[Bug inline-asm/101438] Compiler hang on inline asm with local register and VLA operands

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101438

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |accepts-invalid,
                   |                            |compile-time-hog, ra
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-07-14
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
At -O0 we get

t3.c: In function 'main':
t3.c:21:5: error: 'asm' operand has impossible constraints
   21 |     __asm__ (""
      |     ^~~~~~~

likely because there's not enough registers to pass in 'arr' (and we need a FP
to allocate arr).  At -O1 it looks like we think we can manage but do not make
progress reloading.

So confirmed, a diagnostic would be nice.