openpower/isa/pifploadshift.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 with Post-Update Indexed
   6
   7 X-Form
   8
   9 * lfsupx FRT,RA,RB
  10
  11 Pseudo-code:
  12
  13     EA <- (RA) + (RB)
  14     FRT <- DOUBLE(MEM(RA, 4))
  15     RA <- EA
  16
  17 Description:
  18
  19     Let the effective address (EA) be the sum (RA)+(RB).
  20
  21     The word in storage addressed by EA is interpreted as
  22     a floating-point single-precision operand. This word is
  23     converted to floating-point double format (see
  24     page 138) and placed into register FRT.
  25
  26     EA is placed into register RA.
  27
  28     If RA=0, the instruction form is invalid.
  29
  30 Special Registers Altered:
  31
  32     None
  33
  34 # Load Floating-Point Double with Post-Update Indexed
  35
  36 X-Form
  37
  38 * lfduxp FRT,RA,RB
  39
  40 Pseudo-code:
  41
  42     EA <- (RA) + (RB)
  43     FRT <- MEM(RA, 8)
  44     RA <- EA
  45
  46 Description:
  47
  48     Let the effective address (EA) be the sum (RA)+(RB).
  49
  50     The doubleword in storage addressed by EA is loaded
  51     into register FRT.
  52
  53     EA is placed into register RA.
  54
  55     If RA=0, the instruction form is invalid.
  56
  57 Special Registers Altered:
  58
  59     None
  60