On Mon, Sep 5, 2016 at 12:55 PM, Bram Stolk <b.st...@gmail.com> wrote: > Hey, > > Do you guys test with Floating-Point-Exceptions enabled?
I think most people just test with whatever is the default. > Because on Intel-Haswell, I can trigger a FPE with a simple glClearColor and > glClear. > I think glClear is doing bad FP math on Haswell. > > https://software.intel.com/en-us/forums/graphics-driver-bug-reporting/topic/681580 Unfortunately you don't have any debug info for your mesa build. > > I recommend doing a: > > feenableexcept( FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW ); > > In your test-suite. I did that but was unable to trigger the error on a i7-920 CPU and an NVIDIA GPU (driven by nouveau) in some simple tests. Perhaps a change in how HSW reports errors, or could be a HSW- (or gen7+) specific code path. If you're able to, make a local build, adding -O0 to cflags, and don't strip the debug info. That should show you exactly where the issue lies. Separately, if you can make a small program that reproduces the issue for you (e.g. with glut + epoxy), that would help others test and figure out what's going on. -ilia P.S. for reference, this is the (whitespace-damaged) patch I applied to piglit for my testing: diff --git a/tests/util/piglit-framework-gl.h b/tests/util/piglit-framework-gl.h index 81c1a5e..1510fc1 100644 --- a/tests/util/piglit-framework-gl.h +++ b/tests/util/piglit-framework-gl.h @@ -235,6 +235,7 @@ void piglit_gl_test_run(int argc, char *argv[], const struct piglit_gl_test_config *config); +#include <fenv.h> #ifdef __cplusplus # define PIGLIT_EXTERN_C_BEGIN extern "C" { # define PIGLIT_EXTERN_C_END } @@ -263,6 +264,7 @@ piglit_gl_test_run(int argc, char *argv[], piglit_disable_error_message_boxes(); \ \ piglit_gl_test_config_init(&config); \ + feenableexcept( FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW ); \ \ config.init = piglit_init; \ config.display = piglit_display; \ _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
