openpower/isa/fpstore.mdwn

   1 <!-- X Instructions here described in PowerISA Version 3.0 B Book 1 -->
   2
   3 <!-- Section 4.6.3 Floating-point store instructions. P 144 - 147 -->
   4
   5 # Store Floating-Point Single
   6
   7 D-Form
   8
   9 * stfs FRS,D(RA)
  10
  11 Pseudo-code:
  12
  13     EA <- (RA|0) + EXTS(D)
  14     MEM(EA, 4)<- SINGLE( (FRS) )
  15
  16 Description:
  17
  18     Let the effective address (EA) be the sum (RA|0)+D.
  19
  20     The contents of register FRS are converted to single
  21     format (see page 142) and stored into the word in stor-
  22     age addressed by EA.
  23
  24 Special Registers Altered:
  25
  26     None
  27
  28 # Store Floating-Point Single Indexed
  29
  30 X-Form
  31
  32 * stfsx FRS,RA,RB
  33
  34 Pseudo-code:
  35
  36     EA <- (RA|0) + (RB)
  37     MEM(EA, 4)<- SINGLE( (FRS) )
  38
  39 Description:
  40
  41     Let the effective address (EA) be the sum (RA|0)+(RB).
  42
  43     The contents of register FRS are converted to single
  44     format (see page 142) and stored into the word in stor-
  45     age addressed by EA.
  46
  47 Special Registers Altered:
  48
  49     None
  50
  51 # Store Floating-Point Single with Update
  52
  53 D-Form
  54
  55 * stfsu FRS,D(RA)
  56
  57 Pseudo-code:
  58
  59     EA <- (RA) + EXTS(D)
  60     MEM(EA, 4)<- SINGLE( (FRS) )
  61     RA <- EA
  62
  63 Special Registers Altered:
  64
  65     None
  66
  67 # Store Floating-Point Single with Update Indexed
  68
  69 X-Form
  70
  71 * stfsux FRS,RA,RB
  72
  73 Pseudo-code:
  74
  75     EA <- (RA) + (RB)
  76     MEM(EA, 4)<- SINGLE( (FRS) )
  77     RA <- EA
  78
  79 Special Registers Altered:
  80
  81     None
  82
  83 # Store Floating-Point Double
  84
  85 D-Form
  86
  87 * stfd FRS,D(RA)
  88
  89 Pseudo-code:
  90
  91     EA <- (RA|0) + EXTS(D)
  92     MEM(EA, 8)<- (FRS)
  93
  94 Special Registers Altered:
  95
  96     None
  97
  98 # Store Floating-Point Double Indexed
  99
 100 X-Form
 101
 102 * stfdx FRS,RA,RB
 103
 104 Pseudo-code:
 105
 106     EA <- (RA|0) + (RB)
 107     MEM(EA, 8)<- (FRS)
 108
 109 Special Registers Altered:
 110
 111     None
 112
 113 # Store Floating-Point Double with Update
 114
 115 D-Form
 116
 117 * stfdu FRS,D(RA)
 118
 119 Pseudo-code:
 120
 121     EA <- (RA) + EXTS(D)
 122     MEM(EA, 8)<- (FRS)
 123     RA <- EA
 124
 125 Special Registers Altered:
 126
 127     None
 128
 129 # Store Floating-Point Double with Update Indexed
 130
 131 X-Form
 132
 133 * stfdux FRS,RA,RB
 134
 135 Pseudo-code:
 136
 137     EA <- (RA) + (RB)
 138     MEM(EA, 8)<- (FRS)
 139     RA <- EA
 140
 141 Special Registers Altered:
 142
 143     None
 144
 145 # Store Floating-Point as Integer Word Indexed
 146
 147 X-Form
 148
 149 * stfiwx FRS,RA,RB
 150
 151 Pseudo-code:
 152
 153     b <- (RA|0)
 154     EA <- b + (RB)
 155     MEM(EA, 8)<- (FRS)[32:63]
 156
 157 Special Registers Altered:
 158
 159     None