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A previous change to simplify LRA introduced in 11b809 (From-SVN: r279550) disabled hard register splitting for -O0. This causes a problem on aarch64 in cases where parameters are passed in multiple registers (in the bug report an OI passed in 2 V4SI registers). This is mandated by the AAPCS. gcc/ChangeLog: 2020-01-29 Joel Hutton <Joel.Hutton@arm.com> PR target/93221 * ira.c (ira): Revert use of simplified LRA algorithm. gcc/testsuite/ChangeLog: 2020-01-29 Joel Hutton <Joel.Hutton@arm.com> PR target/93221 * gcc.target/aarch64/pr93221.c: New test.
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