ppc64.go

     1  // Copyright 2015 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // This file encapsulates some of the odd characteristics of the
     6  // 64-bit PowerPC (PPC64) instruction set, to minimize its interaction
     7  // with the core of the assembler.
     8  
     9  package arch
    10  
    11  import (
    12  	"cmd/internal/obj"
    13  	"cmd/internal/obj/ppc64"
    14  )
    15  
    16  func jumpPPC64(word string) bool {
    17  	switch word {
    18  	case "BC", "BCL", "BEQ", "BGE", "BGT", "BL", "BLE", "BLT", "BNE", "BR", "BVC", "BVS", "BDNZ", "BDZ", "CALL", "JMP":
    19  		return true
    20  	}
    21  	return false
    22  }
    23  
    24  // IsPPC64CMP reports whether the op (as defined by an ppc64.A* constant) is
    25  // one of the CMP instructions that require special handling.
    26  func IsPPC64CMP(op obj.As) bool {
    27  	switch op {
    28  	case ppc64.ACMP, ppc64.ACMPU, ppc64.ACMPW, ppc64.ACMPWU, ppc64.AFCMPO, ppc64.AFCMPU:
    29  		return true
    30  	}
    31  	return false
    32  }
    33  
    34  // IsPPC64NEG reports whether the op (as defined by an ppc64.A* constant) is
    35  // one of the NEG-like instructions that require special handling.
    36  func IsPPC64NEG(op obj.As) bool {
    37  	switch op {
    38  	case ppc64.AADDMECC, ppc64.AADDMEVCC, ppc64.AADDMEV, ppc64.AADDME,
    39  		ppc64.AADDZECC, ppc64.AADDZEVCC, ppc64.AADDZEV, ppc64.AADDZE,
    40  		ppc64.ACNTLZDCC, ppc64.ACNTLZD, ppc64.ACNTLZWCC, ppc64.ACNTLZW,
    41  		ppc64.AEXTSBCC, ppc64.AEXTSB, ppc64.AEXTSHCC, ppc64.AEXTSH,
    42  		ppc64.AEXTSWCC, ppc64.AEXTSW, ppc64.ANEGCC, ppc64.ANEGVCC,
    43  		ppc64.ANEGV, ppc64.ANEG, ppc64.ASLBMFEE, ppc64.ASLBMFEV,
    44  		ppc64.ASLBMTE, ppc64.ASUBMECC, ppc64.ASUBMEVCC, ppc64.ASUBMEV,
    45  		ppc64.ASUBME, ppc64.ASUBZECC, ppc64.ASUBZEVCC, ppc64.ASUBZEV,
    46  		ppc64.ASUBZE:
    47  		return true
    48  	}
    49  	return false
    50  }
    51  
    52  func ppc64RegisterNumber(name string, n int16) (int16, bool) {
    53  	switch name {
    54  	case "CR":
    55  		if 0 <= n && n <= 7 {
    56  			return ppc64.REG_CR0 + n, true
    57  		}
    58  	case "A":
    59  		if 0 <= n && n <= 8 {
    60  			return ppc64.REG_A0 + n, true
    61  		}
    62  	case "VS":
    63  		if 0 <= n && n <= 63 {
    64  			return ppc64.REG_VS0 + n, true
    65  		}
    66  	case "V":
    67  		if 0 <= n && n <= 31 {
    68  			return ppc64.REG_V0 + n, true
    69  		}
    70  	case "F":
    71  		if 0 <= n && n <= 31 {
    72  			return ppc64.REG_F0 + n, true
    73  		}
    74  	case "R":
    75  		if 0 <= n && n <= 31 {
    76  			return ppc64.REG_R0 + n, true
    77  		}
    78  	case "SPR":
    79  		if 0 <= n && n <= 1024 {
    80  			return ppc64.REG_SPR0 + n, true
    81  		}
    82  	}
    83  	return 0, false
    84  }
    85
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