On Fri, 30 May 2014, Janne Grunau wrote:
Disable the VC-1 motion compensation NEON asm which is the only part
using that directive. The integrated assembler in the upcoming clang 3.5
does not support .dn/.qn without plans to change that. Too much effort
to implement it while it is rarely used.
http://llvm.org/bugs/show_bug.cgi?id=18199.
---
configure | 6 ++++++
libavcodec/arm/vc1dsp_init_neon.c | 4 ++++
libavcodec/arm/vc1dsp_neon.S | 4 ++++
3 files changed, 14 insertions(+)
diff --git a/configure b/configure
index 9c6109e..a148b93 100755
--- a/configure
+++ b/configure
@@ -1467,6 +1467,7 @@ SYSTEM_FUNCS="
"
TOOLCHAIN_FEATURES="
+ as_dn_directive
asm_mod_q
attribute_may_alias
attribute_packed
@@ -3767,6 +3768,11 @@ EOF
check_inline_asm asm_mod_q '"add r0, %Q0, %R0" :: "r"((long long)0)'
+ check_as <<EOF && enable as_dn_directive
+ra .dn d0.i16
+.unreq ra
+EOF
Is this executed at the point where gas-preprocessor is set up (for the
cases where we automatically enable it)?
If it is, so that this detects the fact that gas-pp can handle .dn
properly, the patch is ok.
// Martin
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