Integrated: 8295159: DSO created with -ffast-math breaks Java floating-point arithmetic

[Andrew Haley]

On Tue, 11 Oct 2022 16:02:41 GMT, Andrew Haley <aph at openjdk.org> wrote:

> A bug in GCC causes shared libraries linked with -ffast-math to disable denormal arithmetic. This breaks Java's floating-point semantics.
> 
> The bug is https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55522
> 
> One solution is to save and restore the floating-point control word around System.loadLibrary(). This isn't perfect, because some shared library might load another shared library at runtime, but it's a lot better than what we do now. 
> 
> However, this fix is not complete. `dlopen()` is called from many places in the JDK. I guess the best thing to do is find and wrap them all. I'd like to hear people's opinions.

This pull request has now been integrated.

Changeset: df599dbb
Author:    Andrew Haley <aph at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/df599dbb9b0f0ee96d1ec767ac8821f164ab075d
Stats:     277 lines in 10 files changed: 275 ins; 0 del; 2 mod

8295159: DSO created with -ffast-math breaks Java floating-point arithmetic

Reviewed-by: ihse, dholmes, stuefe

-------------

PR: https://git.openjdk.org/jdk/pull/10661