https://bugs.freedesktop.org/show_bug.cgi?id=108856
Bug ID: 108856
Summary: floating-point-exceptions in gallium/auxiliary/tgsi/
functions
Product: Mesa
Version: 18.2
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/OSMesa
Assignee: mesa-dev@lists.freedesktop.org
Reporter: popi...@basilisk.fr
QA Contact: mesa-dev@lists.freedesktop.org
Calling the gallium osmesa implementation generates multiple floating-point
exceptions.
For example the src/gallium/auxiliary/tgsi/tgsi_exec.c:554, micro_rsq()
function contains the code:
dst->f[0] = 1.0f / sqrtf(src->f[0]);
and is sometimes called with src->f[0] == 0.
This is an important issue for (scientific) codes which typically turn
floating-point-exceptions on.
A workaround is to turn FPE off before each GL/OSmesa call and turn them back
on after.
Note that the non-gallium OSMesa implementation does not have this issue.
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