From a0a834a2f292eb7f4170d590833b5d56084c0468 Mon Sep 17 00:00:00 2001
From: xavier <xavierb@gmail.com>
Date: Wed, 7 Oct 2020 20:43:42 +0200
Subject: restore ability to do comptime math

until https://github.com/ziglang/zig/issues/6168 is implemented,
partially revert 0bd53dd2033c60d3446abfb83209237c6eb6c9e2
in order to restore the ability to use std.math in comptime functions.
---
 lib/std/math.zig | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'lib/std/math.zig')

diff --git a/lib/std/math.zig b/lib/std/math.zig
index f05c967b2d..a1db1309c9 100644
--- a/lib/std/math.zig
+++ b/lib/std/math.zig
@@ -110,7 +110,12 @@ pub fn approxEq(comptime T: type, x: T, y: T, epsilon: T) bool {
 }
 
 pub fn doNotOptimizeAway(value: anytype) void {
-    mem.doNotOptimizeAway(value);
+    // TODO: use @declareSideEffect() when it is available.
+    // https://github.com/ziglang/zig/issues/6168
+    const T = @TypeOf(value);
+    var x: T = undefined;
+    const p = @ptrCast(*volatile T, &x);
+    p.* = x;
 }
 
 pub fn raiseInvalid() void {
@@ -1131,3 +1136,9 @@ test "compare between signed and unsigned" {
     testing.expect(!compare(@as(u8, 255), .eq, @as(i8, -1)));
     testing.expect(compare(@as(u8, 1), .eq, @as(u8, 1)));
 }
+
+test "math.comptime" {
+    comptime const v = sin(@as(f32, 1)) + ln(@as(f32, 5));
+    testing.expect(v == sin(@as(f32, 1)) + ln(@as(f32, 5)));
+}
+
-- 
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