 /*
    137  * track register variables including external registers:
    138  *	bit	reg
    139  *	0	R0
    140  *	1	R1
    141  *	...	...
    142  *	31	R31
    143  *	32+0	F0
    144  *	32+1	F1
    145  *	...	...
    146  *	32+31	F31
    147  */
    148 func RtoB(r int) uint64 {
    149 	if r >= arm64.REG_R0 && r <= arm64.REG_R31 {
    150 		return 1 << uint(r-arm64.REG_R0)
    151 	}
    152 	if r >= arm64.REG_F0 && r <= arm64.REG_F31 {
    153 		return 1 << uint(32+r-arm64.REG_F0)
    154 	}
    155 	return 0
    156 }
    157 
    158 func BtoR(b uint64) int {
    159 	b &= 0xffffffff
    160 	if b == 0 {
    161 		return 0
    162 	}
    163 	return gc.Bitno(b) + arm64.REG_R0
    164 }
    165 
    166 func BtoF(b uint64) int {
    167 	b >>= 32
    168 	if b == 0 {
    169 		return 0
    170 	}
    171 	return gc.Bitno(b) + arm64.REG_F0
    172 }
    173