Messages in this thread | | | Subject | Re: [PATCH v7 2/2] tty: add rpmsg driver | From | Joe Perches <> | Date | Wed, 25 Mar 2020 17:01:57 -0700 |
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On Wed, 2020-03-25 at 14:31 +0100, Jiri Slaby wrote: > The question was exactly about that: can a compiler optimize it to a > bare number or will strlen call remain there?
$ cat str.c #include <string.h>
int foo(void) { return strlen("abc"); }
$ gcc -c -O2 str.c $ objdump -d str.o str.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <foo>: 0: f3 0f 1e fa endbr64 4: b8 03 00 00 00 mov $0x3,%eax 9: c3 retq
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