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Like `packed` type attribute, the ARC's `uncached` type attribute needs to be propagated to each member of the struct where it is used, triggering the .di flag for any access of the struct members. However, any complex CFG manipulation may drop memory pointer type attributes, leading to the impossibility to discriminate the direct accesses from normal ones. To solve this issue, we will treat the direct memory accessed specially via unspecs. gcc/ xxxx-xx-xx Claudiu Zissulescu <claziss@synopsys.com> Petro Karashchenko <petro.karashchenko@ring.com> * config/arc/arc.c (arc_is_uncached_mem_p): Check struct attributes if needed. (prepare_move_operands): Generate special unspec instruction for direct access. (arc_isuncached_mem_p): Propagate uncached attribute to each structure member. * config/arc/arc.md (VUNSPEC_ARC_LDDI): Define. (VUNSPEC_ARC_STDI): Likewise. (ALLI): New mode iterator. (mALLI): New mode attribute. (lddi): New instruction pattern. (stdi): Likewise. (stdidi_split): Split instruction for architectures which are not supporting ll64 option. (lddidi_split): Likewise. testsuite/ xxxx-xx-xx Claudiu Zissulescu <claziss@synopsys.com> Petro Karashchenko <petro.karashchenko@ring.com> * gcc.target/arc/uncached-1.c: Update test. * gcc.target/arc/uncached-2.c: Likewise. * gcc.target/arc/uncached-3.c: New test. * gcc.target/arc/uncached-4.c: Likewise. * gcc.target/arc/uncached-5.c: Likewise. * gcc.target/arc/uncached-6.c: Likewise. * gcc.target/arc/uncached-7.c: Likewise. * gcc.target/arc/uncached-8.c: Likewise. * gcc.target/arc/arc.exp (ll64): New predicate.
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