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Assembly Language
table operations
summary
This web page examines table instructions in assembly language. Specific examples of instructions from various processors are used to illustrate the general nature of assembly language.
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table operations
- TBLS Table Lookup and Interpolate (Signed, Rounded); Motorola 68300; signed lookup and interpolation of independent variable X from a compressed linear data table or between two register-based table entries of linear representations of dependent variable Y as a function of X; ENTRY(n) + {(ENTRY(n+1) - ENTRY(n)) * Dx[7:0]} / 256 into Dx; table version: data register low word contains the independent variable X, 8-bit integer part and 8-bit fractional part with assumed radix point located between bits 7 and 8, source effective address points to beginning of table in memory, integer part scaled to data size (byte, word, or longword) and used as offset from beginning of table, selected table entry (a linear representation of dependent variable Y) is subtracted from the next consecutive table entry, then multiplied by the interpolation fraction, then divided by 256, then added to the first table entry, and then stored in the data register; register version: data register low byte contains the independent variable X 8-bit fractional part with assumed radix point located between bits 7 and 8, two data registers contain the byte, word, or longword table entries (a linear representation of dependent variable Y), first data register-based table entry is subtracted from the second data register-based table entry, then multiplied by the interpolation fraction, then divided by 256, then added to the first table entry, and then stored in the destination (X) data register, the register interpolation mode may be used with several table lookup and interpolations to model multidimentional functions; rounding is selected by the ‘R’ instruction field, for a rounding adjustment of -1, 0, or +1; the result is an 8-, 16-, or 24-bit integer and eight-bit fraction; interpolation resolution is limited to 1/256th the distance between consecutrive table entries, X should be considered an integer in the range 0
X 65535; sets or clears flags
- TBLSN Table Lookup and Interpolate (Signed, Not Rounded); Motorola 68300; signed lookup and interpolation of independent variable X from a compressed linear data table or between two register-based table entries of linear representations of dependent variable Y as a function of X; ENTRY(n) * 256 + (ENTRY(n+1) - ENTRY(n)) * Dx[7:0] into Dx; table version: data register low word contains the independent variable X, 8-bit integer part and 8-bit fractional part with assumed radix point located between bits 7 and 8, source effective address points to beginning of table in memory, integer part scaled to data size (byte, word, or longword) and used as offset from beginning of table, selected table entry (a linear representation of dependent variable Y) multiplied by 256, then added to the value determined by (selected table entry subtracted from the next consecutive table entry, then multiplied by the interpolation fraction), and then stored in the data register; register version: data register low byte contains the independent variable X 8-bit fractional part with assumed radix point located between bits 7 and 8, two data registers contain the byte, word, or longword table entries (a linear representation of dependent variable Y), first data register-based table entry is multiplied by 256, then added to the value determined by (first data register-based table entry subtracted from the second data register-based table entry, then multiplied by the interpolation fraction), and then stored in the destination (X) data register, the register interpolation mode may be used with several table lookup and interpolations to model multidimentional functions; the result is an 8-, 16-, or 24-bit integer and eight-bit fraction; interpolation resolution is limited to 1/256th the distance between consecutrive table entries, X should be considered an integer in the range 0 X 65535; sets or clears flags
- TBLU Table Lookup and Interpolate (Unsigned, Rounded); Motorola 68300; unsigned lookup and interpolation of independent variable X from a compressed linear data table or between two register-based table entries of linear representations of dependent variable Y as a function of X; ENTRY(n) + {(ENTRY(n+1) - ENTRY(n)) * Dx[7:0]} / 256 into Dx; table version: data register low word contains the independent variable X, 8-bit integer part and 8-bit fractional part with assumed radix point located between bits 7 and 8, source effective address points to beginning of table in memory, integer part scaled to data size (byte, word, or longword) and used as offset from beginning of table, selected table entry (a linear representation of dependent variable Y) is subtracted from the next consecutive table entry, then multiplied by the interpolation fraction, then divided by 256, then added to the first table entry, and then stored in the data register; register version: data register low byte contains the independent variable X 8-bit fractional part with assumed radix point located between bits 7 and 8, two data registers contain the byte, word, or longword table entries (a linear representation of dependent variable Y), first data register-based table entry is subtracted from the second data register-based table entry, then multiplied by the interpolation fraction, then divided by 256, then added to the first table entry, and then stored in the destination (X) data register, the register interpolation mode may be used with several table lookup and interpolations to model multidimentional functions; rounding is selected by the ‘R’ instruction field, for a rounding adjustment of 0 or +1; the result is an 8-, 16-, or 24-bit integer and eight-bit fraction; interpolation resolution is limited to 1/256th the distance between consecutrive table entries, X should be considered an integer in the range 0 X 65535; sets or clears flags
- TBLUN Table Lookup and Interpolate (Unsigned, Not Rounded); Motorola 68300; unsigned lookup and interpolation of independent variable X from a compressed linear data table or between two register-based table entries of linear representations of dependent variable Y as a function of X; ENTRY(n) * 256 + (ENTRY(n+1) - ENTRY(n)) * Dx[7:0] into Dx; table version: data register low word contains the independent variable X, 8-bit integer part and 8-bit fractional part with assumed radix point located between bits 7 and 8, source effective address points to beginning of table in memory, integer part scaled to data size (byte, word, or longword) and used as offset from beginning of table, selected table entry (a linear representation of dependent variable Y) multiplied by 256, then added to the value determined by (selected table entry subtracted from the next consecutive table entry, then multiplied by the interpolation fraction), and then stored in the data register; register version: data register low byte contains the independent variable X 8-bit fractional part with assumed radix point located between bits 7 and 8, two data registers contain the byte, word, or longword table entries (a linear representation of dependent variable Y), first data register-based table entry is multiplied by 256, then added to the value determined by (first data register-based table entry subtracted from the second data register-based table entry, then multiplied by the interpolation fraction), and then stored in the destination (X) data register, the register interpolation mode may be used with several table lookup and interpolations to model multidimentional functions; the result is an 8-, 16-, or 24-bit integer and eight-bit fraction; interpolation resolution is limited to 1/256th the distance between consecutrive table entries, X should be considered an integer in the range 0 X 65535; sets or clears flags
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Created: February 21, 2001 (from machcode.htm)
Last Updated: March 4, 2001
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