Sun Microsystems UltraSPARC-I User Manual page 311

UltraSPARC User's Manual
A Class:
,
F{i,x}TO{s,d}
,
FAND{s} FANDNOT1{s}
,
FMOV{s,d}cc
,
FOR{s} FORNOT1{s}
,
FSRC1{s} FSRC2{s}
M Class:
FCMP{LE,NE,GT,EQ}{16,32}
,
FMUL{s,d} FMUL8x16{AL,AU}
,
FDIV{s,d} FSQRT{s,d}
that is, no earlier instructions are dispatched with these instructions.
17.8.1 Floating-Point and Graphics Instruction Dependencies
Instructions that have the same destination register (in the same register file) can-
not be grouped together. For example:
FADD f2, f2, f6
LDF [r0+r1], f6
FBfcc cannot be grouped with an older
ent floating-point condition codes. For example:
FCMP fcc0, f2, f4
FBfcc fcc1, target
It is possible, however, for an
the same group. For example:
FBfcc
FCMP
An that references the same condition code set by a
FMOVcc
be in the same or the following group. For example:
FCMP fcc0, f2, f4
FMOVcc fcc0, f6, f8
cannot be in the same group as
FMOVcc
A-Class floating-point instructions.
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,
F{s,d}TO{d,s} F{s,d}TO{i,x}
,
FANDNOT2{s}
, ,
FNAND{s} FNEG{s,d} FNOR{s}
, ,
FORNOT2{s} FPADD{16,32}{s}
, , ,
FSUB{s,d} FXNOR{s}
, ,
FDIST FDIV{s,d}
,
FPACK{16,32,FIX}
, and
FCMP{LE,NE,GT,EQ}{16,32}
G E C N
G E C
FCMP{E}{s,d}
G E C N
G E C
FCMP{E}{s,d}
G E C N N N
1 2 3
G E C N N N
1 2 3
G E C N
1
G E
FCMP{E}{s,d},
, , ,
FABS{s,d} FADD{s,d}
, ,
FCMP{E}{s,d} FEXPAND
, ,
FNOT1{s} FNOT2{s}
, ,
FPMERGE FPSUB{16,32}{s}
, and .
FXOR{s} FZERO{s}
, ,
FMUL{d}8SUx16 FMUL{d}8ULx16
, , and
FsMULd FSQRT{s,d}
instructions break the group;
N N W
1 2 3
N N N W
1 2 3
, even if they reference differ-
N N W
1 2 3
N N N W
1 2 3
to be grouped with an older FBfcc in
W
W
FCMP{E}{s,d}
N N W
2 3
C N N N W
1 2 3
because they are both
,
FALIGNDATA
, ,
FMOVr{s,d}
, ,
FONE{s}
,
,
.
cannot