1e271beeec
An earlier patch introduced arm_borrow_operation, this one introduces the carry variant, which is the same except that the logic of the carry-setting is inverted. Having done this we can now match more cases where the carry flag is propagated from comparisons with different modes without having to define even more patterns. A few small changes to the expand patterns are required to directly create the carry representation. The iterators LTUGEU is no-longer needed and removed, as is the code attribute 'cnb'. Finally, we fix a long-standing bug which was probably inert before: in Thumb2 a shift with ADC can only be by an immediate amount; register-specified shifts are not permitted. * config/arm/predicates.md (arm_carry_operation): New special predicate. * config/arm/iterators.md (LTUGEU): Delete iterator. (cnb): Delete code attribute. (optab): Delete ltu and geu elements. * config/arm/arm.md (addsi3_carryin): Renamed from addsi3_carryin_<optab>. Remove iterator and use arm_carry_operand. (add0si3_carryin): Similarly, but from add0si3_carryin_<optab>. (addsi3_carryin_alt2): Similarly, but from addsi3_carryin_alt2_<optab>. (addsi3_carryin_clobercc): Similarly. (addsi3_carryin_shift): Similarly. Do not allow register shifts in Thumb2 state. From-SVN: r277171 |
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