openpower/isa/svfpload.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 SVD-Form
   8
   9 * lfssh FRT,SVD(RA),RC
  10
  11 Pseudo-code:
  12
  13     b <- (RA|0)
  14     n <- (RC)[58:63]
  15     EA <- b + SHL64(srcstep * EXTS(SVD), n)
  16     FRT <- DOUBLE(MEM(EA, 4))
  17
  18 Special Registers Altered:
  19
  20     None
  21
  22 # Load Floating-Point Single with Update
  23
  24 SVD-Form
  25
  26 * lfsush FRT,SVD(RA),RC
  27
  28 Pseudo-code:
  29
  30     n <- (RC)[58:63]
  31     EA <- (RA) + SHL64(srcstep * EXTS(SVD), n)
  32     FRT <- DOUBLE(MEM(EA, 4))
  33     RA <- EA
  34
  35 Special Registers Altered:
  36
  37     None
  38
  39 # Load Floating-Point Double
  40
  41 SVD-Form
  42
  43 * lfdsh FRT,SVD(RA),RC
  44
  45 Pseudo-code:
  46
  47     b <- (RA|0)
  48     n <- (RC)[58:63]
  49     EA <- b + SHL64(srcstep * EXTS(SVD), n)
  50     FRT <- MEM(EA, 8)
  51
  52 Special Registers Altered:
  53
  54     None
  55
  56 # Load Floating-Point Double with Update
  57
  58 SVD-Form
  59
  60 * lfdush FRT,SVD(RA),RC
  61
  62 Pseudo-code:
  63
  64     n <- (RC)[58:63]
  65     EA <- (RA) + SHL64(srcstep * EXTS(SVD), n)
  66     FRT <- MEM(EA, 8)
  67     RA <- EA
  68
  69 Special Registers Altered:
  70
  71     None
  72