lab/interactiune-c-assembly: Add inline exercises #193
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Adding 1-inline-for, 2-inline-rotate and 3-inline-rtdscp and reordering the exercises accordingly. Signed-off-by: Andreia Ocanoaia <[email protected]>
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| include ../../utils/Makefile.generic | ||
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| include ../../utils/Makefile.generic | |
| include ../../utils/Makefile.generic |
You have 2 trailing newlines at the end of each Makefile. Remove one of them.
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| /inline_for.asm | |||
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| /inline_for.asm | |
| /inline_for |
Why .asm?
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| /inline_rotate.asm | |||
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| /inline_rotate.asm | |
| /inline_rotate |
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| /inline_cpuid.asm | |||
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| /inline_cpuid.asm | |
| /inline_rdtscp |
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| PROGNAME := inline_rtdscp | |||
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| PROGNAME := inline_rtdscp | |
| PROGNAME := inline_rdtscp |
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| /inline_rotate.asm | |||
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| /inline_rotate.asm | |
| /inline_rotate |
| > **NOTE:** Nu are sens să declarăm ca fiind inline funcțiile recursive. De ce? | ||
| Acum este ușor să ghicim la ce se referă expresia “inline assembly”: un set de instrucțiuni assembly scrise ca funcții inline. Inline assembly este folosit ca o metoda de optimizare și este foarte des întâlnit în system programming. | ||
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| În programele C/C++ se pot insera instrucțiuni în limbaje de asamblare folosing cuvântul cheie “asm”. |
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| În programele C/C++ se pot insera instrucțiuni în limbaje de asamblare folosing cuvântul cheie “asm”. | |
| În programele C/C++ se pot insera instrucțiuni în limbaje de asamblare folosing cuvântul cheie "asm". |
Use ASCII quotes.
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rdtscp places the timestamp counter in edx:eax as a 64-bit number, not a string. In addition, it places the CPU number in ecx, but since students aren't used to multicore operations yet, I think we should ignore this register and focus on edx:eax. Change this exercise so that it uses rdtscp to calculate the time spent on some operations, like a for loop doing whatever.
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There are two variants to the operation - rdtsc and rdtscp, where rdtscp also adds the processor type, but more importantly also acts as a barrier, so measuring time should be more correct using it. However, measuring time using the TSC is non-trivial, since you also need to account for the increment frequency.
You will need to explain what the numbers actually mean, since they don't translate directly to either seconds (you need to extract the increment frequency from somewhere - e.g., the system's journal using something like journalctl -xe -n 10000 | grep clocksource), nor processor clock cycles (most modern CPUs have invariant TSC, which means that the TSC is incremented at a frequency near the CPU's maximum frequency without turbo boosts, regardless of C/P/T states, which especially on laptops will rarely be the same as the actual CPU frequency).
This PR adds the following exercises for
interactiunea-c-assemblylab: