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|
|
| do_func.sa 3.4 2/18/91
|
| Do_func performs the unimplemented operation. The operation
| to be performed is determined from the lower 7 bits of the
| extension word (except in the case of fmovecr and fsincos).
| The opcode and tag bits form an index into a jump table in
| tbldo.sa. Cases of zero, infinity and NaN are handled in
| do_func by forcing the default result. Normalized and
| denormalized (there are no unnormalized numbers at this
| point) are passed onto the emulation code.
|
| CMDREG1B and STAG are extracted from the fsave frame
| and combined to form the table index. The function called
| will start with a0 pointing to the ETEMP operand. Dyadic
| functions can find FPTEMP at -12(a0).
|
| Called functions return their result in fp0. Sincos returns
| sin(x) in fp0 and cos(x) in fp1.
|
| Copyright (C) Motorola, Inc. 1990
| All Rights Reserved
|
| For details on the license for this file, please see the
| file, README, in this same directory.
DO_FUNC: |idnt 2,1 | Motorola 040 Floating Point Software Package
|section 8
#include "fpsp.h"
|xref t_dz2
|xref t_operr
|xref t_inx2
|xref t_resdnrm
|xref dst_nan
|xref src_nan
|xref nrm_set
|xref sto_cos
|xref tblpre
|xref slognp1,slogn,slog10,slog2
|xref slognd,slog10d,slog2d
|xref smod,srem
|xref sscale
|xref smovcr
PONE: .long 0x3fff0000,0x80000000,0x00000000 |+1
MONE: .long 0xbfff0000,0x80000000,0x00000000 |-1
PZERO: .long 0x00000000,0x00000000,0x00000000 |+0
MZERO: .long 0x80000000,0x00000000,0x00000000 |-0
PINF: .long 0x7fff0000,0x00000000,0x00000000 |+inf
MINF: .long 0xffff0000,0x00000000,0x00000000 |-inf
QNAN: .long 0x7fff0000,0xffffffff,0xffffffff |non-signaling nan
PPIBY2: .long 0x3FFF0000,0xC90FDAA2,0x2168C235 |+PI/2
MPIBY2: .long 0xbFFF0000,0xC90FDAA2,0x2168C235 |-PI/2
.global do_func
do_func:
clrb CU_ONLY(%a6)
|
| Check for fmovecr. It does not follow the format of fp gen
| unimplemented instructions. The test is on the upper 6 bits;
| if they are $17, the inst is fmovecr. Call entry smovcr
| directly.
|
bfextu CMDREG1B(%a6){#0:#6},%d0 |get opclass and src fields
cmpil #0x17,%d0 |if op class and size fields are $17,
| ;it is FMOVECR; if not, continue
bnes not_fmovecr
jmp smovcr |fmovecr; jmp directly to emulation
not_fmovecr:
movew CMDREG1B(%a6),%d0
andl #0x7F,%d0
cmpil #0x38,%d0 |if the extension is >= $38,
bge serror |it is illegal
bfextu STAG(%a6){#0:#3},%d1
lsll #3,%d0 |make room for STAG
addl %d1,%d0 |combine for final index into table
leal tblpre,%a1 |start of monster jump table
movel (%a1,%d0.w*4),%a1 |real target address
leal ETEMP(%a6),%a0 |a0 is pointer to src op
movel USER_FPCR(%a6),%d1
andl #0xFF,%d1 | discard all but rounding mode/prec
fmovel #0,%fpcr
jmp (%a1)
|
| ERROR
|
.global serror
serror:
st STORE_FLG(%a6)
rts
|
| These routines load forced values into fp0. They are called
| by index into tbldo.
|
| Load a signed zero to fp0 and set inex2/ainex
|
.global snzrinx
snzrinx:
btstb #sign_bit,LOCAL_EX(%a0) |get sign of source operand
bnes ld_mzinx |if negative, branch
bsr ld_pzero |bsr so we can return and set inx
bra t_inx2 |now, set the inx for the next inst
ld_mzinx:
bsr ld_mzero |if neg, load neg zero, return here
bra t_inx2 |now, set the inx for the next inst
|
| Load a signed zero to fp0; do not set inex2/ainex
|
.global szero
szero:
btstb #sign_bit,LOCAL_EX(%a0) |get sign of source operand
bne ld_mzero |if neg, load neg zero
bra ld_pzero |load positive zero
|
| Load a signed infinity to fp0; do not set inex2/ainex
|
.global sinf
sinf:
btstb #sign_bit,LOCAL_EX(%a0) |get sign of source operand
bne ld_minf |if negative branch
bra ld_pinf
|
| Load a signed one to fp0; do not set inex2/ainex
|
.global sone
sone:
btstb #sign_bit,LOCAL_EX(%a0) |check sign of source
bne ld_mone
bra ld_pone
|
| Load a signed pi/2 to fp0; do not set inex2/ainex
|
.global spi_2
spi_2:
btstb #sign_bit,LOCAL_EX(%a0) |check sign of source
bne ld_mpi2
bra ld_ppi2
|
| Load either a +0 or +inf for plus/minus operand
|
.global szr_inf
szr_inf:
btstb #sign_bit,LOCAL_EX(%a0) |check sign of source
bne ld_pzero
bra ld_pinf
|
| Result is either an operr or +inf for plus/minus operand
| [Used by slogn, slognp1, slog10, and slog2]
|
.global sopr_inf
sopr_inf:
btstb #sign_bit,LOCAL_EX(%a0) |check sign of source
bne t_operr
bra ld_pinf
|
| FLOGNP1
|
.global sslognp1
sslognp1:
fmovemx (%a0),%fp0-%fp0
fcmpb #-1,%fp0
fbgt slognp1
fbeq t_dz2 |if = -1, divide by zero exception
fmovel #0,%FPSR |clr N flag
bra t_operr |take care of operands < -1
|
| FETOXM1
|
.global setoxm1i
setoxm1i:
btstb #sign_bit,LOCAL_EX(%a0) |check sign of source
bne ld_mone
bra ld_pinf
|
| FLOGN
|
| Test for 1.0 as an input argument, returning +zero. Also check
| the sign and return operr if negative.
|
.global sslogn
sslogn:
btstb #sign_bit,LOCAL_EX(%a0)
bne t_operr |take care of operands < 0
cmpiw #0x3fff,LOCAL_EX(%a0) |test for 1.0 input
|