[PULL,24/44] target/riscv: rvv: Add option 'rvv_ma_all_1s' to enable optional mask agnostic behavior

Commit Message

Alistair Francis Sept. 7, 2022, 8:03 a.m. UTC

From: eopXD <[e-mail]>

According to v-spec, mask agnostic behavior can be either kept as
undisturbed or set elements' bits to all 1s. To distinguish the
difference of mask policies, QEMU should be able to simulate the mask
agnostic behavior as "set mask 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 mask policies. Setting agnostic elements to
all 1s allows QEMU to express this.

This commit adds option 'rvv_ma_all_1s' is added to enable the
behavior, it is default as disabled.

Signed-off-by: eop Chen <[e-mail]>
Reviewed-by: Frank Chang <[e-mail]>
Reviewed-by: Weiwei Li <[e-mail]>
Reviewed-by: Alistair Francis <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Alistair Francis <[e-mail]>
---
 target/riscv/cpu.c | 1 +
 1 file changed, 1 insertion(+)

Patch

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 117d308ae5..966e5f2dd7 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -1061,6 +1061,7 @@  static Property riscv_cpu_properties[] = {
     DEFINE_PROP_BOOL("short-isa-string", RISCVCPU, cfg.short_isa_string, false),
 
     DEFINE_PROP_BOOL("rvv_ta_all_1s", RISCVCPU, cfg.rvv_ta_all_1s, false),
+    DEFINE_PROP_BOOL("rvv_ma_all_1s", RISCVCPU, cfg.rvv_ma_all_1s, false),
     DEFINE_PROP_END_OF_LIST(),
 };