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arm: swscale: Only compile the rgb2yuv asm if .dn aliases are supported

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Vanilla clang supports altmacro since clang 5.0, and thus doesn't
require gas-preprocessor for building the arm assembly any longer.

However, the built-in assembler doesn't support .dn directives.

This readds checks that were removed in d7320ca3ed, when
the last usage of .dn directives within libav were removed.

Alternatively, the assembly could be rewritten to not use the
.dn directive, making it available to clang users.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2018-03-31 21:54:32 +03:00
parent 0c25caa470
commit f33f728470
4 changed files with 14 additions and 0 deletions
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2
configure vendored
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@ -2149,6 +2149,7 @@ SYSTEM_LIBRARIES="
TOOLCHAIN_FEATURES="
as_arch_directive
as_dn_directive
as_fpu_directive
as_func
as_object_arch
@ -5530,6 +5531,7 @@ EOF
check_inline_asm asm_mod_q '"add r0, %Q0, %R0" :: "r"((long long)0)'
check_as as_arch_directive ".arch armv7-a"
check_as as_dn_directive "ra .dn d0.i16"
check_as as_fpu_directive ".fpu neon"
# llvm's integrated assembler supports .object_arch from llvm 3.5

3
libswscale/arm/rgb2yuv_neon_16.S
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@ -18,6 +18,8 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#if HAVE_AS_DN_DIRECTIVE
#include "rgb2yuv_neon_common.S"
/* downsampled R16G16B16 x8 */
@ -78,3 +80,4 @@ alias_qw c8x8x2, q10
.endm
loop_420sp rgbx, nv12, init, kernel_420_16x2, 16
#endif

3
libswscale/arm/rgb2yuv_neon_32.S
View File

@ -18,6 +18,8 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#if HAVE_AS_DN_DIRECTIVE
#include "rgb2yuv_neon_common.S"
/* downsampled R16G16B16 x8 */
@ -117,3 +119,4 @@ alias_qw c8x8x2, q10
loop_420sp rgbx, nv12, init, kernel_420_16x2, 32
#endif

6
libswscale/arm/swscale_unscaled.c
View File

@ -23,6 +23,7 @@
#include "libswscale/swscale_internal.h"
#include "libavutil/arm/cpu.h"
#if HAVE_AS_DN_DIRECTIVE
extern void rgbx_to_nv12_neon_32(const uint8_t *src, uint8_t *y, uint8_t *chroma,
int width, int height,
int y_stride, int c_stride, int src_stride,
@ -178,3 +179,8 @@ void ff_get_unscaled_swscale_arm(SwsContext *c)
if (have_neon(cpu_flags))
get_unscaled_swscale_neon(c);
}
#else
void ff_get_unscaled_swscale_arm(SwsContext *c)
{
}
#endif