openpower/isa/fpmove.mdwn

   1 <!-- X Instructions here described in PowerISA Version 3.0 B Book 1 -->
   2
   3 <!-- Section 4.6.5 Floating-point Move instructions. P 150 -->
   4
   5 # Floating Move Register
   6
   7 X-Form
   8
   9 * fmr FRT,FRB (Rc=0)
  10 * fmr. FRT,FRB (Rc=1)
  11
  12 Pseudo-code:
  13
  14     FRT <- FRB[0:63]
  15
  16 Special Registers Altered:
  17
  18     CR1          (if Rc=1)
  19
  20 # Floating Absolute Value Register
  21
  22 X-Form
  23
  24 * fabs FRT,FRB (Rc=0)
  25 * fabs. FRT,FRB (Rc=1)
  26
  27 Pseudo-code:
  28
  29     FRT <- 0b0 || FRB[1:63]
  30
  31 Special Registers Altered:
  32
  33     CR1          (if Rc=1)
  34
  35 # Floating Negative Absolute Value Register
  36
  37 X-Form
  38
  39 * fnabs FRT,FRB (Rc=0)
  40 * fnabs. FRT,FRB (Rc=1)
  41
  42 Pseudo-code:
  43
  44     FRT <- 0b1 || FRB[1:63]
  45
  46 Special Registers Altered:
  47
  48     CR1          (if Rc=1)
  49
  50 # Floating Negate Register
  51
  52 X-Form
  53
  54 * fneg FRT,FRB (Rc=0)
  55 * fneg. FRT,FRB (Rc=1)
  56
  57 Pseudo-code:
  58
  59     FRT <- ¬FRB[0] || FRB[1:63]
  60
  61 Special Registers Altered:
  62
  63     CR1          (if Rc=1)
  64
  65 # Floating Copy Sign  Register
  66
  67 X-Form
  68
  69 * fcpsgn FRT,FRA,FRB (Rc=0)
  70 * fcpsgn. FRT,FRA,FRB (Rc=1)
  71
  72 Pseudo-code:
  73
  74     FRT <- FRA[0] || FRB[1:63]
  75
  76 Special Registers Altered:
  77
  78     CR1          (if Rc=1)
  79
  80 # [DRAFT] Floating Move To GPR
  81
  82 X-Form
  83
  84 * mffpr RT,FRB (Rc=0)
  85 * mffpr. RT,FRB (Rc=1)
  86
  87 Pseudo-code:
  88
  89     RT <- (FRB)
  90
  91 Special Registers Altered:
  92
  93     CR0          (if Rc=1)
  94
  95 # [DRAFT] Floating Move To GPR Single
  96
  97 X-Form
  98
  99 * mffprs RT,FRB (Rc=0)
 100 * mffprs. RT,FRB (Rc=1)
 101
 102 Pseudo-code:
 103
 104     RT <- [0] * (XLEN/2) || SINGLE((FRB))  # SINGLE since that's what stfs uses
 105
 106 Special Registers Altered:
 107
 108     CR0          (if Rc=1)
 109
 110 # [DRAFT] Floating Move From GPR
 111
 112 X-Form
 113
 114 * mtfpr FRT,RB
 115
 116 Pseudo-code:
 117
 118     FRT <- (RB)
 119
 120 Special Registers Altered:
 121
 122     None
 123
 124 # [DRAFT] Floating Move From GPR Single
 125
 126 X-Form
 127
 128 * mtfprs FRT,RB
 129
 130 Pseudo-code:
 131
 132     FRT <- DOUBLE((RB)[XLEN/2:XLEN-1])  # DOUBLE since that's what lfs uses
 133
 134 Special Registers Altered:
 135
 136     None