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| author | Nick Desaulniers <ndesaulniers@google.com> | 2019-07-22 15:31:05 -0700 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-07-30 23:18:33 -0500 |
| commit | 0f0727d971f6fdf8f1077180d495ddb9928f0c8b (patch) | |
| tree | c8a1ce04004038ef7e4ff58a72b472923050f66b /drivers/gpu/drm/amd/display/dc/dsc/Makefile | |
| parent | 4cab85afe9d7903936ef86ef143e37440cb8fc98 (diff) | |
| download | linux-0f0727d971f6fdf8f1077180d495ddb9928f0c8b.tar.bz2 | |
drm/amd/display: readd -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines
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 for Clang.
This was originally landed in:
commit 10117450735c ("drm/amd/display: add -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines")
but reverted in:
commit 193392ed9f69 ("Revert "drm/amd/display: add -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines"")
due to bugreports from GCC builds. Add guards to only do so for Clang.
Link: https://bugs.freedesktop.org/show_bug.cgi?id=109487
Link: https://github.com/ClangBuiltLinux/linux/issues/327
Suggested-by: Sedat Dilek <sedat.dilek@gmail.com>
Suggested-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dsc/Makefile')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dsc/Makefile | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dsc/Makefile b/drivers/gpu/drm/amd/display/dc/dsc/Makefile index e019cd9447e8..17db603f2d1f 100644 --- a/drivers/gpu/drm/amd/display/dc/dsc/Makefile +++ b/drivers/gpu/drm/amd/display/dc/dsc/Makefile @@ -9,6 +9,10 @@ endif dsc_ccflags := -mhard-float -msse $(cc_stack_align) +ifdef CONFIG_CC_IS_CLANG +dsc_ccflags += -msse2 +endif + CFLAGS_rc_calc.o := $(dsc_ccflags) CFLAGS_rc_calc_dpi.o := $(dsc_ccflags) CFLAGS_codec_main_amd.o := $(dsc_ccflags) |