[9fans] acid fpr()

[erik quanstrom]

after updating libmach and acid (and double-checking header files
in /sys/include and /386/include), i still get odd results from acid 
on mutiple intel machines.

is there something else that needs updating?

- erik

using
        void
        main(void)
        {
                double x;
                
                x = atof("3.5");
                x += 3.14;
                exits(0);
        }

i get:

acid: new()
165488: system call     _main   SUBL    $0x48,SP
165488: breakpoint      main+0x3        MOVL    $.string(SB),AX
acid: bpset(main+16)
acid: cont()
165488: breakpoint      main+0x10       FMOVDP  F0,x+0x14(SP)
acid: fpr()
F0       0.
F1       0.
F2       0.
F3       0.
F4       0.
F5       0.
F6       0.
F7       0.
control 0x0272
status  0x3900
tag     0x3fff
ip offset       0x0000175d
cs selector     0x0023
opcode  0xe907
data operand offset     0xeee8
operand selector        0x001b
acid: step()
165488: breakpoint      main+0x14       FMOVD   x+0x14(SP),F0
acid: step()
165488: breakpoint      main+0x18       FADDD   $51eb851f.40091eb8(SB),F0
acid: step()
165488: breakpoint      main+0x1e       FMOVDP  F0,x+0x14(SP)
acid: fpr()
F0      -3.37649908e-11
F1       0.
F2       0.
F3       0.
F4       0.
F5       0.
F6       0.
F7       0.
control 0x0272
status  0x3b20
tag     0x3fff
ip offset       0x00001038
cs selector     0x0023
opcode  0xe907
data operand offset     0x6044
operand selector        0x001b