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| author | Richard Sandiford <richard.sandiford@arm.com> | 2019-11-16 10:43:52 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2019-11-16 10:43:52 +0000 |
| commit | eb23241ba81aace0c881ccee4643632809741953 (patch) | |
| tree | 7eec28a84e7f30c72a362aff3439e15219dcea7e /gcc/config | |
| parent | bcc7e346bf9b5dc77797ea949d6adc740deb30ca (diff) | |
| download | gcc-eb23241ba81aace0c881ccee4643632809741953.zip gcc-eb23241ba81aace0c881ccee4643632809741953.tar.gz gcc-eb23241ba81aace0c881ccee4643632809741953.tar.bz2 | |
[AArch64] Enable VECT_COMPARE_COSTS by default for SVE
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
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/aarch64/aarch64.c | 10 | ||||
| -rw-r--r-- | gcc/config/aarch64/aarch64.opt | 4 |
2 files changed, 13 insertions, 1 deletions
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index e2251a2..9ffe213 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -15962,7 +15962,15 @@ aarch64_autovectorize_vector_modes (vector_modes *modes, bool) for this case. */ modes->safe_push (V2SImode); - return 0; + unsigned int flags = 0; + /* Consider enabling VECT_COMPARE_COSTS for SVE, both so that we + can compare SVE against Advanced SIMD and so that we can compare + multiple SVE vectorization approaches against each other. There's + not really any point doing this for Advanced SIMD only, since the + first mode that works should always be the best. */ + if (TARGET_SVE && aarch64_sve_compare_costs) + flags |= VECT_COMPARE_COSTS; + return flags; } /* Implement TARGET_MANGLE_TYPE. */ diff --git a/gcc/config/aarch64/aarch64.opt b/gcc/config/aarch64/aarch64.opt index fc43428..3b675e1 100644 --- a/gcc/config/aarch64/aarch64.opt +++ b/gcc/config/aarch64/aarch64.opt @@ -258,3 +258,7 @@ long aarch64_stack_protector_guard_offset = 0 moutline-atomics Target Report Mask(OUTLINE_ATOMICS) Save Generate local calls to out-of-line atomic operations. + +-param=aarch64-sve-compare-costs= +Target Joined UInteger Var(aarch64_sve_compare_costs) Init(1) IntegerRange(0, 1) Param +When vectorizing for SVE, consider using unpacked vectors for smaller elements and use the cost model to pick the cheapest approach. Also use the cost model to choose between SVE and Advanced SIMD vectorization. |