RISC-V: Enable VECT_COMPARE_COSTS by default
Checks
Commit Message
since we have added COST framework, we by default enable VECT_COMPARE_COSTS.
Also, add 16/32/64 to provide more choices for COST comparison.
This patch doesn't change any behavior from the current testsuite since we are using
default COST model.
gcc/ChangeLog:
* config/riscv/riscv-v.cc (autovectorize_vector_modes): Enable VECT_COMPARE_COSTS by default.
---
gcc/config/riscv/riscv-v.cc | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
Comments
Hi Juzhe,
thanks, this is OK, we would have needed this sooner or later anyway.
Regards
Robin
Committed, thank Robin.
Pan
-----Original Message-----
From: Gcc-patches <gcc-patches-bounces+pan2.li=intel.com@gcc.gnu.org> On Behalf Of Robin Dapp via Gcc-patches
Sent: Friday, September 1, 2023 5:58 PM
To: Juzhe-Zhong <juzhe.zhong@rivai.ai>; gcc-patches@gcc.gnu.org
Cc: kito.cheng@sifive.com; kito.cheng@gmail.com
Subject: Re: [PATCH] RISC-V: Enable VECT_COMPARE_COSTS by default
Hi Juzhe,
thanks, this is OK, we would have needed this sooner or later anyway.
Regards
Robin
@@ -2173,7 +2173,7 @@ autovectorize_vector_modes (vector_modes *modes, bool)
full vectors for wider elements.
- full_size / 8:
Try using 64-bit containers for all element types. */
- static const int rvv_factors[] = {1, 2, 4, 8};
+ static const int rvv_factors[] = {1, 2, 4, 8, 16, 32, 64};
for (unsigned int i = 0; i < sizeof (rvv_factors) / sizeof (int); i++)
{
poly_uint64 units;
@@ -2183,12 +2183,8 @@ autovectorize_vector_modes (vector_modes *modes, bool)
modes->safe_push (mode);
}
}
- unsigned int flag = 0;
if (TARGET_VECTOR_VLS)
{
- /* Enable VECT_COMPARE_COSTS between VLA modes VLS modes for scalable
- auto-vectorization. */
- flag |= VECT_COMPARE_COSTS;
/* Push all VLSmodes according to TARGET_MIN_VLEN. */
unsigned int i = 0;
unsigned int base_size = TARGET_MIN_VLEN * riscv_autovec_lmul / 8;
@@ -2201,7 +2197,8 @@ autovectorize_vector_modes (vector_modes *modes, bool)
size = base_size / (1U << i);
}
}
- return flag;
+ /* Enable LOOP_VINFO comparison in COST model. */
+ return VECT_COMPARE_COSTS;
}
/* If the given VECTOR_MODE is an RVV mode, first get the largest number