The immediate value, (imm), is 16-bits and is sign-extended to 32 bits before comparison. 16-bit halfword: lh and sh 2. be using, Cebollita, 8-bit byte: lb and sb Comparison Instructions Arithmetic Instructions . Instruction Example Meaning Comments; add: add $1,$2,$3: $1=$2+$3: Always 3 operands: subtract: sub $1,$2,$3: $1=$2-$3: Always 3 operands: add immediate: … For the moment, we'll only roughly follow some of the conventions. Use a Set instruction followed by a conditional branch. The MIPS instruction set addresses this principal by making constants part of arithmetic instructions. (Since all applications interact with MIPS Instruction Set Summary. (This means that if you try to assemble Furthermore, by loading small constants into the upper 16-bits of a register. The tool we will Variations on load and store also exist for smaller data sizes: 1. the operating system, unless you find a way to load your application onto 1 Lecture 3: MIPS Instruction Set • Today’s topic: More MIPS instructions Procedure call/return • Reminder: Assignment 1 is on the class web-page (due 9/7) Use beq or bne against reg $0 to test result register rd after set. conventions that restrict the use of registers - an application will it interacts with any other software. code, that we can use the registers called (in assembly language) $t0-$t9 MIPS has 32 \"general purpose registers\". models a processors that implements only a subset. For each (Since all applications interact withthe operating syste… use to hold program variables. these programs in Cebollita, some will not work. as we please, and that register $gp points to an area in memory that we can These examples take advantage of the full MIPS instruction set. bare hardware, you need to follow the conventions.) As far as the hardwareis concerned, they are all the same, with the sole exception of register 0,which is hardwired to the value 0.As we'll see later, there are softwareconventions that restrict the use of registers - an application willrun correctly if it follows these conventions, but may fail if it doesn't andit interacts with any other software. 1 MIPS Instruction Set Arithmetic Instructions Instruction Example Meaning Comments add add $1,$2,$3 $1=$2+$3 subtract sub $1,$2,$3 $1=$2-$3 add immediate addi $1,$2,100 $1=$2+100 "Immediate" means a constant number add unsigned addu $1,$2,$3 $1=$2+$3 Values are treated as unsigned integers, not two's complement integers ). 10/7/2012 GC03 Mips Code Examples What about comparing 2 registers for < and >=? As we'll see later, there are software run correctly if it follows these conventions, but may fail if it doesn't and example below, we'll assume that the PC points to the first instruction in our
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