[PATCH] Avoid -fcompare-debug differences in scheduler with -fsched-pressure (PR debug/44028)

[Jeff Law]

On 05/10/10 11:19, Jakub Jelinek wrote:
> Hi!
>
> When schedule_insn decides it needs to drop a debug location of
> a variable, it wasn't clearing its INSN_REG_USE_LIST, which means if
> those links said a register is used after its last use (even when it is
> not, because (clobber (const_int 0)) doesn't reference anything),
> calling schedule_insn on a debug insn could lead into register pressure
> differences.
>
> Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux.
> Ok for trunk?
>
> 2010-05-10  Jakub Jelinek<jakub@redhat.com>
>
> 	PR debug/44028
> 	* haifa-sched.c (schedule_insn): When clearing INSN_VAR_LOCATION_LOC,
> 	clear also INSN_REG_USE_LIST.
>
> 	* gcc.dg/pr44028.c: New test.
>    
OK
Jeff