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This patch enables VECT_COMPARE_COSTS by default for SVE, both so that we can compare SVE against Advanced SIMD and so that (with future patches) we can compare multiple SVE vectorisation approaches against each other. It also adds a target-specific --param to control this. 2019-11-16 Richard Sandiford <richard.sandiford@arm.com> gcc/ * config/aarch64/aarch64.opt (--param=aarch64-sve-compare-costs): New option. * doc/invoke.texi: Document it. * config/aarch64/aarch64.c (aarch64_autovectorize_vector_modes): By default, return VECT_COMPARE_COSTS for SVE. gcc/testsuite/ * gcc.target/aarch64/sve/reduc_3.c: Split multi-vector cases out into... * gcc.target/aarch64/sve/reduc_3_costly.c: ...this new test, passing -fno-vect-cost-model for them. * gcc.target/aarch64/sve/slp_6.c: Add -fno-vect-cost-model. * gcc.target/aarch64/sve/slp_7.c, * gcc.target/aarch64/sve/slp_7_run.c: Split multi-vector cases out into... * gcc.target/aarch64/sve/slp_7_costly.c, * gcc.target/aarch64/sve/slp_7_costly_run.c: ...these new tests, passing -fno-vect-cost-model for them. * gcc.target/aarch64/sve/while_7.c: Add -fno-vect-cost-model. * gcc.target/aarch64/sve/while_9.c: Likewise. From-SVN: r278337
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