Comment 8 for bug 838994

It's caused by r163935:

Author: bernds
Date: Mon Sep 6 22:32:26 2010
New Revision: 163935

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=163935
Log:
 PR target/43137
 * config/arm/iterators.md (qhs_zextenddi_cond, qhs_sextenddi_cond):
 New define_mode_attrs.
 * config/arm/arm.md (zero_extendsidi2, arm_zero_extendsidi2,
 arm_exxtendsidi2, arm_extendsidi2): Delete patterns.
 (zero_extend<mode>di2, extend<mode>di2 and related splits): New.
 (thumb1_zero_extendhisi2): Remove code to handle LABEL_REFs.
 Remove pool_range attribute.
 (arm_zero_extendhisi2, arm_zero_extendhisi2_v6, arm_zero_extendqisi2,
 arm_zero_extendqisi2_v6, thumb1_zero_extendqisi2_v6): Remove
 pool_range and neg_pool_range attributes.
 * config/arm/thumb2.md (thumb2_zero_extendsidi2,
 thumb2_zero_extendhidi2, thumb2_zero_extendqidi2, thumb2_extendsidi2,
 thumb2_extendhidi2, thumb2_extendqidi2): Delete.