ripemd160

commit 4fe3998c0d94dea7e059602747413d5825e34330
parent 84eaa4264fe5e638004ea42d2dedbc2d12b1df91
Author: Jared Tobin <jared@jtobin.io>
Date:   Mon, 22 Dec 2025 19:06:05 -0330

meta: add llvm flag

Diffstat:
M
README.md
 | 
22
+++++++++++-----------
M
flake.nix
 | 
4
++--
M
ppad-ripemd160.cabal
 | 
7
+++++++

3 files changed, 20 insertions(+), 13 deletions(-)
diff --git a/README.md b/README.md
@@ -58,25 +58,25 @@ Haddocks (API documentation, etc.) are hosted at
 The aim is best-in-class performance for pure, highly-auditable Haskell
 code.
 
-Current benchmark figures on my mid-2020 MacBook Air look like (use
+Current benchmark figures on my M4 Silicon MacBook Air look like (use
 `cabal bench` to run the benchmark suite):
 
 ```
   benchmarking ppad-ripemd160/RIPEMD160 (32B input)/hash
-  time                 786.6 ns   (778.0 ns .. 796.7 ns)
-                       0.999 R²   (0.999 R² .. 1.000 R²)
-  mean                 778.6 ns   (775.3 ns .. 784.2 ns)
-  std dev              13.85 ns   (9.858 ns .. 22.05 ns)
-  variance introduced by outliers: 20% (moderately inflated)
+  time                 244.2 ns   (244.0 ns .. 244.4 ns)
+                       1.000 R²   (1.000 R² .. 1.000 R²)
+  mean                 244.5 ns   (244.4 ns .. 244.7 ns)
+  std dev              522.8 ps   (355.8 ps .. 868.0 ps)
 
   benchmarking ppad-ripemd160/HMAC-RIPEMD160 (32B input)/hmac
-  time                 2.933 μs   (2.906 μs .. 2.974 μs)
-                       0.999 R²   (0.999 R² .. 0.999 R²)
-  mean                 3.002 μs   (2.978 μs .. 3.022 μs)
-  std dev              74.97 ns   (62.74 ns .. 89.91 ns)
-  variance introduced by outliers: 30% (moderately inflated)
+  time                 836.1 ns   (835.3 ns .. 837.0 ns)
+                       1.000 R²   (1.000 R² .. 1.000 R²)
+  mean                 836.6 ns   (835.6 ns .. 837.4 ns)
+  std dev              3.105 ns   (2.474 ns .. 4.117 ns)
 ```
 
+Compile with the 'llvm' flag for maximum performance.
+
 ## Security
 
 This library aims at the maximum security achievable in a
diff --git a/flake.nix b/flake.nix
@@ -25,6 +25,7 @@
 
         pkgs = import nixpkgs { inherit system; };
         hlib = pkgs.haskell.lib;
+        llvm = pkgs.llvmPackages_15.llvm;
 
         base16 = ppad-base16.packages.${system}.default;
 
@@ -50,10 +51,9 @@
             buildInputs = [
               cabal
               cc
+              llvm
             ];
 
-            inputsFrom = builtins.attrValues self.packages.${system};
-
             doBenchmark = true;
 
             shellHook = ''
diff --git a/ppad-ripemd160.cabal b/ppad-ripemd160.cabal
@@ -14,6 +14,11 @@ description:
   A pure implementation of RIPEMD-160 and HMAC-RIPEMD160 on strict and
   lazy ByteStrings.
 
+flag llvm
+  description: Use GHC's LLVM backend.
+  default:     False
+  manual:      True
+
 source-repository head
   type:     git
   location: git.ppad.tech/ripemd160.git
@@ -23,6 +28,8 @@ library
   hs-source-dirs:   lib
   ghc-options:
       -Wall
+  if flag(llvm)
+    ghc-options: -fllvm -O2
   exposed-modules:
       Crypto.Hash.RIPEMD160
   build-depends: