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This patch adds support for "truncating" to a partial SVE vector from either a full SVE vector or a wider partial vector. This truncation is actually a no-op and so should have zero cost in the vector cost model. 2019-11-16 Richard Sandiford <richard.sandiford@arm.com> gcc/ * config/aarch64/aarch64-sve.md (trunc<SVE_HSDI:mode><SVE_PARTIAL_I:mode>2): New pattern. * config/aarch64/aarch64.c (aarch64_integer_truncation_p): New function. (aarch64_sve_adjust_stmt_cost): Call it. gcc/testsuite/ * gcc.target/aarch64/sve/mask_struct_load_1.c: Add --param aarch64-sve-compare-costs=0. * gcc.target/aarch64/sve/mask_struct_load_2.c: Likewise. * gcc.target/aarch64/sve/mask_struct_load_3.c: Likewise. * gcc.target/aarch64/sve/mask_struct_load_4.c: Likewise. * gcc.target/aarch64/sve/mask_struct_load_5.c: Likewise. * gcc.target/aarch64/sve/pack_1.c: Likewise. * gcc.target/aarch64/sve/truncate_1.c: New test. From-SVN: r278344
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