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[PATCH v2 08/12] target/riscv/vector_helper.c: use vlenb in HELPER(vsetv
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From: |
Daniel Henrique Barboza |
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Subject: |
[PATCH v2 08/12] target/riscv/vector_helper.c: use vlenb in HELPER(vsetvl) |
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Date: |
Mon, 15 Jan 2024 19:25:24 -0300 |
Use the new 'vlenb' CPU config to validate fractional LMUL. The original
comparison is done with 'vlen' and 'sew', both in bits. Adjust the shift
to use vlenb.
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
---
target/riscv/vector_helper.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
index cb944229b0..9e3ae4b5d3 100644
--- a/target/riscv/vector_helper.c
+++ b/target/riscv/vector_helper.c
@@ -45,9 +45,13 @@ target_ulong HELPER(vsetvl)(CPURISCVState *env, target_ulong
s1,
xlen - 1 - R_VTYPE_RESERVED_SHIFT);
if (lmul & 4) {
- /* Fractional LMUL - check LMUL * VLEN >= SEW */
+ /*
+ * Fractional LMUL: check VLEN * LMUL >= SEW,
+ * or VLEN * (8 - lmul) >= SEW. Using VLENB we
+ * need 3 less shifts rights.
+ */
if (lmul == 4 ||
- cpu->cfg.vlen >> (8 - lmul) < sew) {
+ cpu->cfg.vlenb >> (8 - 3 - lmul) < sew) {
vill = true;
}
}
--
2.43.0
- [PATCH v2 03/12] target/riscv/gdbstub.c: use 'vlenb' instead of shifting 'vlen', (continued)
- [PATCH v2 03/12] target/riscv/gdbstub.c: use 'vlenb' instead of shifting 'vlen', Daniel Henrique Barboza, 2024/01/15
- [PATCH v2 04/12] target/riscv/insn_trans/trans_rvbf16.c.inc: use cpu->cfg.vlenb, Daniel Henrique Barboza, 2024/01/15
- [PATCH v2 05/12] target/riscv/insn_trans/trans_rvv.c.inc: use 'vlenb', Daniel Henrique Barboza, 2024/01/15
- [PATCH v2 06/12] target/riscv/insn_trans/trans_rvvk.c.inc: use 'vlenb', Daniel Henrique Barboza, 2024/01/15
- [PATCH v2 07/12] target/riscv/vector_helper.c: use 'vlenb', Daniel Henrique Barboza, 2024/01/15
- [PATCH v2 08/12] target/riscv/vector_helper.c: use vlenb in HELPER(vsetvl),
Daniel Henrique Barboza <=
- [PATCH v2 09/12] target/riscv/cpu.h: use 'vlenb' in vext_get_vlmax(), Daniel Henrique Barboza, 2024/01/15
- [PATCH v2 10/12] target/riscv/insn_trans/trans_rvv.c.inc: use 'vlenb' in MAXSZ(), Daniel Henrique Barboza, 2024/01/15
- [PATCH v2 11/12] trans_rvv.c.inc: use 'vlenb' to calc vlmax in trans_vrgather_v*(), Daniel Henrique Barboza, 2024/01/15
- [PATCH v2 12/12] target/riscv/cpu.c: remove cpu->cfg.vlen, Daniel Henrique Barboza, 2024/01/15