[Bug inline-asm/69899] gcc ICE on invalid code on x86_64-linux-gnu in "replace_reg"

[gccbugzilla at limegreensocks dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69899

David <gccbugzilla at limegreensocks dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |gccbugzilla@limegreensocks.
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--- Comment #2 from David <gccbugzilla at limegreensocks dot com> ---
To confirm the ice and to provide more details:

double a;
fn1(){ asm("" : "=t"(a) : "0u"(0));   } // replace_reg at reg-stack.c:687
fn2(){ asm("" : "=t"(a) : "0u"(0.0)); } // No ICE
fn3(){ asm("" : "=t"(a) :  "u"(0.0)); } // change_stack at reg-stack.c:2522

fn1 is the OP's code.  Changing the input to a float (0.0 vs 0) resolves the
first ICE, but removing the "0" from the input constraint throws another.