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[PATCH] decodetree.rst: add hint about format reuse with '.'
From: |
Daniel Henrique Barboza |
Subject: |
[PATCH] decodetree.rst: add hint about format reuse with '.' |
Date: |
Thu, 14 Jul 2022 16:59:17 -0300 |
This observation came up during the review of "Move tlbie[l] to decode
tree" patch [1] and it seems useful enough to be added in the docs.
[1] https://lists.gnu.org/archive/html/qemu-devel/2022-07/msg02195.html
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
docs/devel/decodetree.rst | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/docs/devel/decodetree.rst b/docs/devel/decodetree.rst
index 49ea50c2a7..6bcb94f449 100644
--- a/docs/devel/decodetree.rst
+++ b/docs/devel/decodetree.rst
@@ -110,7 +110,9 @@ A *fixedbit_elt* describes a contiguous sequence of bits
that must
be 1, 0, or don't care. The difference between '.' and '-'
is that '.' means that the bit will be covered with a field or a
final 0 or 1 from the pattern, and '-' means that the bit is really
-ignored by the cpu and will not be specified.
+ignored by the cpu and will not be specified. The same format can
+be reused in multiple patterns by using '.' and let the pattern
+decide whether the given bit will be ignored or not.
A *field_elt* describes a simple field only given a width; the position of
the field is implied by its position with respect to other *fixedbit_elt*
--
2.36.1
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