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Diffstat (limited to 'src/b-st-ext.adoc')
| -rw-r--r-- | src/b-st-ext.adoc | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/b-st-ext.adoc b/src/b-st-ext.adoc index fa26a78..9b73fbc 100644 --- a/src/b-st-ext.adoc +++ b/src/b-st-ext.adoc @@ -2386,6 +2386,13 @@ Included in:: |Ratified |=== +NOTE: For RV32, the `pack` instruction with _rs2_=`x0` is the `zext.h` +instruction. +Hence, for RV32, any extension that contains the `pack` instruction also +contains the `zext.h` instruction (but not necessarily the `c.zext.h` +instruction, which is only guaranteed to exist if both the Zcb and Zbb +extensions are implemented). + <<< [#insns-packh,reftext="Pack low bytes of registers"] ==== packh @@ -2484,6 +2491,13 @@ Included in:: |Ratified |=== +NOTE: For RV64, the `packw` instruction with _rs2_=`x0` is the `zext.h` +instruction. +Hence, for RV64, any extension that contains the `packw` instruction also +contains the `zext.h` instruction (but not necessarily the `c.zext.h` +instruction, which is only guaranteed to exist if both the Zcb and Zbb +extensions are implemented). + <<< [#insns-rev8,reftext="Byte-reverse register"] ==== rev8 |