| This file contains routines used by other programs.
|
| ovf_res: used by overflow to force the correct
-| result. ovf_r_k, ovf_r_x2, ovf_r_x3 are
+| result. ovf_r_k, ovf_r_x2, ovf_r_x3 are
| derivatives of this routine.
| get_fline: get user's opcode word
| g_dfmtou: returns the destination format.
| g_opcls: returns the opclass of the float instruction.
-| g_rndpr: returns the rounding precision.
+| g_rndpr: returns the rounding precision.
| reg_dest: write byte, word, or long data to Dn
|
|
| Copyright (C) Motorola, Inc. 1990
| All Rights Reserved
|
-| THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA
-| The copyright notice above does not evidence any
+| THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA
+| The copyright notice above does not evidence any
| actual or intended publication of such source code.
|UTIL idnt 2,1 | Motorola 040 Floating Point Software Package
| are unnecessary as ovf_res always returns the sign separately from
| the exponent.
| ;+inf
-EXT_PINF: .long 0x7fff0000,0x00000000,0x00000000,0x00000000
+EXT_PINF: .long 0x7fff0000,0x00000000,0x00000000,0x00000000
| ;largest +ext
-EXT_PLRG: .long 0x7ffe0000,0xffffffff,0xffffffff,0x00000000
+EXT_PLRG: .long 0x7ffe0000,0xffffffff,0xffffffff,0x00000000
| ;largest magnitude +sgl in ext
-SGL_PLRG: .long 0x407e0000,0xffffff00,0x00000000,0x00000000
+SGL_PLRG: .long 0x407e0000,0xffffff00,0x00000000,0x00000000
| ;largest magnitude +dbl in ext
-DBL_PLRG: .long 0x43fe0000,0xffffffff,0xfffff800,0x00000000
+DBL_PLRG: .long 0x43fe0000,0xffffffff,0xfffff800,0x00000000
| ;largest -ext
tblovfl:
|
| ovf_r_k --- overflow result calculation
|
-| This entry point is used by kernel_ex.
+| This entry point is used by kernel_ex.
|
| This forces the destination precision to be extended
|
|
.global ovf_r_k
ovf_r_k:
- lea ETEMP(%a6),%a0 |a0 points to source operand
+ lea ETEMP(%a6),%a0 |a0 points to source operand
bclrb #sign_bit,ETEMP_EX(%a6)
sne ETEMP_SGN(%a6) |convert to internal IEEE format
beql ovff_dbl |force precision is double
movew CMDREG3B(%a6),%d0 |get the command word again
andil #0x7f,%d0 |clear all except operation
- cmpil #0x33,%d0
+ cmpil #0x33,%d0
beql ovf_fsgl |fsglmul or fsgldiv
cmpil #0x30,%d0
- beql ovf_fsgl
+ beql ovf_fsgl
bra ovf_fpcr |instruction is none of the above
| ;use FPCR
ovf_e1_exc:
andil #0x0000007f,%d0 |clear all except the op code
cmpil #0x00000027,%d0
beql ovf_fsgl |fsglmul
- cmpil #0x00000024,%d0
+ cmpil #0x00000024,%d0
beql ovf_fsgl |fsgldiv
bra ovf_fpcr |none of the above, use FPCR
-|
+|
|
| Inst is either fsgldiv or fsglmul. Force extended precision.
|
ovf_fpcr:
bfextu FPCR_MODE(%a6){#0:#2},%d0 |set round precision
bra ovf_res
-
+
|
|
| ovf_r_x3 --- overflow result calculation
| ovf_res --- overflow result calculation
|
| Input:
-| a0 points to operand in internal extended format
+| a0 points to operand in internal extended format
| Output:
-| a0 points to result in internal extended format
+| a0 points to result in internal extended format
|
.global ovf_res
ovf_res:
EXT_RN:
leal EXT_PINF,%a1 |answer is +/- infinity
bsetb #inf_bit,FPSR_CC(%a6)
- bra set_sign |now go set the sign
+ bra set_sign |now go set the sign
EXT_RZ:
leal EXT_PLRG,%a1 |answer is +/- large number
bra set_sign |now go set the sign
movel (%a7)+,%d0
rts
|
-| g_rndpr --- put rounding precision in d0{1:0}
-|
+| g_rndpr --- put rounding precision in d0{1:0}
+|
| valid return codes are:
-| 00 - extended
+| 00 - extended
| 01 - single
| 10 - double
|
| For move out instructions (opclass 011) the destination format
| is the same as the rounding precision. Pass results from g_dfmtou.
|
- bsr g_dfmtou
+ bsr g_dfmtou
rts
op_0x0:
btstb #E3,E_BYTE(%a6)
beql unff_dbl
movew CMDREG3B(%a6),%d0 |get the command word again
andil #0x7f,%d0 |clear all except operation
- cmpil #0x33,%d0
+ cmpil #0x33,%d0
beql unf_fsgl |fsglmul or fsgldiv
cmpil #0x30,%d0
beql unf_fsgl |fsgldiv or fsglmul
| Force extended
|
unf_fsgl:
- movel #0,%d0
+ movel #0,%d0
rts
|
| Get rounding precision set in FPCR{7:6}.
| If E1, the format is from cmdreg1b{12:10}
| If E3, the format is extended.
|
-| Dest. Fmt.
+| Dest. Fmt.
| extended 010 -> 00
| single 001 -> 01
| double 101 -> 10
| are unnecessary as unf_sub always returns the sign separately from
| the exponent.
| ;+zero
-EXT_PZRO: .long 0x00000000,0x00000000,0x00000000,0x00000000
+EXT_PZRO: .long 0x00000000,0x00000000,0x00000000,0x00000000
| ;+zero
-SGL_PZRO: .long 0x3f810000,0x00000000,0x00000000,0x00000000
+SGL_PZRO: .long 0x3f810000,0x00000000,0x00000000,0x00000000
| ;+zero
-DBL_PZRO: .long 0x3c010000,0x00000000,0x00000000,0x00000000
+DBL_PZRO: .long 0x3c010000,0x00000000,0x00000000,0x00000000
| ;smallest +ext denorm
-EXT_PSML: .long 0x00000000,0x00000000,0x00000001,0x00000000
+EXT_PSML: .long 0x00000000,0x00000000,0x00000001,0x00000000
| ;smallest +sgl denorm
-SGL_PSML: .long 0x3f810000,0x00000100,0x00000000,0x00000000
+SGL_PSML: .long 0x3f810000,0x00000100,0x00000000,0x00000000
| ;smallest +dbl denorm
-DBL_PSML: .long 0x3c010000,0x00000000,0x00000800,0x00000000
+DBL_PSML: .long 0x3c010000,0x00000000,0x00000800,0x00000000
|
| UNF_SUB --- underflow result calculation
|
| Input:
-| d0 contains round precision
+| d0 contains round precision
| a0 points to input operand in the internal extended format
|
| Output:
-| a0 points to correct internal extended precision result.
+| a0 points to correct internal extended precision result.
|
tblunf:
uEXT_RN:
leal EXT_PZRO,%a1 |answer is +/- zero
bsetb #z_bit,FPSR_CC(%a6)
- bra uset_sign |now go set the sign
+ bra uset_sign |now go set the sign
uEXT_RZ:
leal EXT_PZRO,%a1 |answer is +/- zero
bsetb #z_bit,FPSR_CC(%a6)
|
|
| Input:
-| L_SCR1: Data
+| L_SCR1: Data
| d1: data size and dest register number formatted as:
|
| 32 5 4 3 2 1 0
git://git.onelab.eu / linux-2.6.git / blobdiff