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restore ability to do comptime math

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until https://github.com/ziglang/zig/issues/6168 is implemented,
partially revert 0bd53dd203
in order to restore the ability to use std.math in comptime functions.
This commit is contained in:
xavier
2020-10-07 20:43:42 +02:00
committed by Andrew Kelley
parent 95a37373e9
commit a0a834a2f2
1 changed files with 12 additions and 1 deletions
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13
lib/std/math.zig
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@@ -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)));
}