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target/arm: Convert CLZ

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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>
This commit is contained in:
Richard Henderson 2019-09-04 12:30:06 -07:00 • committed by Peter Maydell
parent 4ed95abd70
commit 4c97f5b2f0
3 changed files with 24 additions and 16 deletions
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4
target/arm/a32.decode
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@ -29,6 +29,7 @@
&s_rrrr s rd rn rm ra
&rrrr rd rn rm ra
&rrr rd rn rm
&rr rd rm
&r rm
&msr_reg rn r mask
&mrs_reg rd r
@ -197,6 +198,7 @@ CRC32CW .... 0001 0100 .... .... 0010 0100 .... @rndm
%sysm 8:1 16:4
@rm ---- .... .... .... .... .... .... rm:4 &r
@rdm ---- .... .... .... rd:4 .... .... rm:4 &rr
MRS_bank ---- 0001 0 r:1 00 .... rd:4 001. 0000 0000 &mrs_bank %sysm
MSR_bank ---- 0001 0 r:1 10 .... 1111 001. 0000 rn:4 &msr_bank %sysm
@ -207,3 +209,5 @@ MSR_reg ---- 0001 0 r:1 10 mask:4 1111 0000 0000 rn:4 &msr_reg
BX .... 0001 0010 1111 1111 1111 0001 .... @rm
BXJ .... 0001 0010 1111 1111 1111 0010 .... @rm
BLX_r .... 0001 0010 1111 1111 1111 0011 .... @rm
CLZ .... 0001 0110 1111 .... 1111 0001 .... @rdm