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Diffstat (limited to 'ANDROID_3.4.5/arch/m68k/fpsp040/binstr.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/m68k/fpsp040/binstr.S | 139 |
1 files changed, 0 insertions, 139 deletions
diff --git a/ANDROID_3.4.5/arch/m68k/fpsp040/binstr.S b/ANDROID_3.4.5/arch/m68k/fpsp040/binstr.S deleted file mode 100644 index 8a05ba92..00000000 --- a/ANDROID_3.4.5/arch/m68k/fpsp040/binstr.S +++ /dev/null @@ -1,139 +0,0 @@ -| -| binstr.sa 3.3 12/19/90 -| -| -| Description: Converts a 64-bit binary integer to bcd. -| -| Input: 64-bit binary integer in d2:d3, desired length (LEN) in -| d0, and a pointer to start in memory for bcd characters -| in d0. (This pointer must point to byte 4 of the first -| lword of the packed decimal memory string.) -| -| Output: LEN bcd digits representing the 64-bit integer. -| -| Algorithm: -| The 64-bit binary is assumed to have a decimal point before -| bit 63. The fraction is multiplied by 10 using a mul by 2 -| shift and a mul by 8 shift. The bits shifted out of the -| msb form a decimal digit. This process is iterated until -| LEN digits are formed. -| -| A1. Init d7 to 1. D7 is the byte digit counter, and if 1, the -| digit formed will be assumed the least significant. This is -| to force the first byte formed to have a 0 in the upper 4 bits. -| -| A2. Beginning of the loop: -| Copy the fraction in d2:d3 to d4:d5. -| -| A3. Multiply the fraction in d2:d3 by 8 using bit-field -| extracts and shifts. The three msbs from d2 will go into -| d1. -| -| A4. Multiply the fraction in d4:d5 by 2 using shifts. The msb -| will be collected by the carry. -| -| A5. Add using the carry the 64-bit quantities in d2:d3 and d4:d5 -| into d2:d3. D1 will contain the bcd digit formed. -| -| A6. Test d7. If zero, the digit formed is the ms digit. If non- -| zero, it is the ls digit. Put the digit in its place in the -| upper word of d0. If it is the ls digit, write the word -| from d0 to memory. -| -| A7. Decrement d6 (LEN counter) and repeat the loop until zero. -| -| Implementation Notes: -| -| The registers are used as follows: -| -| d0: LEN counter -| d1: temp used to form the digit -| d2: upper 32-bits of fraction for mul by 8 -| d3: lower 32-bits of fraction for mul by 8 -| d4: upper 32-bits of fraction for mul by 2 -| d5: lower 32-bits of fraction for mul by 2 -| d6: temp for bit-field extracts -| d7: byte digit formation word;digit count {0,1} -| a0: pointer into memory for packed bcd string formation -| - -| 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. - -|BINSTR idnt 2,1 | Motorola 040 Floating Point Software Package - - |section 8 - -#include "fpsp.h" - - .global binstr -binstr: - moveml %d0-%d7,-(%a7) -| -| A1: Init d7 -| - moveql #1,%d7 |init d7 for second digit - subql #1,%d0 |for dbf d0 would have LEN+1 passes -| -| A2. Copy d2:d3 to d4:d5. Start loop. -| -loop: - movel %d2,%d4 |copy the fraction before muls - movel %d3,%d5 |to d4:d5 -| -| A3. Multiply d2:d3 by 8; extract msbs into d1. -| - bfextu %d2{#0:#3},%d1 |copy 3 msbs of d2 into d1 - asll #3,%d2 |shift d2 left by 3 places - bfextu %d3{#0:#3},%d6 |copy 3 msbs of d3 into d6 - asll #3,%d3 |shift d3 left by 3 places - orl %d6,%d2 |or in msbs from d3 into d2 -| -| A4. Multiply d4:d5 by 2; add carry out to d1. -| - asll #1,%d5 |mul d5 by 2 - roxll #1,%d4 |mul d4 by 2 - swap %d6 |put 0 in d6 lower word - addxw %d6,%d1 |add in extend from mul by 2 -| -| A5. Add mul by 8 to mul by 2. D1 contains the digit formed. -| - addl %d5,%d3 |add lower 32 bits - nop |ERRATA ; FIX #13 (Rev. 1.2 6/6/90) - addxl %d4,%d2 |add with extend upper 32 bits - nop |ERRATA ; FIX #13 (Rev. 1.2 6/6/90) - addxw %d6,%d1 |add in extend from add to d1 - swap %d6 |with d6 = 0; put 0 in upper word -| -| A6. Test d7 and branch. -| - tstw %d7 |if zero, store digit & to loop - beqs first_d |if non-zero, form byte & write -sec_d: - swap %d7 |bring first digit to word d7b - aslw #4,%d7 |first digit in upper 4 bits d7b - addw %d1,%d7 |add in ls digit to d7b - moveb %d7,(%a0)+ |store d7b byte in memory - swap %d7 |put LEN counter in word d7a - clrw %d7 |set d7a to signal no digits done - dbf %d0,loop |do loop some more! - bras end_bstr |finished, so exit -first_d: - swap %d7 |put digit word in d7b - movew %d1,%d7 |put new digit in d7b - swap %d7 |put LEN counter in word d7a - addqw #1,%d7 |set d7a to signal first digit done - dbf %d0,loop |do loop some more! - swap %d7 |put last digit in string - lslw #4,%d7 |move it to upper 4 bits - moveb %d7,(%a0)+ |store it in memory string -| -| Clean up and return with result in fp0. -| -end_bstr: - moveml (%a7)+,%d0-%d7 - rts - |end |