Update `vrev` spec to match the HW behavior
Bug: 296323879
Change-Id: I7f29abd813a0bce80b1e2aef0d43532bd5414202
diff --git a/docs/kelvin_isa.md b/docs/kelvin_isa.md
index b00f3f5..c69d554 100644
--- a/docs/kelvin_isa.md
+++ b/docs/kelvin_isa.md
@@ -1609,6 +1609,8 @@
Generalized reverse using bit ladder.
+The size of the flip is based on the `log_2(data type)`
+
**Encodings**
vrev.[b,h,w].vv.{m} vd, vs1, vs2 \
@@ -1624,7 +1626,9 @@
if (shamt & 1) r = ((r & 0x55..) << 1) | ((r & 0xAA..) >> 1)
if (shamt & 2) r = ((r & 0x33..) << 2) | ((r & 0xCC..) >> 2)
if (shamt & 4) r = ((r & 0x0F..) << 4) | ((r & 0xF0..) >> 4)
+ if (sz == 0) vd[L] = r; continue;
if (shamt & 8) r = ((r & 0x00..) << 8) | ((r & 0xFF..) >> 8)
+ if (sz == 1) vd[L] = r; continue;
if (shamt & 16) r = ((r & 0x00..) << 16) | ((r & 0xFF..) >> 16)
vd[L] = r
```
