From 30b75ae3539128cf7f12ef84db15ad91f54f0de2 Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Sat, 30 Jun 2018 01:44:54 +0200
Subject: [PATCH] add std.math f16 isfinite support

refs #1122
---
 std/math/isfinite.zig | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/std/math/isfinite.zig b/std/math/isfinite.zig
index 37ead03bba..3a5d4f01bb 100644
--- a/std/math/isfinite.zig
+++ b/std/math/isfinite.zig
@@ -5,6 +5,10 @@ const assert = std.debug.assert;
 pub fn isFinite(x: var) bool {
     const T = @typeOf(x);
     switch (T) {
+        f16 => {
+            const bits = @bitCast(u16, x);
+            return bits & 0x7FFF < 0x7C00;
+        },
         f32 => {
             const bits = @bitCast(u32, x);
             return bits & 0x7FFFFFFF < 0x7F800000;
@@ -20,10 +24,14 @@ pub fn isFinite(x: var) bool {
 }
 
 test "math.isFinite" {
+    assert(isFinite(f16(0.0)));
+    assert(isFinite(f16(-0.0)));
     assert(isFinite(f32(0.0)));
     assert(isFinite(f32(-0.0)));
     assert(isFinite(f64(0.0)));
     assert(isFinite(f64(-0.0)));
+    assert(!isFinite(math.inf(f16)));
+    assert(!isFinite(-math.inf(f16)));
     assert(!isFinite(math.inf(f32)));
     assert(!isFinite(-math.inf(f32)));
     assert(!isFinite(math.inf(f64)));