Assembly language: integer/floating-point instructions

Question 1

Describe the format of the MOV instruction.

Answer 1

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Question 2

When might the “movzbq” instruction be used?

Answer 2

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Question 3

When might the “movsbq” instruction be used?

Answer 3

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Question 4

Name all of the mov instructions used to move an integral value from one size to another with zero extension.

Answer 4

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Question 5

Name all of the mov instructions used to move an integral value from one size to another with sign extension.

Answer 5

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Question 6

What does the instruction “vcvtsi2sd” do?

Answer 6

Converts a 32-bit integer to a double.

Question 7

What pair of instructions are used to convert a double stored in register %xmm0 to a float?

Answer 7

vmovddup %xmm0, %xmm0

vcvtpd2psx %xmm0, %xmm0

Question 8

What pair of instructions are used to convert a double stored in register %xmm0 to a float?

Answer 8

vmovddup %xmm0, %xmm0

vcvtpd2psx %xmm0, %xmm0

Question 9

What does the instruction “vcvtsi2sdq” do?

Answer 9

Converts a 64-bit integer to a double.