rnk added a comment.
Won't the mid-level optimizer turn these register variables into undefs, and
we'll end up with this kind of IR?
void f() {
int register var asm ("eax") ;
asm volatile ("add %%eax, %0\n\tret" : : "r"(var));
}
->
define void @"\01?f@@YAXXZ"() local_unnamed_addr #0 {
entry:
tail call void asm sideeffect "add %eax, $0\0A\09ret",
"{eax},~{dirflag},~{fpsr},~{flags}"(i32 undef) #1, !srcloc !2
ret void
}
I guess it's OK so long as we don't codegen undef to anything, but it could go
badly.
https://reviews.llvm.org/D24193
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