From 6fb04e7fb68117c7d00c8cfbefd251427a85775f Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Mon, 7 Feb 2022 12:14:45 +1000
Subject: [PATCH] endian: add an f64 bswap test

---
 test/endian.cpp | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/test/endian.cpp b/test/endian.cpp
index b9fc34ed..a5236431 100644
--- a/test/endian.cpp
+++ b/test/endian.cpp
@@ -21,19 +21,27 @@ main (void)
         tap.expect_eq (cruft::readle<std::uint64_t> (bytes), 0xefcdab8967452301, "readle<u64>");
     }
 
+    {
+        static constexpr u32 A = 0x11223344;
+        static constexpr u32 B = 0x44332211;
+
+        f32 const a_f = cruft::cast::bit<f32> (A);
+        f32 const b_f = cruft::bswap (a_f);
+        u32 const b_u = cruft::cast::bit<u32> (b_f);
+
+        tap.expect_eq (b_u, B, "f32 bswap");
+    }
 
     {
-        // try to byte swap the pattern for 1.0f
-        //
-        // it may not be the most robust test, but it'll catch the most
-        // egregious errors for the time being.
-        union {
-            uint32_t u;
-            float f;
-        } data { .u = 0x0000803f /* 0x3f800000 == 1.f */ };
+        static constexpr u64 A = 0x1122334455667788;
+        static constexpr u64 B = 0x8877665544332211;
 
-        tap.expect_eq (cruft::bswap (data.f), 1.f, "f32 byteswap");
-    };
+        f64 const a_f = cruft::cast::bit<f64> (A);
+        f64 const b_f = cruft::bswap (a_f);
+        u64 const b_u = cruft::cast::bit<u64> (b_f);
+
+        tap.expect_eq (b_u, B, "u64 bswap");
+    }
 
     return tap.status ();
 }
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