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target/riscv: Add zext.h instructions to Zbb, removing pack/packu/packh

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The 1.0.0 version of Zbb does not contain pack/packu/packh. However, a
zext.h instruction is provided (built on pack/packh from pre-0.93
draft-B) is available.

This commit adds zext.h and removes the pack* instructions.

Note that the encodings for zext.h are different between RV32 and
RV64, which is handled through REQUIRE_32BIT.

Signed-off-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210911140016.834071-15-philipp.tomsich@vrull.eu
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Philipp Tomsich 2021-09-11 16:00:14 +02:00 • committed by Alistair Francis
parent a1095bdcb0
commit 06dfa8a5c5
2 changed files with 21 additions and 77 deletions
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12
target/riscv/insn32.decode
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@ -692,6 +692,9 @@ rori 01100 ............ 101 ..... 0010011 @sh
sext_b 011000 000100 ..... 001 ..... 0010011 @r2
sext_h 011000 000101 ..... 001 ..... 0010011 @r2
xnor 0100000 .......... 100 ..... 0110011 @r
# The encoding for zext.h differs between RV32 and RV64.
# zext_h_32 denotes the RV32 variant.
zext_h_32 0000100 00000 ..... 100 ..... 0110011 @r2
# *** RV64 Zbb Standard Extension (in addition to RV32 Zbb) ***
clzw 0110000 00000 ..... 001 ..... 0011011 @r2
@ -704,15 +707,14 @@ rev8_64 011010 111000 ..... 101 ..... 0010011 @r2
rolw 0110000 .......... 001 ..... 0111011 @r
roriw 0110000 .......... 101 ..... 0011011 @sh5
rorw 0110000 .......... 101 ..... 0111011 @r
# The encoding for zext.h differs between RV32 and RV64.
# When executing on RV64, the encoding used in RV32 is an illegal
# instruction, so we use different handler functions to differentiate.
zext_h_64 0000100 00000 ..... 100 ..... 0111011 @r2
# *** RV32B Standard Extension ***
pack 0000100 .......... 100 ..... 0110011 @r
packu 0100100 .......... 100 ..... 0110011 @r
packh 0000100 .......... 111 ..... 0110011 @r
# *** RV64B Standard Extension (in addition to RV32B) ***
packw 0000100 .......... 100 ..... 0111011 @r
packuw 0100100 .......... 100 ..... 0111011 @r
# *** RV32 Zbc Standard Extension ***
clmul 0000101 .......... 001 ..... 0110011 @r