559 lines
14 KiB
ArmAsm
559 lines
14 KiB
ArmAsm
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| do_func.sa 3.4 2/18/91
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| Do_func performs the unimplemented operation. The operation
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| to be performed is determined from the lower 7 bits of the
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| extension word (except in the case of fmovecr and fsincos).
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| The opcode and tag bits form an index into a jump table in
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| tbldo.sa. Cases of zero, infinity and NaN are handled in
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| do_func by forcing the default result. Normalized and
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| denormalized (there are no unnormalized numbers at this
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| point) are passed onto the emulation code.
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| CMDREG1B and STAG are extracted from the fsave frame
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| and combined to form the table index. The function called
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| will start with a0 pointing to the ETEMP operand. Dyadic
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| functions can find FPTEMP at -12(a0).
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| Called functions return their result in fp0. Sincos returns
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| sin(x) in fp0 and cos(x) in fp1.
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| Copyright (C) Motorola, Inc. 1990
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| All Rights Reserved
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| For details on the license for this file, please see the
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| file, README, in this same directory.
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DO_FUNC: |idnt 2,1 | Motorola 040 Floating Point Software Package
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|section 8
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#include "fpsp.h"
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|xref t_dz2
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|xref t_operr
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|xref t_inx2
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|xref t_resdnrm
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|xref dst_nan
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|xref src_nan
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|xref nrm_set
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|xref sto_cos
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|xref tblpre
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|xref slognp1,slogn,slog10,slog2
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|xref slognd,slog10d,slog2d
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|xref smod,srem
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|xref sscale
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|xref smovcr
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PONE: .long 0x3fff0000,0x80000000,0x00000000 |+1
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MONE: .long 0xbfff0000,0x80000000,0x00000000 |-1
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PZERO: .long 0x00000000,0x00000000,0x00000000 |+0
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MZERO: .long 0x80000000,0x00000000,0x00000000 |-0
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PINF: .long 0x7fff0000,0x00000000,0x00000000 |+inf
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MINF: .long 0xffff0000,0x00000000,0x00000000 |-inf
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QNAN: .long 0x7fff0000,0xffffffff,0xffffffff |non-signaling nan
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PPIBY2: .long 0x3FFF0000,0xC90FDAA2,0x2168C235 |+PI/2
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MPIBY2: .long 0xbFFF0000,0xC90FDAA2,0x2168C235 |-PI/2
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.global do_func
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do_func:
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clrb CU_ONLY(%a6)
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| Check for fmovecr. It does not follow the format of fp gen
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| unimplemented instructions. The test is on the upper 6 bits;
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| if they are $17, the inst is fmovecr. Call entry smovcr
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| directly.
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bfextu CMDREG1B(%a6){#0:#6},%d0 |get opclass and src fields
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cmpil #0x17,%d0 |if op class and size fields are $17,
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| ;it is FMOVECR; if not, continue
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bnes not_fmovecr
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jmp smovcr |fmovecr; jmp directly to emulation
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not_fmovecr:
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movew CMDREG1B(%a6),%d0
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andl #0x7F,%d0
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cmpil #0x38,%d0 |if the extension is >= $38,
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bge serror |it is illegal
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bfextu STAG(%a6){#0:#3},%d1
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lsll #3,%d0 |make room for STAG
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addl %d1,%d0 |combine for final index into table
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leal tblpre,%a1 |start of monster jump table
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movel (%a1,%d0.w*4),%a1 |real target address
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leal ETEMP(%a6),%a0 |a0 is pointer to src op
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movel USER_FPCR(%a6),%d1
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andl #0xFF,%d1 | discard all but rounding mode/prec
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fmovel #0,%fpcr
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jmp (%a1)
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| ERROR
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.global serror
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serror:
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st STORE_FLG(%a6)
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rts
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| These routines load forced values into fp0. They are called
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| by index into tbldo.
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| Load a signed zero to fp0 and set inex2/ainex
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.global snzrinx
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snzrinx:
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btstb #sign_bit,LOCAL_EX(%a0) |get sign of source operand
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bnes ld_mzinx |if negative, branch
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bsr ld_pzero |bsr so we can return and set inx
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bra t_inx2 |now, set the inx for the next inst
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ld_mzinx:
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bsr ld_mzero |if neg, load neg zero, return here
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bra t_inx2 |now, set the inx for the next inst
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| Load a signed zero to fp0; do not set inex2/ainex
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.global szero
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szero:
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btstb #sign_bit,LOCAL_EX(%a0) |get sign of source operand
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bne ld_mzero |if neg, load neg zero
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bra ld_pzero |load positive zero
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| Load a signed infinity to fp0; do not set inex2/ainex
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.global sinf
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sinf:
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btstb #sign_bit,LOCAL_EX(%a0) |get sign of source operand
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bne ld_minf |if negative branch
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bra ld_pinf
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| Load a signed one to fp0; do not set inex2/ainex
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.global sone
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sone:
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btstb #sign_bit,LOCAL_EX(%a0) |check sign of source
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bne ld_mone
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bra ld_pone
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| Load a signed pi/2 to fp0; do not set inex2/ainex
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.global spi_2
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spi_2:
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btstb #sign_bit,LOCAL_EX(%a0) |check sign of source
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bne ld_mpi2
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bra ld_ppi2
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| Load either a +0 or +inf for plus/minus operand
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.global szr_inf
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szr_inf:
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btstb #sign_bit,LOCAL_EX(%a0) |check sign of source
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bne ld_pzero
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bra ld_pinf
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| Result is either an operr or +inf for plus/minus operand
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| [Used by slogn, slognp1, slog10, and slog2]
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.global sopr_inf
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sopr_inf:
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btstb #sign_bit,LOCAL_EX(%a0) |check sign of source
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bne t_operr
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bra ld_pinf
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| FLOGNP1
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.global sslognp1
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sslognp1:
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fmovemx (%a0),%fp0-%fp0
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fcmpb #-1,%fp0
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fbgt slognp1
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fbeq t_dz2 |if = -1, divide by zero exception
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fmovel #0,%FPSR |clr N flag
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bra t_operr |take care of operands < -1
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| FETOXM1
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.global setoxm1i
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setoxm1i:
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btstb #sign_bit,LOCAL_EX(%a0) |check sign of source
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bne ld_mone
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bra ld_pinf
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| FLOGN
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| Test for 1.0 as an input argument, returning +zero. Also check
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| the sign and return operr if negative.
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.global sslogn
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sslogn:
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btstb #sign_bit,LOCAL_EX(%a0)
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bne t_operr |take care of operands < 0
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cmpiw #0x3fff,LOCAL_EX(%a0) |test for 1.0 input
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bne slogn
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cmpil #0x80000000,LOCAL_HI(%a0)
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bne slogn
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tstl LOCAL_LO(%a0)
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bne slogn
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fmovex PZERO,%fp0
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rts
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.global sslognd
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sslognd:
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btstb #sign_bit,LOCAL_EX(%a0)
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beq slognd
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bra t_operr |take care of operands < 0
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| FLOG10
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.global sslog10
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sslog10:
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btstb #sign_bit,LOCAL_EX(%a0)
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bne t_operr |take care of operands < 0
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cmpiw #0x3fff,LOCAL_EX(%a0) |test for 1.0 input
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bne slog10
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cmpil #0x80000000,LOCAL_HI(%a0)
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bne slog10
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tstl LOCAL_LO(%a0)
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bne slog10
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fmovex PZERO,%fp0
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rts
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.global sslog10d
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sslog10d:
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btstb #sign_bit,LOCAL_EX(%a0)
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beq slog10d
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bra t_operr |take care of operands < 0
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| FLOG2
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.global sslog2
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sslog2:
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btstb #sign_bit,LOCAL_EX(%a0)
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bne t_operr |take care of operands < 0
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cmpiw #0x3fff,LOCAL_EX(%a0) |test for 1.0 input
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bne slog2
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cmpil #0x80000000,LOCAL_HI(%a0)
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bne slog2
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tstl LOCAL_LO(%a0)
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bne slog2
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fmovex PZERO,%fp0
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rts
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.global sslog2d
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sslog2d:
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btstb #sign_bit,LOCAL_EX(%a0)
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beq slog2d
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bra t_operr |take care of operands < 0
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| FMOD
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pmodt:
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| ;$21 fmod
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| ;dtag,stag
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.long smod | 00,00 norm,norm = normal
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.long smod_oper | 00,01 norm,zero = nan with operr
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.long smod_fpn | 00,10 norm,inf = fpn
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.long smod_snan | 00,11 norm,nan = nan
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.long smod_zro | 01,00 zero,norm = +-zero
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.long smod_oper | 01,01 zero,zero = nan with operr
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.long smod_zro | 01,10 zero,inf = +-zero
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.long smod_snan | 01,11 zero,nan = nan
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.long smod_oper | 10,00 inf,norm = nan with operr
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.long smod_oper | 10,01 inf,zero = nan with operr
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.long smod_oper | 10,10 inf,inf = nan with operr
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.long smod_snan | 10,11 inf,nan = nan
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.long smod_dnan | 11,00 nan,norm = nan
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.long smod_dnan | 11,01 nan,zero = nan
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.long smod_dnan | 11,10 nan,inf = nan
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.long smod_dnan | 11,11 nan,nan = nan
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.global pmod
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pmod:
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clrb FPSR_QBYTE(%a6) | clear quotient field
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bfextu STAG(%a6){#0:#3},%d0 |stag = d0
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bfextu DTAG(%a6){#0:#3},%d1 |dtag = d1
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| Alias extended denorms to norms for the jump table.
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bclrl #2,%d0
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bclrl #2,%d1
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lslb #2,%d1
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orb %d0,%d1 |d1{3:2} = dtag, d1{1:0} = stag
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| ;Tag values:
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| ;00 = norm or denorm
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| ;01 = zero
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| ;10 = inf
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| ;11 = nan
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lea pmodt,%a1
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movel (%a1,%d1.w*4),%a1
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jmp (%a1)
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smod_snan:
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bra src_nan
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smod_dnan:
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bra dst_nan
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smod_oper:
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bra t_operr
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smod_zro:
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moveb ETEMP(%a6),%d1 |get sign of src op
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moveb FPTEMP(%a6),%d0 |get sign of dst op
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eorb %d0,%d1 |get exor of sign bits
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btstl #7,%d1 |test for sign
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beqs smod_zsn |if clr, do not set sign big
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bsetb #q_sn_bit,FPSR_QBYTE(%a6) |set q-byte sign bit
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smod_zsn:
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btstl #7,%d0 |test if + or -
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beq ld_pzero |if pos then load +0
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bra ld_mzero |else neg load -0
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smod_fpn:
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moveb ETEMP(%a6),%d1 |get sign of src op
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moveb FPTEMP(%a6),%d0 |get sign of dst op
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eorb %d0,%d1 |get exor of sign bits
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btstl #7,%d1 |test for sign
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beqs smod_fsn |if clr, do not set sign big
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bsetb #q_sn_bit,FPSR_QBYTE(%a6) |set q-byte sign bit
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smod_fsn:
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tstb DTAG(%a6) |filter out denormal destination case
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bpls smod_nrm |
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leal FPTEMP(%a6),%a0 |a0<- addr(FPTEMP)
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bra t_resdnrm |force UNFL(but exact) result
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smod_nrm:
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fmovel USER_FPCR(%a6),%fpcr |use user's rmode and precision
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fmovex FPTEMP(%a6),%fp0 |return dest to fp0
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rts
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| FREM
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premt:
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| ;$25 frem
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| ;dtag,stag
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.long srem | 00,00 norm,norm = normal
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.long srem_oper | 00,01 norm,zero = nan with operr
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.long srem_fpn | 00,10 norm,inf = fpn
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.long srem_snan | 00,11 norm,nan = nan
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.long srem_zro | 01,00 zero,norm = +-zero
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.long srem_oper | 01,01 zero,zero = nan with operr
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.long srem_zro | 01,10 zero,inf = +-zero
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.long srem_snan | 01,11 zero,nan = nan
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.long srem_oper | 10,00 inf,norm = nan with operr
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.long srem_oper | 10,01 inf,zero = nan with operr
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.long srem_oper | 10,10 inf,inf = nan with operr
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.long srem_snan | 10,11 inf,nan = nan
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.long srem_dnan | 11,00 nan,norm = nan
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.long srem_dnan | 11,01 nan,zero = nan
|
||
|
|
.long srem_dnan | 11,10 nan,inf = nan
|
||
|
|
.long srem_dnan | 11,11 nan,nan = nan
|
||
|
|
|
||
|
|
.global prem
|
||
|
|
prem:
|
||
|
|
clrb FPSR_QBYTE(%a6) |clear quotient field
|
||
|
|
bfextu STAG(%a6){#0:#3},%d0 |stag = d0
|
||
|
|
bfextu DTAG(%a6){#0:#3},%d1 |dtag = d1
|
||
|
|
|
|
||
|
|
| Alias extended denorms to norms for the jump table.
|
||
|
|
|
|
||
|
|
bclr #2,%d0
|
||
|
|
bclr #2,%d1
|
||
|
|
|
||
|
|
lslb #2,%d1
|
||
|
|
orb %d0,%d1 |d1{3:2} = dtag, d1{1:0} = stag
|
||
|
|
| ;Tag values:
|
||
|
|
| ;00 = norm or denorm
|
||
|
|
| ;01 = zero
|
||
|
|
| ;10 = inf
|
||
|
|
| ;11 = nan
|
||
|
|
lea premt,%a1
|
||
|
|
movel (%a1,%d1.w*4),%a1
|
||
|
|
jmp (%a1)
|
||
|
|
|
||
|
|
srem_snan:
|
||
|
|
bra src_nan
|
||
|
|
srem_dnan:
|
||
|
|
bra dst_nan
|
||
|
|
srem_oper:
|
||
|
|
bra t_operr
|
||
|
|
srem_zro:
|
||
|
|
moveb ETEMP(%a6),%d1 |get sign of src op
|
||
|
|
moveb FPTEMP(%a6),%d0 |get sign of dst op
|
||
|
|
eorb %d0,%d1 |get exor of sign bits
|
||
|
|
btstl #7,%d1 |test for sign
|
||
|
|
beqs srem_zsn |if clr, do not set sign big
|
||
|
|
bsetb #q_sn_bit,FPSR_QBYTE(%a6) |set q-byte sign bit
|
||
|
|
srem_zsn:
|
||
|
|
btstl #7,%d0 |test if + or -
|
||
|
|
beq ld_pzero |if pos then load +0
|
||
|
|
bra ld_mzero |else neg load -0
|
||
|
|
|
||
|
|
srem_fpn:
|
||
|
|
moveb ETEMP(%a6),%d1 |get sign of src op
|
||
|
|
moveb FPTEMP(%a6),%d0 |get sign of dst op
|
||
|
|
eorb %d0,%d1 |get exor of sign bits
|
||
|
|
btstl #7,%d1 |test for sign
|
||
|
|
beqs srem_fsn |if clr, do not set sign big
|
||
|
|
bsetb #q_sn_bit,FPSR_QBYTE(%a6) |set q-byte sign bit
|
||
|
|
srem_fsn:
|
||
|
|
tstb DTAG(%a6) |filter out denormal destination case
|
||
|
|
bpls srem_nrm |
|
||
|
|
leal FPTEMP(%a6),%a0 |a0<- addr(FPTEMP)
|
||
|
|
bra t_resdnrm |force UNFL(but exact) result
|
||
|
|
srem_nrm:
|
||
|
|
fmovel USER_FPCR(%a6),%fpcr |use user's rmode and precision
|
||
|
|
fmovex FPTEMP(%a6),%fp0 |return dest to fp0
|
||
|
|
rts
|
||
|
|
|
|
||
|
|
| FSCALE
|
||
|
|
|
|
||
|
|
pscalet:
|
||
|
|
| ;$26 fscale
|
||
|
|
| ;dtag,stag
|
||
|
|
.long sscale | 00,00 norm,norm = result
|
||
|
|
.long sscale | 00,01 norm,zero = fpn
|
||
|
|
.long scl_opr | 00,10 norm,inf = nan with operr
|
||
|
|
.long scl_snan | 00,11 norm,nan = nan
|
||
|
|
.long scl_zro | 01,00 zero,norm = +-zero
|
||
|
|
.long scl_zro | 01,01 zero,zero = +-zero
|
||
|
|
.long scl_opr | 01,10 zero,inf = nan with operr
|
||
|
|
.long scl_snan | 01,11 zero,nan = nan
|
||
|
|
.long scl_inf | 10,00 inf,norm = +-inf
|
||
|
|
.long scl_inf | 10,01 inf,zero = +-inf
|
||
|
|
.long scl_opr | 10,10 inf,inf = nan with operr
|
||
|
|
.long scl_snan | 10,11 inf,nan = nan
|
||
|
|
.long scl_dnan | 11,00 nan,norm = nan
|
||
|
|
.long scl_dnan | 11,01 nan,zero = nan
|
||
|
|
.long scl_dnan | 11,10 nan,inf = nan
|
||
|
|
.long scl_dnan | 11,11 nan,nan = nan
|
||
|
|
|
||
|
|
.global pscale
|
||
|
|
pscale:
|
||
|
|
bfextu STAG(%a6){#0:#3},%d0 |stag in d0
|
||
|
|
bfextu DTAG(%a6){#0:#3},%d1 |dtag in d1
|
||
|
|
bclrl #2,%d0 |alias denorm into norm
|
||
|
|
bclrl #2,%d1 |alias denorm into norm
|
||
|
|
lslb #2,%d1
|
||
|
|
orb %d0,%d1 |d1{4:2} = dtag, d1{1:0} = stag
|
||
|
|
| ;dtag values stag values:
|
||
|
|
| ;000 = norm 00 = norm
|
||
|
|
| ;001 = zero 01 = zero
|
||
|
|
| ;010 = inf 10 = inf
|
||
|
|
| ;011 = nan 11 = nan
|
||
|
|
| ;100 = dnrm
|
||
|
|
|
|
||
|
|
|
|
||
|
|
leal pscalet,%a1 |load start of jump table
|
||
|
|
movel (%a1,%d1.w*4),%a1 |load a1 with label depending on tag
|
||
|
|
jmp (%a1) |go to the routine
|
||
|
|
|
||
|
|
scl_opr:
|
||
|
|
bra t_operr
|
||
|
|
|
||
|
|
scl_dnan:
|
||
|
|
bra dst_nan
|
||
|
|
|
||
|
|
scl_zro:
|
||
|
|
btstb #sign_bit,FPTEMP_EX(%a6) |test if + or -
|
||
|
|
beq ld_pzero |if pos then load +0
|
||
|
|
bra ld_mzero |if neg then load -0
|
||
|
|
scl_inf:
|
||
|
|
btstb #sign_bit,FPTEMP_EX(%a6) |test if + or -
|
||
|
|
beq ld_pinf |if pos then load +inf
|
||
|
|
bra ld_minf |else neg load -inf
|
||
|
|
scl_snan:
|
||
|
|
bra src_nan
|
||
|
|
|
|
||
|
|
| FSINCOS
|
||
|
|
|
|
||
|
|
.global ssincosz
|
||
|
|
ssincosz:
|
||
|
|
btstb #sign_bit,ETEMP(%a6) |get sign
|
||
|
|
beqs sincosp
|
||
|
|
fmovex MZERO,%fp0
|
||
|
|
bras sincoscom
|
||
|
|
sincosp:
|
||
|
|
fmovex PZERO,%fp0
|
||
|
|
sincoscom:
|
||
|
|
fmovemx PONE,%fp1-%fp1 |do not allow FPSR to be affected
|
||
|
|
bra sto_cos |store cosine result
|
||
|
|
|
||
|
|
.global ssincosi
|
||
|
|
ssincosi:
|
||
|
|
fmovex QNAN,%fp1 |load NAN
|
||
|
|
bsr sto_cos |store cosine result
|
||
|
|
fmovex QNAN,%fp0 |load NAN
|
||
|
|
bra t_operr
|
||
|
|
|
||
|
|
.global ssincosnan
|
||
|
|
ssincosnan:
|
||
|
|
movel ETEMP_EX(%a6),FP_SCR1(%a6)
|
||
|
|
movel ETEMP_HI(%a6),FP_SCR1+4(%a6)
|
||
|
|
movel ETEMP_LO(%a6),FP_SCR1+8(%a6)
|
||
|
|
bsetb #signan_bit,FP_SCR1+4(%a6)
|
||
|
|
fmovemx FP_SCR1(%a6),%fp1-%fp1
|
||
|
|
bsr sto_cos
|
||
|
|
bra src_nan
|
||
|
|
|
|
||
|
|
| This code forces default values for the zero, inf, and nan cases
|
||
|
|
| in the transcendentals code. The CC bits must be set in the
|
||
|
|
| stacked FPSR to be correctly reported.
|
||
|
|
|
|
||
|
|
|**Returns +PI/2
|
||
|
|
.global ld_ppi2
|
||
|
|
ld_ppi2:
|
||
|
|
fmovex PPIBY2,%fp0 |load +pi/2
|
||
|
|
bra t_inx2 |set inex2 exc
|
||
|
|
|
||
|
|
|**Returns -PI/2
|
||
|
|
.global ld_mpi2
|
||
|
|
ld_mpi2:
|
||
|
|
fmovex MPIBY2,%fp0 |load -pi/2
|
||
|
|
orl #neg_mask,USER_FPSR(%a6) |set N bit
|
||
|
|
bra t_inx2 |set inex2 exc
|
||
|
|
|
||
|
|
|**Returns +inf
|
||
|
|
.global ld_pinf
|
||
|
|
ld_pinf:
|
||
|
|
fmovex PINF,%fp0 |load +inf
|
||
|
|
orl #inf_mask,USER_FPSR(%a6) |set I bit
|
||
|
|
rts
|
||
|
|
|
||
|
|
|**Returns -inf
|
||
|
|
.global ld_minf
|
||
|
|
ld_minf:
|
||
|
|
fmovex MINF,%fp0 |load -inf
|
||
|
|
orl #neg_mask+inf_mask,USER_FPSR(%a6) |set N and I bits
|
||
|
|
rts
|
||
|
|
|
||
|
|
|**Returns +1
|
||
|
|
.global ld_pone
|
||
|
|
ld_pone:
|
||
|
|
fmovex PONE,%fp0 |load +1
|
||
|
|
rts
|
||
|
|
|
||
|
|
|**Returns -1
|
||
|
|
.global ld_mone
|
||
|
|
ld_mone:
|
||
|
|
fmovex MONE,%fp0 |load -1
|
||
|
|
orl #neg_mask,USER_FPSR(%a6) |set N bit
|
||
|
|
rts
|
||
|
|
|
||
|
|
|**Returns +0
|
||
|
|
.global ld_pzero
|
||
|
|
ld_pzero:
|
||
|
|
fmovex PZERO,%fp0 |load +0
|
||
|
|
orl #z_mask,USER_FPSR(%a6) |set Z bit
|
||
|
|
rts
|
||
|
|
|
||
|
|
|**Returns -0
|
||
|
|
.global ld_mzero
|
||
|
|
ld_mzero:
|
||
|
|
fmovex MZERO,%fp0 |load -0
|
||
|
|
orl #neg_mask+z_mask,USER_FPSR(%a6) |set N and Z bits
|
||
|
|
rts
|
||
|
|
|
||
|
|
|end
|