github.com/peggyl/go@v0.0.0-20151008231540-ae315999c2d5/src/cmd/asm/internal/arch/ppc64.go (about)

     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 "cmd/internal/obj/ppc64"
    12  
    13  func jumpPPC64(word string) bool {
    14  	switch word {
    15  	case "BC", "BCL", "BEQ", "BGE", "BGT", "BL", "BLE", "BLT", "BNE", "BR", "BVC", "BVS", "CALL", "JMP":
    16  		return true
    17  	}
    18  	return false
    19  }
    20  
    21  // IsPPC64RLD reports whether the op (as defined by an ppc64.A* constant) is
    22  // one of the RLD-like instructions that require special handling.
    23  // The FMADD-like instructions behave similarly.
    24  func IsPPC64RLD(op int) bool {
    25  	switch op {
    26  	case ppc64.ARLDC, ppc64.ARLDCCC, ppc64.ARLDCL, ppc64.ARLDCLCC,
    27  		ppc64.ARLDCR, ppc64.ARLDCRCC, ppc64.ARLDMI, ppc64.ARLDMICC,
    28  		ppc64.ARLWMI, ppc64.ARLWMICC, ppc64.ARLWNM, ppc64.ARLWNMCC:
    29  		return true
    30  	case ppc64.AFMADD, ppc64.AFMADDCC, ppc64.AFMADDS, ppc64.AFMADDSCC,
    31  		ppc64.AFMSUB, ppc64.AFMSUBCC, ppc64.AFMSUBS, ppc64.AFMSUBSCC,
    32  		ppc64.AFNMADD, ppc64.AFNMADDCC, ppc64.AFNMADDS, ppc64.AFNMADDSCC,
    33  		ppc64.AFNMSUB, ppc64.AFNMSUBCC, ppc64.AFNMSUBS, ppc64.AFNMSUBSCC:
    34  		return true
    35  	}
    36  	return false
    37  }
    38  
    39  // IsPPC64CMP reports whether the op (as defined by an ppc64.A* constant) is
    40  // one of the CMP instructions that require special handling.
    41  func IsPPC64CMP(op int) bool {
    42  	switch op {
    43  	case ppc64.ACMP, ppc64.ACMPU, ppc64.ACMPW, ppc64.ACMPWU:
    44  		return true
    45  	}
    46  	return false
    47  }
    48  
    49  // IsPPC64NEG reports whether the op (as defined by an ppc64.A* constant) is
    50  // one of the NEG-like instructions that require special handling.
    51  func IsPPC64NEG(op int) bool {
    52  	switch op {
    53  	case ppc64.AADDMECC, ppc64.AADDMEVCC, ppc64.AADDMEV, ppc64.AADDME,
    54  		ppc64.AADDZECC, ppc64.AADDZEVCC, ppc64.AADDZEV, ppc64.AADDZE,
    55  		ppc64.ACNTLZDCC, ppc64.ACNTLZD, ppc64.ACNTLZWCC, ppc64.ACNTLZW,
    56  		ppc64.AEXTSBCC, ppc64.AEXTSB, ppc64.AEXTSHCC, ppc64.AEXTSH,
    57  		ppc64.AEXTSWCC, ppc64.AEXTSW, ppc64.ANEGCC, ppc64.ANEGVCC,
    58  		ppc64.ANEGV, ppc64.ANEG, ppc64.ASLBMFEE, ppc64.ASLBMFEV,
    59  		ppc64.ASLBMTE, ppc64.ASUBMECC, ppc64.ASUBMEVCC, ppc64.ASUBMEV,
    60  		ppc64.ASUBME, ppc64.ASUBZECC, ppc64.ASUBZEVCC, ppc64.ASUBZEV,
    61  		ppc64.ASUBZE:
    62  		return true
    63  	}
    64  	return false
    65  }
    66  
    67  func ppc64RegisterNumber(name string, n int16) (int16, bool) {
    68  	switch name {
    69  	case "CR":
    70  		if 0 <= n && n <= 7 {
    71  			return ppc64.REG_CR0 + n, true
    72  		}
    73  	case "F":
    74  		if 0 <= n && n <= 31 {
    75  			return ppc64.REG_F0 + n, true
    76  		}
    77  	case "R":
    78  		if 0 <= n && n <= 31 {
    79  			return ppc64.REG_R0 + n, true
    80  		}
    81  	case "SPR":
    82  		if 0 <= n && n <= 1024 {
    83  			return ppc64.REG_SPR0 + n, true
    84  		}
    85  	}
    86  	return 0, false
    87  }