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Merge pull request #1975 from BenoitJGirard/master 

Fix std.math.powi so powi(x, +-0) = 1 for any x.
master
Andrew Kelley 2019-02-17 15:00:17 -05:00 committed by GitHub
parent 6cf38369d2 fcf65f06c4
commit de18ece294
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1 changed files with 8 additions and 1 deletions
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9
std/math/powi.zig
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@ -25,7 +25,7 @@ pub fn powi(comptime T: type, x: T, y: T) (error{
// powi(x, +-0) = 1 for any x
if (y == 0 or y == -0) {
return 0;
return 1;
}
switch (x) {
@ -174,4 +174,11 @@ test "math.powi.special" {
testing.expectError(error.Overflow, powi(u64, 2, 64));
testing.expectError(error.Overflow, powi(u17, 2, 17));
testing.expectError(error.Overflow, powi(u42, 2, 42));
testing.expect((try powi(u8, 6, 0)) == 1);
testing.expect((try powi(u16, 5, 0)) == 1);
testing.expect((try powi(u32, 12, 0)) == 1);
testing.expect((try powi(u64, 34, 0)) == 1);
testing.expect((try powi(u17, 16, 0)) == 1);
testing.expect((try powi(u42, 34, 0)) == 1);
}