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[AArch64] PR79262: Adjust vector cost

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PR79262 has been fixed for almost all AArch64 cpus, however the example is still
vectorized in a few cases, resulting in lower performance.  Adjust the vector
cost slightly so that so that -mcpu=cortex-a53 now has identical performance as
-mcpu=cortex-a57 on libquantum.

    gcc/
	PR target/79262
	* config/aarch64/aarch64.c (generic_vector_cost): Adjust
	vec_to_scalar_cost.

From-SVN: r278452
This commit is contained in:
Wilco Dijkstra 2019-11-19 15:57:54 +00:00 committed by Wilco Dijkstra
parent c286fb4ed5
commit 4bf29d15f2
2 changed files with 7 additions and 1 deletions
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6
gcc/ChangeLog
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@ -4,6 +4,12 @@
(toplev::main): ... here as we need init_options_struct
being called.
2019-11-19 Wilco Dijkstra <wdijkstr@arm.com>
PR target/79262
* config/aarch64/aarch64.c (generic_vector_cost): Adjust
vec_to_scalar_cost.
2019-11-19 Wilco Dijkstra <wdijkstr@arm.com>
* config/arm/arm-cpus.in (armv7): Set tune to Cortex-A53.

2
gcc/config/aarch64/aarch64.c
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@ -447,7 +447,7 @@ static const struct cpu_vector_cost generic_vector_cost =
1, /* vec_int_stmt_cost */
1, /* vec_fp_stmt_cost */
2, /* vec_permute_cost */
1, /* vec_to_scalar_cost */
2, /* vec_to_scalar_cost */
1, /* scalar_to_vec_cost */
1, /* vec_align_load_cost */
1, /* vec_unalign_load_cost */