Method and apparatus for obtaining a scalar value directly from a vector register
First Claim
1. An information processor, including a decoder for decoding instructions including at least some graphics instructions and at least one paired singles instruction, wherein the decoder is operable to decode a 32-bit paired-single-scalar-vector-multiply-add-high (ps_madds0x) instruction wherein a high order word of a paired singles register is used as a scalar, and further wherein the ps_madds0x instruction includes bits 0 through 31, wherein bits 0-5 encode a primary op code of 4, bits 6-10 designate a floating point destination register for storing the results of the instruction, bits 11-15 designate a first floating point register as a first source storing a first pair of 32-bit single-precision floating point values, bits 16-20 designate a second floating point register as a second source storing a second pair of 32-bit single-precision floating point values, bits 21-25 designate a third floating point register as a third source storing a third pair of 32-bit single-precision floating point values, bits 26-30 encode a secondary op code of 14 and bit 31 comprises a record bit indicating updating of a condition register, and further wherein the secondary op code indicates that the high order word is to be used as the scalar.
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Abstract
A method and apparatus for obtaining a scalar value from a vector register for use in a mixed vector and scalar instruction, including providing a vector in a vector register file, and embedding a location identifier of the scalar value within the vector in the bits defining the mixed vector and scalar instruction. The scalar value can be used directly from the vector register without the need to load the scalar to a scalar register prior to executing the instruction. The scalar location identifier may be embedded in the secondary op code of the instruction, or the instruction may have dedicated bits for providing the location of the scalar within the vector.
243 Citations
9 Claims
- 1. An information processor, including a decoder for decoding instructions including at least some graphics instructions and at least one paired singles instruction, wherein the decoder is operable to decode a 32-bit paired-single-scalar-vector-multiply-add-high (ps_madds0x) instruction wherein a high order word of a paired singles register is used as a scalar, and further wherein the ps_madds0x instruction includes bits 0 through 31, wherein bits 0-5 encode a primary op code of 4, bits 6-10 designate a floating point destination register for storing the results of the instruction, bits 11-15 designate a first floating point register as a first source storing a first pair of 32-bit single-precision floating point values, bits 16-20 designate a second floating point register as a second source storing a second pair of 32-bit single-precision floating point values, bits 21-25 designate a third floating point register as a third source storing a third pair of 32-bit single-precision floating point values, bits 26-30 encode a secondary op code of 14 and bit 31 comprises a record bit indicating updating of a condition register, and further wherein the secondary op code indicates that the high order word is to be used as the scalar.
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4. A decoder for decoding instructions including at least some graphics instructions, wherein the decoder is operable to decode:
a 32-bit paired-single-scalar-vector-multiply-add-high (ps_madds0x) instruction wherein a high order word of a paired singles register is used as a scalar, and further wherein the ps_madds0x instruction includes bits 0 through 31, wherein bits 0-5 encode a primary op code of 4, bits 6-10 designate a floating point destination register for storing the results of the instruction, bits 11-15 designate a first floating point register as a first source storing a first pair of 32-bit single-precision floating point values, bits 16-20 designate a second floating point register as a second source storing a second pair of 32-bit single-precision floating point values, bits 21-25 designate a third floating point register as a third source storing a third pair of 32-bit single-precision floating point values, bits 26-30 encode a secondary op code of 14 and bit 31 comprises a record bit indicating updating of a condition register, and further wherein the secondary op code indicates that the high order word is to be used as the scalar. - View Dependent Claims (5, 6)
- 7. A storage medium storing a plurality of instructions including at least some graphics instructions and a 32-bit paired-single-scalar-vector-multiply-add-high (ps_madds0x) instruction wherein a high order word of a paired singles register is used as a scalar, and further wherein the ps_madds0x instruction includes bits 0 through 31, wherein bits 0-5 encode a primary op code of 4, bits 6-10 designate a floating point destination register for storing the results of the instruction, bits 11-15 designate a first floating point register as a first source storing a first pair of 32-bit single-precision floating point values, bits 16-20 designate a second floating point register as a secondsource storing a second pair of 32-bit single-precision floating point values, bits 21-25 designate a third floating point register as a third source storing a third pair of 32-bit single-precision floating point values, bits 26-30 encode a secondary op code of 14 and bit 31 comprises a record bit indicating updating of a condition register, and further wherein the secondary op code indicates that the high order word is to be used as the scalar.
Specification