98fa0f89b1
## read+write modifier '+' This small sugar was left out in the original implementation (#5359). When an output operand with the '+' modifier is encountered, we store the index of that operand alongside the expression to create and append an input operand later. The following lines are equivalent: ``` asm!("" : "+m"(expr)); asm!("" : "=m"(expr) : "0"(expr)); ``` ## misplaced options and clobbers give a warning It's really annoying when a small typo might change behavior without any warning. ``` asm!("mov $1, $0" : "=r"(x) : "r"(8u) : "cc" , "volatile"); //~^ WARNING expected a clobber, but found an option ``` ## liveness Fixed incorrect order of propagation. Sometimes it caused spurious warnings in code: `warning: value assigned to `i` is never read, #[warn(dead_assignment)] on by default` ~~Note: Rebased on top of another PR. (uses other changes)~~ * [x] Implement read+write * [x] Warn about misplaced options * [x] Fix liveness (`dead_assignment` lint) * [x] Add all tests |
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