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| author |  Jason Gross <jgross@mit.edu> | 2019-04-02 17:51:17 -0400 |
|---|---|---|
| committer | Jason Gross <jgross@mit.edu> | 2019-04-02 17:51:17 -0400 |
| commit | ef3ce824f87fd11eed78a13a884579499a8ffc53 (patch) | |
| tree | a6af1f34cffc7dedee718e263f6e5d2751eaf28c /src/Util/ZUtil/Definitions.v | |
| parent | bacfa270c0c492ef8518d360d87e46cee292474f (diff) | |
Add Z.combine_at_bitwidth
Diffstat (limited to 'src/Util/ZUtil/Definitions.v')
| -rw-r--r-- | src/Util/ZUtil/Definitions.v | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/Util/ZUtil/Definitions.v b/src/Util/ZUtil/Definitions.v index 8fe5772f5..a5ac1a95b 100644 --- a/src/Util/ZUtil/Definitions.v +++ b/src/Util/ZUtil/Definitions.v @@ -85,6 +85,9 @@ Module Z. then mul_split_at_bitwidth (Z.log2 s) x y else ((x * y) mod s, (x * y) / s). + Definition combine_at_bitwidth (bitwidth lo hi : Z) : Z + := lo + (hi << bitwidth). + (** if positive, round up to 2^k-1 (0b11111....); if negative, round down to -2^k (0b...111000000...) *) Definition round_lor_land_bound (x : Z) : Z := if (0 <=? x)%Z |