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

From: Jeff Law <law at redhat dot com>
To: Jakub Jelinek <jakub at redhat dot com>
Cc: Vladimir Makarov <vmakarov at redhat dot com>, gcc-patches at gcc dot gnu dot org
Date: Mon, 10 May 2010 21:45:34 -0600
Subject: Re: [PATCH] Avoid -fcompare-debug differences in scheduler with -fsched-pressure (PR debug/44028)
References: <20100510171940.GD2817@tyan-ft48-01.lab.bos.redhat.com>

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

References:
- [PATCH] Avoid -fcompare-debug differences in scheduler with -fsched-pressure (PR debug/44028)
  - From: Jakub Jelinek

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