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| author | Andrew Waterman <andrew@sifive.com> | 2020-12-29 06:37:37 -0800 |
|---|---|---|
| committer | Andrew Waterman <andrew@sifive.com> | 2020-12-29 06:37:37 -0800 |
| commit | 9671dc573cbca478c6570771f16ba6741e815fa1 (patch) | |
| tree | 80dec3dc828514d7e2a44b82799232f570413607 | |
| parent | 29829bb3266866ba2ec742c34857b02a04b5405e (diff) | |
| download | riscv-isa-sim-9671dc573cbca478c6570771f16ba6741e815fa1.zip riscv-isa-sim-9671dc573cbca478c6570771f16ba6741e815fa1.tar.gz riscv-isa-sim-9671dc573cbca478c6570771f16ba6741e815fa1.tar.bz2 | |
Add log2 helper function
| -rw-r--r-- | riscv/arith.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/riscv/arith.h b/riscv/arith.h index 72bb515..b900e27 100644 --- a/riscv/arith.h +++ b/riscv/arith.h @@ -166,4 +166,12 @@ static inline int clz(uint64_t val) return res; } +static inline int log2(uint64_t val) +{ + if (!val) + return 0; + + return 63 - clz(val); +} + #endif |