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std.conv.to!double wrong in some cases on aarch64 #4433
Description
v = "0.6".to!double;
writefln!"%x"(*cast(ulong*)&v);
I think the correct answer is 3fe3333333333333, which is what we get on dmd and ldc on x86_64, but ldc on aarch64 (macos) gives 3fe3333333333334
"1234567.89" & "12.3456789" also showed up in testing as different.
Activity
JohanEngelen commentedon Jul 9, 2023
couldn't this be due to some rounding mode difference?
John-Colvin commentedon Jul 9, 2023
Well maybe... but something is definitely off, because
strtodgives the right answer (3fe3333333333333).kinke commentedon Jul 10, 2023
The same result is obtained on Windows (tested with LDC v1.31), so if this is a bug, it's almost certainly in Phobos and related to 64-bit
real(on AArch64, only for Apple).Use strtod rather than to!double in lexnumerix's tests.