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| author | Juzhe-Zhong <juzhe.zhong@rivai.ai> | 2023-10-16 16:25:04 +0800 |
|---|---|---|
| committer | Lehua Ding <lehua.ding@rivai.ai> | 2023-10-16 17:18:37 +0800 |
| commit | a5fe9f063de64aa2755c9ae9e90ed1ff64ee0f47 (patch) | |
| tree | 8c2ad8c0fb59488af34a3ca836696c13037bce41 /gcc | |
| parent | b7a28c0904fa67f98d7ca7e9d828fc5fc58c7078 (diff) | |
| download | gcc-a5fe9f063de64aa2755c9ae9e90ed1ff64ee0f47.zip gcc-a5fe9f063de64aa2755c9ae9e90ed1ff64ee0f47.tar.gz gcc-a5fe9f063de64aa2755c9ae9e90ed1ff64ee0f47.tar.bz2 | |
RISC-V: Use VLS modes if the NITERS is known and smaller than VLS mode elements.
void
foo8 (int64_t *restrict a)
{
for (int i = 0; i < 16; ++i)
a[i] = a[i]-16;
}
We use VLS modes instead of VLA modes even it is specified by dynamic LMUL.
gcc/ChangeLog:
* config/riscv/riscv-vector-costs.cc (costs::preferred_new_lmul_p): Use VLS modes.
gcc/testsuite/ChangeLog:
* gcc.dg/vect/costmodel/riscv/rvv/no-dynamic-lmul-1.c: New test.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/riscv/riscv-vector-costs.cc | 13 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/vect/costmodel/riscv/rvv/no-dynamic-lmul-1.c | 64 |
2 files changed, 73 insertions, 4 deletions
diff --git a/gcc/config/riscv/riscv-vector-costs.cc b/gcc/config/riscv/riscv-vector-costs.cc index 878f72c..0b89039 100644 --- a/gcc/config/riscv/riscv-vector-costs.cc +++ b/gcc/config/riscv/riscv-vector-costs.cc @@ -446,10 +446,6 @@ costs::preferred_new_lmul_p (const vector_costs *uncast_other) const auto other_loop_vinfo = as_a<loop_vec_info> (other->m_vinfo); class loop *loop = LOOP_VINFO_LOOP (this_loop_vinfo); - if (!LOOP_VINFO_CAN_USE_PARTIAL_VECTORS_P (this_loop_vinfo) - && LOOP_VINFO_CAN_USE_PARTIAL_VECTORS_P (other_loop_vinfo)) - return false; - if (loop_autovec_infos.get (loop) && loop_autovec_infos.get (loop)->end_p) return false; else if (loop_autovec_infos.get (loop)) @@ -483,6 +479,15 @@ costs::preferred_new_lmul_p (const vector_costs *uncast_other) const machine_mode biggest_mode = compute_local_live_ranges (program_points_per_bb, live_ranges_per_bb); + /* If we can use simple VLS modes to handle NITERS element. + We don't need to use VLA modes with partial vector auto-vectorization. */ + if (LOOP_VINFO_NITERS_KNOWN_P (this_loop_vinfo) + && known_le (tree_to_poly_int64 (LOOP_VINFO_NITERS (this_loop_vinfo)) + * GET_MODE_SIZE (biggest_mode).to_constant (), + (int) RVV_M8 * BYTES_PER_RISCV_VECTOR) + && pow2p_hwi (LOOP_VINFO_INT_NITERS (this_loop_vinfo))) + return vector_costs::better_main_loop_than_p (other); + /* Update live ranges according to PHI. */ update_local_live_ranges (other->m_vinfo, program_points_per_bb, live_ranges_per_bb); diff --git a/gcc/testsuite/gcc.dg/vect/costmodel/riscv/rvv/no-dynamic-lmul-1.c b/gcc/testsuite/gcc.dg/vect/costmodel/riscv/rvv/no-dynamic-lmul-1.c new file mode 100644 index 0000000..7ede148 --- /dev/null +++ b/gcc/testsuite/gcc.dg/vect/costmodel/riscv/rvv/no-dynamic-lmul-1.c @@ -0,0 +1,64 @@ +/* { dg-do compile } */ +/* { dg-options "-march=rv64gcv_zvl4096b -mabi=lp64d -fdump-tree-vect-details" } */ + +#include <stdint-gcc.h> + +void +foo (int8_t *restrict a) +{ + for (int i = 0; i < 4096; ++i) + a[i] = a[i]-16; +} + +void +foo2 (int16_t *restrict a) +{ + for (int i = 0; i < 2048; ++i) + a[i] = a[i]-16; +} + +void +foo3 (int32_t *restrict a) +{ + for (int i = 0; i < 1024; ++i) + a[i] = a[i]-16; +} + +void +foo4 (int64_t *restrict a) +{ + for (int i = 0; i < 512; ++i) + a[i] = a[i]-16; +} + +void +foo5 (int8_t *restrict a) +{ + for (int i = 0; i < 16; ++i) + a[i] = a[i]-16; +} + +void +foo6 (int16_t *restrict a) +{ + for (int i = 0; i < 16; ++i) + a[i] = a[i]-16; +} + +void +foo7 (int32_t *restrict a) +{ + for (int i = 0; i < 16; ++i) + a[i] = a[i]-16; +} + +void +foo8 (int64_t *restrict a) +{ + for (int i = 0; i < 16; ++i) + a[i] = a[i]-16; +} + +/* { dg-final { scan-tree-dump-not "Maximum lmul" "vect" } } */ +/* { dg-final { scan-assembler-times {vsetvli} 4 } } */ +/* { dg-final { scan-assembler-times {vsetivli} 4 } } */ |