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[Patch, ARM] Fix PR53859: ICE on armv7e-m

From: "Greta Yorsh" <Greta dot Yorsh at arm dot com>
To: "GCC Patches" <gcc-patches at gcc dot gnu dot org>
Cc: "Richard Earnshaw" <Richard dot Earnshaw at arm dot com>, "Ramana Radhakrishnan" <Ramana dot Radhakrishnan at arm dot com>, "Zhuolin Liu" <Zhuolin dot Liu at arm dot com>, "Joey Ye" <Joey dot Ye at arm dot com>
Date: Tue, 10 Jul 2012 13:20:35 +0100
Subject: [Patch, ARM] Fix PR53859: ICE on armv7e-m

New RTL patterns generated for epilogues with RETURN (trunk r188742) are not
recognized by the pattern matching code in arm_early_load_addr_dep, which is
used for insn latency calculation when tuning for cortex-m4. It causes an
ICE when tuning for armv7e-m or cortex-m4:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53859.

The obvious fix is to detect RETURN pattern in arm_early_load_addr_dep. 

No regression on qemu.

Ok for trunk?

Thanks,
Greta

ChangeLog

2012-07-10  Greta Yorsh  <Greta.Yorsh@arm.com>

gcc/
	PR target/53859
	* config/arm/arm.c (arm_early_load_addr_dep): Handle new
	epilogue patterns.

gcc/testsuite

	PR target/53859
	* gcc.target/arm/pr53859.c: New test.

Attachment: m4-epilogue-sched.patch.txt
Description: Text document

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