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[PATCH ARM] Fix PR50099

From: Ramana Radhakrishnan <ramana dot radhakrishnan at linaro dot org>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>
Cc: Patch Tracking <patches at linaro dot org>
Date: Tue, 6 Sep 2011 15:15:44 +0100
Subject: [PATCH ARM] Fix PR50099

Hi,

PR target/50099 is a case where we are using the wrong predicate for
the sign_extend from QI to DImode values. ldrsb has a lower range than
the other ldrb instructions in ARM state and hence one has to be
careful about generating the right addresses when splitting it.

Attached is a patch to fix this. I will commit this if there are no
regressions. A backport to 4.6 branch will be done after suitable
regression testing.

cheers
Ramana


2011-09-06  Ramana Radhakrishnan  <ramana.radhakrishnan@linaro.org>

	PR target/50099
	* config/arm/iterators.md (qhs_zextenddi_cstr): New.
	(qhs_zextenddi_op): New.
	* config/arm/arm.md ("zero_extend<mode>di2"): Use them.
        * config/arm/predicates.md ("arm_extendqisi_mem_op"):
Distinguish between ARM and Thumb2 states.

        PR target/50099
        * gcc.target/arm/pr50099.c: New test.

Attachment: pr50099-patch.txt
Description: Text document

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