https://gcc.gnu.org/g:30cfdd6ff56972d9d1b9dbdd43a8333c85618775
commit r15-957-g30cfdd6ff56972d9d1b9dbdd43a8333c85618775
Author: Robin Dapp <rd...@ventanamicro.com>
Date: Fri May 17 12:48:52 2024 +0200
RISC-V: Remove dead perm series code and document.
With the introduction of shuffle_series_patterns the explicit handler
code for a perm series is dead. This patch removes it and also adds
a function-level comment to shuffle_series_patterns.
gcc/ChangeLog:
* config/riscv/riscv-v.cc (expand_const_vector): Document.
(shuffle_extract_and_slide1up_patterns): Remove.
Diff:
---
gcc/config/riscv/riscv-v.cc | 26 ++++----------------------
1 file changed, 4 insertions(+), 22 deletions(-)
diff --git a/gcc/config/riscv/riscv-v.cc b/gcc/config/riscv/riscv-v.cc
index 9428beca268..948aaf7d8dd 100644
--- a/gcc/config/riscv/riscv-v.cc
+++ b/gcc/config/riscv/riscv-v.cc
@@ -1485,28 +1485,6 @@ expand_const_vector (rtx target, rtx src)
emit_vlmax_insn (code_for_pred_merge (mode), MERGE_OP, ops);
}
}
- else if (npatterns == 1 && nelts_per_pattern == 3)
- {
- /* Generate the following CONST_VECTOR:
- { base0, base1, base1 + step, base1 + step * 2, ... } */
- rtx base0 = builder.elt (0);
- rtx base1 = builder.elt (1);
- rtx base2 = builder.elt (2);
-
- rtx step = simplify_binary_operation (MINUS, builder.inner_mode (),
- base2, base1);
-
- /* Step 1 - { base1, base1 + step, base1 + step * 2, ... } */
- rtx tmp = gen_reg_rtx (mode);
- expand_vec_series (tmp, base1, step);
- /* Step 2 - { base0, base1, base1 + step, base1 + step * 2, ... } */
- if (!rtx_equal_p (base0, const0_rtx))
- base0 = force_reg (builder.inner_mode (), base0);
-
- insn_code icode = optab_handler (vec_shl_insert_optab, mode);
- gcc_assert (icode != CODE_FOR_nothing);
- emit_insn (GEN_FCN (icode) (target, tmp, base0));
- }
else
/* TODO: We will enable more variable-length vector in the future. */
gcc_unreachable ();
@@ -3580,6 +3558,10 @@ shuffle_extract_and_slide1up_patterns (struct
expand_vec_perm_d *d)
return true;
}
+/* This looks for a series pattern in the provided vector permute structure D.
+ If successful it emits a series insn as well as a gather to implement it.
+ Return true if successful, false otherwise. */
+
static bool
shuffle_series_patterns (struct expand_vec_perm_d *d)
{
