[AArch64] Tighten address register subreg checks
Previously we allowed subregs of non-GPR modes to be base and index registers in non-strict mode. In practice such subregs will always require a reload, so we get better code by disallowing them. 2017-08-31 Richard Sandiford <richard.sandiford@linaro.org> Alan Hayward <alan.hayward@arm.com> David Sherwood <david.sherwood@arm.com> gcc/ * config/aarch64/aarch64.c (aarch64_base_register_rtx_p): Only allow subregs whose inner modes can be stored in GPRs. (aarch64_classify_index): Likewise. Co-Authored-By: Alan Hayward <alan.hayward@arm.com> Co-Authored-By: David Sherwood <david.sherwood@arm.com> From-SVN: r251557
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