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[PATCH qemu v14 15/15] target/riscv: rvv: Add option 'rvv_ta_all_1s' to
From: |
~eopxd |
Subject: |
[PATCH qemu v14 15/15] target/riscv: rvv: Add option 'rvv_ta_all_1s' to enable optional tail agnostic behavior |
Date: |
Wed, 27 Apr 2022 20:26:40 -0700 |
From: eopXD <eop.chen@sifive.com>
According to v-spec, tail agnostic behavior can be either kept as
undisturbed or set elements' bits to all 1s. To distinguish the
difference of tail policies, QEMU should be able to simulate the tail
agnostic behavior as "set tail elements' bits to all 1s".
There are multiple possibility for agnostic elements according to
v-spec. The main intent of this patch-set tries to add option that
can distinguish between tail policies. Setting agnostic elements to
all 1s allows QEMU to express this.
This commit adds option 'rvv_ta_all_1s' is added to enable the
behavior, it is default as disabled.
Signed-off-by: eop Chen <eop.chen@sifive.com>
Reviewed-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Weiwei Li <liweiwei@iscas.ac.cn>
---
target/riscv/cpu.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index ddda4906ff..cd4cf4b41e 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -810,6 +810,7 @@ static Property riscv_cpu_properties[] = {
DEFINE_PROP_BOOL("x-aia", RISCVCPU, cfg.aia, false),
DEFINE_PROP_UINT64("resetvec", RISCVCPU, cfg.resetvec, DEFAULT_RSTVEC),
+ DEFINE_PROP_BOOL("rvv_ta_all_1s", RISCVCPU, cfg.rvv_ta_all_1s, false),
DEFINE_PROP_END_OF_LIST(),
};
--
2.34.2
- [PATCH qemu v14 12/15] target/riscv: rvv: Add tail agnostic for vector reduction instructions, (continued)
- [PATCH qemu v14 12/15] target/riscv: rvv: Add tail agnostic for vector reduction instructions, ~eopxd, 2022/05/03
- [PATCH qemu v14 10/15] target/riscv: rvv: Add tail agnostic for vector fix-point arithmetic instructions, ~eopxd, 2022/05/03
- [PATCH qemu v14 09/15] target/riscv: rvv: Add tail agnostic for vector integer merge and move instructions, ~eopxd, 2022/05/03
- [PATCH qemu v14 13/15] target/riscv: rvv: Add tail agnostic for vector mask instructions, ~eopxd, 2022/05/03
- [PATCH qemu v14 14/15] target/riscv: rvv: Add tail agnostic for vector permutation instructions, ~eopxd, 2022/05/03
- [PATCH qemu v14 15/15] target/riscv: rvv: Add option 'rvv_ta_all_1s' to enable optional tail agnostic behavior,
~eopxd <=
- [PATCH qemu v14 11/15] target/riscv: rvv: Add tail agnostic for vector floating-point instructions, ~eopxd, 2022/05/03
- Re: [PATCH qemu v14 00/15] Add tail agnostic behavior for rvv instructions, Alistair Francis, 2022/05/10