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target/riscv: compressed encodings for sspush and sspopchk

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sspush/sspopchk have compressed encodings carved out of zcmops.
compressed sspush is designated as c.mop.1 while compressed sspopchk
is designated as c.mop.5.

Note that c.sspush x1 exists while c.sspush x5 doesn't. Similarly
c.sspopchk x5 exists while c.sspopchk x1 doesn't.

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
Co-developed-by: Jim Shu <jim.shu@sifive.com>
Co-developed-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20241008225010.1861630-18-debug@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Deepak Gupta 2024-10-08 15:50:07 -07:00 committed by Alistair Francis
parent f06bfe3dc3
commit 905c032417
1 changed files with 4 additions and 0 deletions
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4
target/riscv/insn16.decode
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@ -140,6 +140,10 @@ sw 110 ... ... .. ... 00 @cs_w
addi 000 . ..... ..... 01 @ci addi 000 . ..... ..... 01 @ci
addi 010 . ..... ..... 01 @c_li addi 010 . ..... ..... 01 @c_li
{ {
# c.sspush x1 carving out of zcmops
sspush 011 0 00001 00000 01 &r2_s rs2=1 rs1=0
# c.sspopchk x5 carving out of zcmops
sspopchk 011 0 00101 00000 01 &r2 rs1=5 rd=0
c_mop_n 011 0 0 n:3 1 00000 01 c_mop_n 011 0 0 n:3 1 00000 01
illegal 011 0 ----- 00000 01 # c.addi16sp and c.lui, RES nzimm=0 illegal 011 0 ----- 00000 01 # c.addi16sp and c.lui, RES nzimm=0
addi 011 . 00010 ..... 01 @c_addi16sp addi 011 . 00010 ..... 01 @c_addi16sp