COE 308 - Storage - language.SPACE DirectiveAllocates...

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Sets aside storage in memory for a variable May optionally assign a name (label) to the data Syntax: [ name: ] directive initializer [, initializer ] . . . .BYTE DirectiveStores the list of values as 8-bit bytes .HALF DirectiveStores the list as 16-bit values aligned on half-word boundary .WORD DirectiveStores the list as 32-bit values aligned on a word boundary .FLOAT DirectiveStores the listed values as single-precision floating point .DOUBLE DirectiveStores the listed values as double-precision floating point .ASCII DirectiveAllocates a sequence of bytes for an ASCII string .ASCIIZ DirectiveSame as .ASCII directive, but adds a NULL char at end of string Strings are null-terminated, as in the C programming
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Unformatted text preview: language .SPACE DirectiveAllocates space of n uninitialized bytes in the data segment .DATA var1: .BYTE var2: .HALF var3: .WORD var4: .FLOAT var5: .DOUBLE 1.5e-10 str1: .ASCII str2: .ASCIIZ array: .SPACE "A String\n" "NULL Terminated String" 100 'A', 'E', 127, -1, '\n'-10, 0xffff 0x12345678 12.3, -0.1 Memory is viewed as an array of bytes with addresses Byte Addressing: address points to a byte in memory Words occupy 4 consecutive bytes in memory MIPS instructions and integers occupy 4 bytes Alignment: address is a multiple of size Word address should be a multiple of 4 Least significant 2 bits of address should be 00 Halfword address should be a multiple of 2 .ALIGN n directive...
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