MIPS floating point instructions

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Presentation transcript:

MIPS floating point instructions

Load and Store Load or store from a memory location (pseudoinstruction ). Just load the 32 bits into the register. l.s $f0, val s.s $f0, val Load immediate number (pseudoinstruction ) li.s $f0, 0.5

Print and load Print: Read li $v0, 2 li $f12, 0.5 syscall li $v0, 6 (the read will be in $f0)

Arithmetic Instructions abs.s $f0, $f1 add.s $f0, $f1, $f2 sub.s $f0, $f1, $f2 mul.s $f0, $f1, $f2 div.s $f0, $f1, $f2 neg.s $f0, $f1

Data move mov.s $f0, $f1 mfc1 $t0, $f0 mtc1 $t0, $f0

Convert to integer and from integer cvt.s.w $f0, $f0 # convert the 32 bit in $f0 currently representing an integer to float of the same value cvt.w.s $f0, $f0 # the reverse

Comparison instructions c.lt.s $f0,$f1 #set a flag in coprocessor 1if $f0 < $f1, else clear it. The flag will stay until set or cleared next time c.le.s $f0,$f1 #set flag if $f0 <= $f1, else clear it bc1t L1 # branch to L1 if the flag is set bc1f L1 # branch to L1 if the flag is 0 Where does the bc1t instruction take place? The main processor or the coprocessor?

Computing the square root of a number n The Newton’s method x’=(x+n/x)/2 The code we used in the class is: http://www.cs.fsu.edu/~zzhang/CDA3100_Spring_2009_files/float2.asm