What is assembler for?

Question

assembler

Why does assembler exist now? Previously, when drivers and loaders for systems were written on it, as well as low-level tasks, what is written on it now? Uefi can run .efi pe files written in C, drivers are also written in C, and since C, if I'm not mistaken, is compiled first into asm, and then into binary, it turns out that the assembler becomes stupidly unnecessary

Answer 1

If you need to get some specific code at the output, without fear that the compiler or optimizer of a high-level PL will "rephrase" it with its instructions. In 99.99% of cases this is not necessary.

Answer 2

Assembler is actively used for:
* SIMD optimizations in the most complex tasks: video encoding and decoding, emulation of other architectures (for example, game consoles on a computer)
* Writing (parts of) low-level code for processors: bootroms, firmware, etc.
* Creating the same UEFI for a specific architecture / chipset

Answer 3

since si, if I'm not mistaken, is compiled first into asm, and then into a binary,

Yes, sometimes.

it turns out that the assembler stupidly becomes unnecessary

No. The .asm file will not compile itself into a binary.

Answer 4

All openssl algorithms are implemented in assembler. Because optimizing compilers generate non-optimal code. It's not even about SIMD, the simplest instructions with a very limited number of variables, compilers are not able to arrange in perfect order.