Given assembly code:

x in %xmm0

find_range:

vxorps %xmm1, %xmm1, %xmm1

vucomiss %xmm1, %xmm0

ja .L5

vucomiss %xmm1, %xmm0

jp .L8

movl $1, %eax

je .L3

.L8:

vucomiss %xmm1, %xmm0

setbe %al

movzbl %al, %eax

addl $2, %eax

ret

.L5:

movl $0, %eax

.L3:

Rep;ret

Explanation:

The assembly function “find_range” illustrates conditional branching in floating point.

It compares a value “x” with 0.

If value is less than 0, then result is negative.

If value is greater than 0, then result is positive.

If value equals 0, then result is zero.

The instruction “vxorps %xmm1, %xmm1, %xmm1” sets value of “%xmm1” to 0.

The instruction “vucomiss %xmm1, %xmm0” compares values.

The instruction “jp .L8” jumps to label “.L8”.

The instruction “ja .L5” jumps to label “.L5” if first value is greater than second.

The instruction “movl $0, %eax” moves immediate value to register “%eax”.

The instruction “movl $1, %eax” moves immediate value to register “%eax”...

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Chapter 3, Problem 3.73HW

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Chapter 3 Solutions

Computer Systems: A Programmer's Perspective Plus Mastering Engineering With Pearson Etext -- Access Card Package (3rd Edition)

Ch. 3.4 - Prob. 3.1PP Ch. 3.4 - Prob. 3.2PP Ch. 3.4 - Prob. 3.3PP Ch. 3.4 - Prob. 3.4PP Ch. 3.4 - Prob. 3.5PP Ch. 3.5 - Prob. 3.6PP Ch. 3.5 - Prob. 3.7PP Ch. 3.5 - Prob. 3.8PP Ch. 3.5 - Prob. 3.9PP Ch. 3.5 - Prob. 3.10PP

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