guix/gnu/packages/patches/fuzzylite-soften-float-equality.patch

Origin: https://salsa.debian.org/debian/fuzzylite/-/blob/debian/6.0+dfsg-6/debian/patches/when-testing-large-float-numbers-for-equ.patch
From: Johannes 'josch' Schauer <josch@debian.org>
Date: Sun, 3 Feb 2019 10:33:22 +0100
X-Dgit-Generated: 6.0+dfsg-2 80960ae38da9db032dfbfec6405398653e8205ff
Subject: when testing large float numbers for equality, use a larger epsilon


---

--- fuzzylite-6.0+dfsg.orig/fuzzylite/test/BenchmarkTest.cpp
+++ fuzzylite-6.0+dfsg/fuzzylite/test/BenchmarkTest.cpp
@@ -96,7 +96,17 @@ namespace fl {
         CHECK(Op::isEq(1.0, Benchmark::convert(1000.0, Benchmark::MilliSeconds, Benchmark::Seconds)));
         FL_LOG(Benchmark::convert(1000.0, Benchmark::MilliSeconds, Benchmark::Seconds));
 
-        CHECK(Op::isEq(35e9, Benchmark::convert(35, Benchmark::Seconds, Benchmark::NanoSeconds)));
+        scalar eps =
+#ifndef __i386__
+            fuzzylite::macheps();
+#else
+            // on i386, due to the 80bit x87 register, double floating point
+            // numbers are handled differently and thus the difference between
+            // 35e9 and the result of Benchmark::convert() will be 2.179e-6,
+            // which is greater than the default epsilon of 1e-6.
+            1e-5;
+#endif
+        CHECK(Op::isEq(35e9, Benchmark::convert(35, Benchmark::Seconds, Benchmark::NanoSeconds), eps));
         CHECK(Op::isEq(35, Benchmark::convert(35e9, Benchmark::NanoSeconds, Benchmark::Seconds)));
     }