diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2019-09-04 12:30:06 -0700 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2019-09-05 13:23:03 +0100 |
| commit | 4c97f5b2f0fa9b37f9ff497f15411d809e6fd098 (patch) | |
| tree | bdc0e233ababc1904302d09171872ebc737671bf /target/arm/t32.decode | |
| parent | 4ed95abd700e43dee8e032f754b53bec2b047f75 (diff) | |
target/arm: Convert CLZ
Document our choice about the T32 CONSTRAINED UNPREDICTABLE behaviour.
This matches the undocumented choice made by the legacy decoder.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20190904193059.26202-17-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target/arm/t32.decode')
| -rw-r--r-- | target/arm/t32.decode | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/target/arm/t32.decode b/target/arm/t32.decode index 337706ebbe..67724efe4b 100644 --- a/target/arm/t32.decode +++ b/target/arm/t32.decode @@ -26,6 +26,7 @@ &s_rrrr !extern s rd rn rm ra &rrrr !extern rd rn rm ra &rrr !extern rd rn rm +&rr !extern rd rm &r !extern rm &msr_reg !extern rn r mask &mrs_reg !extern rd r @@ -126,6 +127,7 @@ RSB_rri 1111 0.0 1110 . .... 0 ... .... ........ @s_rri_rot @rnadm .... .... .... rn:4 ra:4 rd:4 .... rm:4 &rrrr @rn0dm .... .... .... rn:4 .... rd:4 .... rm:4 &rrrr ra=0 @rndm .... .... .... rn:4 .... rd:4 .... rm:4 &rrr +@rdm .... .... .... .... .... rd:4 .... rm:4 &rr { MUL 1111 1011 0000 .... 1111 .... 0000 .... @s0_rn0dm @@ -180,6 +182,9 @@ CRC32CB 1111 1010 1101 .... 1111 .... 1000 .... @rndm CRC32CH 1111 1010 1101 .... 1111 .... 1001 .... @rndm CRC32CW 1111 1010 1101 .... 1111 .... 1010 .... @rndm +# Note rn != rm is CONSTRAINED UNPREDICTABLE; we choose to ignore rn. +CLZ 1111 1010 1011 ---- 1111 .... 1000 .... @rdm + # Branches and miscellaneous control %msr_sysm 4:1 8:4 |