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authorGabe Black <gblack@eecs.umich.edu>2006-10-26 20:25:22 -0400
committerGabe Black <gblack@eecs.umich.edu>2006-10-26 20:25:22 -0400
commitf88b90dd564f59ca0f045df6f12c87185cbef687 (patch)
tree18c3d18197f75c279111b30d4bdf4e41705de331 /src
parentd1b30102fdaa79b9937e9405aeade54a72685746 (diff)
downloadgem5-f88b90dd564f59ca0f045df6f12c87185cbef687.tar.xz
Added a few functions to stuff values into bitfields in an instruction.
--HG-- extra : convert_revision : 507d7e13fd6276acf36b75eba31dff5e8080113f
Diffstat (limited to 'src')
-rw-r--r--src/base/bitfield.hh24
1 files changed, 24 insertions, 0 deletions
diff --git a/src/base/bitfield.hh b/src/base/bitfield.hh
index 879780d56..177279678 100644
--- a/src/base/bitfield.hh
+++ b/src/base/bitfield.hh
@@ -69,4 +69,28 @@ sext(uint64_t val)
return sign_bit ? (val | ~mask(N)) : val;
}
+/**
+ * Return val with bits first to last set to bit_val
+ */
+template <class T, class B>
+inline
+T
+insertBits(T val, int first, int last, B bit_val)
+{
+ T bmask = mask(first - last + 1) << last;
+ return ((bit_val << last) & bmask) | (val & ~bmask);
+}
+
+/**
+ * A convenience function to replace bits first to last of val with bit_val
+ * in place.
+ */
+template <class T, class B>
+inline
+void
+replaceBits(T& val, int first, int last, B bit_val)
+{
+ val = insertBits(val, first, last, bit_val);
+}
+
#endif // __BASE_BITFIELD_HH__