tree fbf1a74a716d602d411bbf18761cc10686de137a
parent 85ba0becb631739a07716ebb0d7905a552263cb3
author Nicolas Capens <capn@google.com> 1644875116 -0500
committer Nicolas Capens <nicolascapens@google.com> 1644981264 +0000

Skip testing subnormals when flushed to zero

When flush-to-zero (FTZ) mode is enabled, std::nextafter() returns zero
when a subnormal gets passed in. This can cause infinite loops when
trying to iterate over a range.

The inc() function returns the next larger value which does not compare
equal to the input. The only exception is negative zero, which produces
positive zero, since the CPU still discerns between these two when FTZ
has been enabled.

Bug: b/169904252
Change-Id: Idff987a4c14bd4f778e940ec4fc4de26e0a74372
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/62869
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>