On Tue, Jan 29, 2019 at 10:30:31AM -0500, Alex Deucher wrote: > On Fri, Jan 25, 2019 at 10:29 AM Wentland, Harry <harry.wentl...@amd.com> > wrote: > > > > On 2019-01-24 7:52 p.m., ndesaulni...@google.com wrote: > > > arch/x86/Makefile disables SSE and SSE2 for the whole kernel. The > > > AMDGPU drivers modified in this patch re-enable SSE but not SSE2. Turn > > > on SSE2 to support emitting double precision floating point instructions > > > rather than calls to non-existent (usually available from gcc_s or > > > compiler_rt) floating point helper routines. > > > > > > Link: > > > https://gcc.gnu.org/onlinedocs/gccint/Soft-float-library-routines.html > > > Link: https://github.com/ClangBuiltLinux/linux/issues/327 > > > Cc: sta...@vger.kernel.org # 4.19 > > > Reported-by: S, Shirish <shiris...@amd.com> > > > Reported-by: Matthias Kaehlcke <m...@google.com> > > > Suggested-by: James Y Knight <jykni...@google.com> > > > Suggested-by: Nathan Chancellor <natechancel...@gmail.com> > > > Signed-off-by: Nick Desaulniers <ndesaulni...@google.com> > > > Tested-by: Guenter Roeck <li...@roeck-us.net> > > > > Reviewed-by: Harry Wentland <harry.wentl...@amd.com> > > > > and applied. > > > > This patch causes a segfault: > https://bugs.freedesktop.org/show_bug.cgi?id=109487 > > Any ideas? >
Set -msse2 only for clang ? I suspect, though, that this might only solve the compile problem. If I understand correctly, the first warning in the log is due to BREAK_TO_DEBUGGER(), suggesting that something is seriously wrong. Maybe enabling sse2 results in different results from floating point operations. Unfortunately I don't have a system with the affected GPU, so I can't run any tests on real hardware. Unless someone can test with real hardware, I think we have no choice but to revert the patch. Guenter > Alex > > > Harry > > > > > --- > > > drivers/gpu/drm/amd/display/dc/calcs/Makefile | 2 +- > > > drivers/gpu/drm/amd/display/dc/dml/Makefile | 2 +- > > > 2 files changed, 2 insertions(+), 2 deletions(-) > > > > > > diff --git a/drivers/gpu/drm/amd/display/dc/calcs/Makefile > > > b/drivers/gpu/drm/amd/display/dc/calcs/Makefile > > > index 95f332ee3e7e..dc85a3c088af 100644 > > > --- a/drivers/gpu/drm/amd/display/dc/calcs/Makefile > > > +++ b/drivers/gpu/drm/amd/display/dc/calcs/Makefile > > > @@ -30,7 +30,7 @@ else ifneq ($(call cc-option, -mstack-alignment=16),) > > > cc_stack_align := -mstack-alignment=16 > > > endif > > > > > > -calcs_ccflags := -mhard-float -msse $(cc_stack_align) > > > +calcs_ccflags := -mhard-float -msse -msse2 $(cc_stack_align) > > > > > > CFLAGS_dcn_calcs.o := $(calcs_ccflags) > > > CFLAGS_dcn_calc_auto.o := $(calcs_ccflags) > > > diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile > > > b/drivers/gpu/drm/amd/display/dc/dml/Makefile > > > index d97ca6528f9d..33c7d7588712 100644 > > > --- a/drivers/gpu/drm/amd/display/dc/dml/Makefile > > > +++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile > > > @@ -30,7 +30,7 @@ else ifneq ($(call cc-option, -mstack-alignment=16),) > > > cc_stack_align := -mstack-alignment=16 > > > endif > > > > > > -dml_ccflags := -mhard-float -msse $(cc_stack_align) > > > +dml_ccflags := -mhard-float -msse -msse2 $(cc_stack_align) > > > > > > CFLAGS_display_mode_lib.o := $(dml_ccflags) > > > CFLAGS_display_pipe_clocks.o := $(dml_ccflags) > > > > > _______________________________________________ > > amd-gfx mailing list > > amd-...@lists.freedesktop.org > > https://lists.freedesktop.org/mailman/listinfo/amd-gfx _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
