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authorNikos Nikoleris <nikos.nikoleris@arm.com>2019-05-26 23:31:22 +0100
committerNikos Nikoleris <nikos.nikoleris@arm.com>2019-06-10 17:36:55 +0000
commit542fd370b285b0bd0e13ffa186e46e128e84273f (patch)
treefc2c0c6c570eeb186d8eb7462d9b91fdaefb28bd /src/base
parentec50225a654ddaedfcc6608409af496bab1d41c1 (diff)
downloadgem5-542fd370b285b0bd0e13ffa186e46e128e84273f.tar.xz
base: Add function to count trailing zeros in a 64-bit integer
Change-Id: Iaad0679b403bc5015ffeacbf7284313e41a36cd0 Signed-off-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/19128 Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br> Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Jason Lowe-Power <jason@lowepower.com> Tested-by: kokoro <noreply+kokoro@google.com>
Diffstat (limited to 'src/base')
-rw-r--r--src/base/bitfield.hh13
1 files changed, 12 insertions, 1 deletions
diff --git a/src/base/bitfield.hh b/src/base/bitfield.hh
index ec1ffce50..59b239a88 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
@@ -293,4 +293,15 @@ inline int ctz32(uint32_t value)
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)
+{
+ return value ? __builtin_ctzll(value) : 64;
+}
+
#endif // __BASE_BITFIELD_HH__