[Bug inline-asm/30527] Use of input/output operands in __asm__ templates not fully documented

[davmac at davmac dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=30527

--- Comment #4 from Davin McCall <davmac at davmac dot org> ---
I recently stumbled across section 6.43.2.7 of the manual, which does in fact
document the operand modifiers for (and only for) x86. Modifiers for other
architectures are not documented.