From: "Dr. David Alan Gilbert" <david.gilbert@linaro.org>
To: gcc-patches@gcc.gnu.org
Cc: ramana.radhakrishnan@linaro.org, rth@redhat.com,
joseph@codesourcery.com, patches@linaro.org
Subject: [Patch 3/4] ARM 64 bit sync atomic operations [V2]
Date: Tue, 26 Jul 2011 09:23:00 -0000 [thread overview]
Message-ID: <20110726090156.GD6925@davesworkthinkpad> (raw)
In-Reply-To: <20110726090115.GC6925@davesworkthinkpad>
Micahel K. Edwards points out in PR/48126 that the sync is in the wrong place
relative to the branch target of the compare, since the load could float
up beyond the ldrex.
gcc/
* config/arm/arm.c (arm_output_sync_loop): Move label before barier,
fixes PR/48126
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 28be078..cee3471 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -23780,8 +23780,11 @@ arm_output_sync_loop (emit_f emit,
}
}
- arm_process_output_memory_barrier (emit, NULL);
+ /* Note: label is before barrier so that in cmp failure case we still get
+ a barrier to stop subsequent loads floating upwards past the ldrex
+ pr/48126 */
arm_output_asm_insn (emit, 1, operands, "%sLSYB%%=:", LOCAL_LABEL_PREFIX);
+ arm_process_output_memory_barrier (emit, NULL);
}
static rtx
next prev parent reply other threads:[~2011-07-26 9:02 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-01 15:53 [Patch 0/3] ARM 64 bit atomic operations Dr. David Alan Gilbert
2011-07-01 15:55 ` [Patch 1/3] " Dr. David Alan Gilbert
2011-07-12 21:24 ` Ramana Radhakrishnan
2011-07-13 9:18 ` David Gilbert
2011-07-01 15:56 ` [Patch 2/3] " Dr. David Alan Gilbert
2011-07-01 16:03 ` Richard Henderson
2011-07-01 17:08 ` David Gilbert
2011-07-01 19:38 ` Joseph S. Myers
2011-07-04 22:27 ` David Gilbert
2011-07-01 15:57 ` [Patch 3/3] " Dr. David Alan Gilbert
2011-07-12 15:31 ` Ramana Radhakrishnan
2011-07-12 12:55 ` [Patch 0/3] " Ramana Radhakrishnan
2011-07-26 9:14 ` [Patch 0/4] ARM 64 bit sync atomic operations [V2] Dr. David Alan Gilbert
2011-07-26 9:16 ` [Patch 1/4] " Dr. David Alan Gilbert
2011-07-26 9:18 ` [Patch 2/4] " Dr. David Alan Gilbert
2011-07-26 9:23 ` Dr. David Alan Gilbert [this message]
2011-07-26 9:24 ` [Patch 4/4] " Dr. David Alan Gilbert
2011-08-01 15:43 ` Ramana Radhakrishnan
2011-08-17 13:07 ` [Patch 3/4] " Ramana Radhakrishnan
2011-09-30 18:04 ` [Patch 2/4] " Ramana Radhakrishnan
2011-09-30 18:29 ` H.J. Lu
2011-10-03 13:22 ` David Gilbert
2011-09-30 20:51 ` Joseph S. Myers
2011-10-03 8:35 ` Andrew Haley
2011-10-03 14:04 ` David Gilbert
2011-10-03 15:56 ` Joseph S. Myers
2011-10-03 16:07 ` Jakub Jelinek
2011-09-30 14:25 ` [Patch 1/4] " Ramana Radhakrishnan
2011-10-03 12:53 ` David Gilbert
2011-10-03 15:18 ` David Gilbert
2011-10-06 17:52 ` [Patch 0/5] ARM 64 bit sync atomic operations [V3] Dr. David Alan Gilbert
2011-10-06 17:53 ` [Patch 1/5] " Dr. David Alan Gilbert
2011-10-06 17:54 ` [Patch 2/5] " Dr. David Alan Gilbert
2011-10-06 17:55 ` [Patch 3/5] " Dr. David Alan Gilbert
2011-10-06 18:03 ` [Patch 4/5] " Dr. David Alan Gilbert
2011-10-06 18:03 ` [Patch 5/5] " Dr. David Alan Gilbert
2011-10-12 4:51 ` Ramana Radhakrishnan
2011-10-12 5:06 ` Mike Stump
2011-10-12 0:53 ` [Patch 4/5] " Ramana Radhakrishnan
2011-10-12 2:35 ` [Patch 3/5] " Ramana Radhakrishnan
2011-10-12 0:52 ` [Patch 2/5] " Ramana Radhakrishnan
2011-10-12 1:45 ` Ramana Radhakrishnan
2011-10-12 0:51 ` [Patch 1/5] " Ramana Radhakrishnan
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