openpower/isa/fpload.mdwn

   1 <!-- X Instructions here described in PowerISA Version 3.0 B Book 1 -->
   2
   3 <!-- Section 4.6.1 Floating-point storage access instructions. P 140 - 143 -->
   4
   5 # Load Floating-Point Single
   6
   7 D-Form
   8
   9 * lfs FRT,D(RA)
  10
  11 Pseudo-code:
  12
  13     EA <- (RA|0) + EXTS(D)
  14     FRT <- DOUBLE(MEM(EA, 4))
  15
  16 Special Registers Altered:
  17
  18     None
  19
  20 # Load Floating-Point Single Indexed
  21
  22 X-Form
  23
  24 * lfsx FRT,RA,RB
  25
  26 Pseudo-code:
  27
  28     EA <- (RA|0) + (RB)
  29     FRT <- DOUBLE(MEM(EA, 4))
  30
  31 Special Registers Altered:
  32
  33     None
  34
  35 # Load Floating-Point Single with Update
  36
  37 D-Form
  38
  39 * lfsu FRT,D(RA)
  40
  41 Pseudo-code:
  42
  43     EA <- (RA) + EXTS(D)
  44     FRT <- DOUBLE(MEM(EA, 4))
  45     RA <- EA
  46
  47 Special Registers Altered:
  48
  49     None
  50
  51 # Load Floating-Point Single with Update Indexed
  52
  53 X-Form
  54
  55 * lfsux FRT,RA,RB
  56
  57 Pseudo-code:
  58
  59     EA <- (RA) + (RB)
  60     FRT <- DOUBLE(MEM(EA, 4))
  61     RA <- EA
  62
  63 Special Registers Altered:
  64
  65     None
  66
  67 # Load Floating-Point Double
  68
  69 D-Form
  70
  71 * lfd FRT,D(RA)
  72
  73 Pseudo-code:
  74
  75     EA <- (RA|0) + EXTS(D)
  76     FRT <- MEM(EA, 8)
  77
  78 Special Registers Altered:
  79
  80     None
  81
  82 # Load Floating-Point Double Indexed
  83
  84 X-Form
  85
  86 * lfdx FRT,RA,RB
  87
  88 Pseudo-code:
  89
  90     EA <- (RA|0) + (RB)
  91     FRT <- MEM(EA, 8)
  92
  93 Special Registers Altered:
  94
  95     None
  96
  97 # Load Floating-Point Double with Update
  98
  99 D-Form
 100
 101 * lfdu FRT,D(RA)
 102
 103 Pseudo-code:
 104
 105     EA <- (RA) + EXTS(D)
 106     FRT <- MEM(EA, 8)
 107     RA <- EA
 108
 109 Special Registers Altered:
 110
 111     None
 112
 113 # Load Floating-Point Double with Update Indexed
 114
 115 X-Form
 116
 117 * lfdux FRT,RA,RB
 118
 119 Pseudo-code:
 120
 121     EA <- (RA) + (RB)
 122     FRT <- MEM(EA, 8)
 123     RA <- EA
 124
 125 Special Registers Altered:
 126
 127     None
 128
 129 # Load Floating-Point as Integer Word Algebraic Indexed
 130
 131 X-Form
 132
 133 * lfiwax FRT,RA,RB
 134
 135 Pseudo-code:
 136
 137     EA <- (RA|0) + (RB)
 138     FRT <- EXTS(MEM(EA, 4))
 139
 140 Special Registers Altered:
 141
 142     None
 143
 144 # Load Floating-Point as Integer Word Zero Indexed
 145
 146 X-Form
 147
 148 * lfiwix FRT,RA,RB
 149
 150 Pseudo-code:
 151
 152     EA <- (RA|0) + (RB)
 153     FRT <- [0]*32 || MEM(EA, 4)
 154
 155 Special Registers Altered:
 156
 157     None