Convert figure images to markdown
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21-01.md
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21-01.md
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@ -95,8 +95,7 @@ Unfortunately, this tends to extend the lifetimes of pointer registers
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to span a greater number of instructions, making the Pentium's
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relatively small register set seem even smaller.
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**Figure 21.1** *An AGI can stall up to three instructions later.*
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As an example of a sort of AGI that's new to the Pentium, consider the
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following test for a NULL pointer, followed by the use of the pointer if
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@ -120,5 +119,4 @@ use **TEST EBX,EBX** instead of **AND; TEST** can't modify EBX, so no
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AGI occurs. Sure, **AND EBX,EBX** doesn't modify EBX either, but the
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Pentium doesn't know that, so it has to insert the AGI.
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\
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**Figure 21.2** *An AGI can cost as many as 3 cycles.*
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