[Bug inline-asm/85546] GCC assumes volatile asm block returns same value in loop
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85546 Alexander Monakov changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED CC||amonakov at gcc dot gnu.org Resolution|--- |INVALID --- Comment #3 from Alexander Monakov --- I'm not sure Richard is correct about the definition of volatile asms: similar to reads of volatile objects, volatile asms can produce different output on each invocation (iow they are not pure/const). In any case the inline asm in io() is missing clobbers for rcx, r11 and memory, which makes the bug invalid.
[Bug inline-asm/85546] GCC assumes volatile asm block returns same value in loop
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85546 --- Comment #2 from Richard Biener --- I think this is a misconception of what a volatile asm is. Volatile says there may be additional side-effects the asm performs - it does _not_ mean the output depends on more than the inputs. Note I can't reproduce your findings but your instructions for reproduction are somewhat incomplete.
[Bug inline-asm/85546] GCC assumes volatile asm block returns same value in loop
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85546 --- Comment #1 from be11f157cd19c4a2ba1e9c70a38b1a74 at protonmail dot com --- The code sample is compiled with gcc -ffreestanding -nostdlib -nostartfiles main.c
