dw <limegreenso...@yahoo.com> writes: > > What would you say to something like this: > > "Since GCC does not parse the asm, it has no visibility of any static > variables or functions it references. This may result in those > symbols getting discarded by GCC as unused. To avoid this problem, > list the symbols as inputs or outputs."
output makes no sense I think, only input. You still need the part about the top-level asm, where input doesn't work. > >> And another common problem: >> >> For top level asm there is no guarantee the compiler outputs the >> statements in order. > > Well, basic asm (which is the only thing you can use at top level) > already says: > > "Do not expect a sequence of |asm| statements to remain perfectly > consecutive after compilation. To ensure that assembler instructions > maintain their order, use a single |asm| statement containing multiple > instructions. Note that GCC's optimizer can move |asm| statements > relative to other code, including across jumps. " > > Is something more needed? Yes it should be made clear that this applies to top-level asm too. -Andi -- a...@linux.intel.com -- Speaking for myself only
