[Bug tree-optimization/79213] New: FAIL: gcc.target/aarch64/ldp_vec_64_1.c scan-assembler ldp\td[0-9]+, d[0-9]

[amker at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79213

            Bug ID: 79213
           Summary: FAIL: gcc.target/aarch64/ldp_vec_64_1.c scan-assembler
                    ldp\td[0-9]+, d[0-9]
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: amker at gcc dot gnu.org
  Target Milestone: ---

This AArch64 test fails because IVOPT starts not choosing [base+offset]
addressing mode.  Given auto-increment macros are disabled for IVOPT on AArch64
at the moment, it makes more sense to xfail the test now.

File this bug tracking the lack of auto-increment addressing mode support in
IVOPT, which may be visited in the next stage1.  The reason why we disable it
now is it's too aggressive for AArch64.  We may only want to fine tune it for
small loops.