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[PATCH, rtl-optimization]: Fix PR56275, ICE in simplify_subreg, at simplify-rtx.c:5261 with vector code.


Hello!

Attached patch prevents out-of-bounds offset in the call to
simplify_subreg, where the subreg offset is taken from the offset of a
memory access. The problem triggers on 4.6 branch and is latent on 4.7
and mainline.

2013-02-10  Uros Bizjak  <ubizjak@gmail.com>

	PR rtl-optimization/56275
	* simplify-rtx.c (avoid_constant_pool_reference): Check that
	offset is non-negative and less than cmode size before
	calling simplify_subreg.

testsuite/ChangeLog:

2013-02-10  Uros Bizjak  <ubizjak@gmail.com>

	PR rtl-optimization/56275
	* gcc.dg/pr56275.c: New test.

Tested on x86_64-pc-linux-gnu {,-m32}.

OK for mainline and release branches?

Uros.

Attachment: p.diff.txt
Description: Text document


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