Vol. 1 4-9
DATA TYPES
4.7
BCD AND PACKED BCD INTEGERS
Binary-coded decimal integers (BCD integers) are unsigned 4-bit integers with valid values ranging from 0 to 9. IA-
32 architecture defines operations on BCD integers located in one or more general-purpose registers or in one or
more x87 FPU registers (see Figure 4-9).
Figure 4-8. 128-Bit Packed SIMD Data Types
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127
Packed Words
Packed Bytes
Packed Doublewords
Packed Word Integers
Packed Byte Integers
Packed Doubleword Integers
Fundamental 128-Bit Packed SIMD Data Types
128-Bit Packed Floating-Point and Integer Data Types
Packed Quadwords
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127
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127
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127
0
127
0
127
0
127
0
127
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127
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127
Packed Quadword Integers
Packed Single Precision
Floating Point
Packed Double Precision
Floating Point