diff options
| author | Frédéric Pétrot <frederic.petrot@univ-grenoble-alpes.fr> | 2022-01-06 22:01:04 +0100 |
|---|---|---|
| committer | Alistair Francis <alistair.francis@wdc.com> | 2022-01-08 15:46:10 +1000 |
| commit | b3a5d1fbebab2098d0c3cdd3732c25f5cfbe5cbc (patch) | |
| tree | de45abe8d17924f957c7f02a41f724bfbfc7724d /target/riscv/helper.h | |
| parent | 7fd40f8679ceed388d82902e9be05ae136cf09cd (diff) | |
target/riscv: support for 128-bit M extension
Mult are generated inline (using a cool trick pointed out by Richard), but
for div and rem, given the complexity of the implementation of these
instructions, we call helpers to produce their behavior. From an
implementation standpoint, the helpers return the low part of the results,
while the high part is temporarily stored in a dedicated field of cpu_env
that is used to update the architectural register in the generation wrapper.
Signed-off-by: Frédéric Pétrot <frederic.petrot@univ-grenoble-alpes.fr>
Co-authored-by: Fabien Portas <fabien.portas@grenoble-inp.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20220106210108.138226-15-frederic.petrot@univ-grenoble-alpes.fr
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Diffstat (limited to 'target/riscv/helper.h')
| -rw-r--r-- | target/riscv/helper.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/target/riscv/helper.h b/target/riscv/helper.h index c15497e4a1..a8ee8a362a 100644 --- a/target/riscv/helper.h +++ b/target/riscv/helper.h @@ -1101,3 +1101,9 @@ DEF_HELPER_5(vsext_vf2_d, void, ptr, ptr, ptr, env, i32) DEF_HELPER_5(vsext_vf4_w, void, ptr, ptr, ptr, env, i32) DEF_HELPER_5(vsext_vf4_d, void, ptr, ptr, ptr, env, i32) DEF_HELPER_5(vsext_vf8_d, void, ptr, ptr, ptr, env, i32) + +/* 128-bit integer multiplication and division */ +DEF_HELPER_5(divu_i128, tl, env, tl, tl, tl, tl) +DEF_HELPER_5(divs_i128, tl, env, tl, tl, tl, tl) +DEF_HELPER_5(remu_i128, tl, env, tl, tl, tl, tl) +DEF_HELPER_5(rems_i128, tl, env, tl, tl, tl, tl) |