Nikos Nikoleris has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/19128
Change subject: base: Add function to count trailing zeros in a 64-bit
integer
......................................................................
base: Add function to count trailing zeros in a 64-bit integer
Change-Id: Iaad0679b403bc5015ffeacbf7284313e41a36cd0
Signed-off-by: Nikos Nikoleris <nikos.nikole...@arm.com>
---
M src/base/bitfield.hh
1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/src/base/bitfield.hh b/src/base/bitfield.hh
index ec1ffce..10b1e60 100644
--- a/src/base/bitfield.hh
+++ b/src/base/bitfield.hh
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2017 ARM Limited
+ * Copyright (c) 2017, 2019 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -47,6 +47,7 @@
#include <inttypes.h>
#include <cassert>
+#include <climits>
#include <cstddef>
#include <type_traits>
@@ -293,4 +294,19 @@
return value ? __builtin_ctz(value) : 32;
}
+/**
+ * Count trailing zeros in a 64-bit value.
+ *
+ * @param An input value
+ * @return The number of trailing zeros or 64 if the value is zero.
+ */
+inline int ctz64(uint64_t value)
+{
+#if ULONG_MAX == UINT64_MAX
+ return value ? __builtin_ctzl(value) : 64;
+#else
+ return value ? __builtin_ctzll(value) : 64;
+#endif
+}
+
#endif // __BASE_BITFIELD_HH__
--
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Gerrit-Project: public/gem5
Gerrit-Branch: master
Gerrit-Change-Id: Iaad0679b403bc5015ffeacbf7284313e41a36cd0
Gerrit-Change-Number: 19128
Gerrit-PatchSet: 1
Gerrit-Owner: Nikos Nikoleris <nikos.nikole...@arm.com>
Gerrit-MessageType: newchange
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