Zbigniew Jędrzejewski-Szmek
c9ea39689f
In sd_event_source.child, we have 5 bools. If we make them each take one byte,
the structure size increases. So let's do that for the three of them, and leave
the other two (less frequently used) squished into the last byte. This allows
more efficient code to be generated, without changing the size of the struct:
$ diff -u <(objdump -S build/src/shared/libsystemd-shared-258.so.0|awk '/^static void source_io_unregister/,/^\}/') \
<(objdump -S build/src/shared/libsystemd-shared-258.so|awk '/^static void source_io_unregister/,/^\}/')
s->io.registered = false;
- 34d46f: 48 8b 45 d8 mov -0x28(%rbp),%rax
- 34d473: 0f b6 90 a4 00 00 00 movzbl 0xa4(%rax),%edx
- 34d47a: 83 e2 fe and $0xfffffffe,%edx
- 34d47d: 88 90 a4 00 00 00 mov %dl,0xa4(%rax)
- 34d483: eb 04 jmp 34d489 <source_io_unregister+0x1ca>
+ 34bffe: 48 8b 45 d8 mov -0x28(%rbp),%rax
+ 34c002: c6 80 a4 00 00 00 00 movb $0x0,0xa4(%rax)
+ 34c009: eb 04 jmp 34c00f <source_io_unregister+0x1be>
return;
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