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Adds use of restrict keyword to improve encoding speed.

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Restrict works very poorly in Visual Studio (much slower than without)
so defined flac_restrict in share/compat.h and use that in:

    lpc_compute_residual...()
    lpc_restore_signal...()

As a result, FLAC__lpc_compute_residual_from_qlp_coefficients_wide_intrin_sse41()
offers no advantage for 64-bit compiles and was removed from x86-64 part
of stream_encoder.c

Patch-from: lvqcl <lvqcl.mail@gmail.com>
This commit is contained in:
Erik de Castro Lopo
2013-10-10 18:24:19 +11:00
parent a1abfa3df2
commit cf28c0144b
3 changed files with 13 additions and 8 deletions
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9
include/share/compat.h
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@@ -76,6 +76,15 @@
#define inline __inline
#endif
#if defined __INTEL_COMPILER || (defined _MSC_VER && defined _WIN64)
/* MSVS generates VERY slow 32-bit code with __restrict */
#define flac_restrict __restrict
#elif defined __GNUC__
#define flac_restrict __restrict__
#else
#define flac_restrict
#endif
/* adjust for compilers that can't understand using LLU suffix for uint64_t literals */
#ifdef _MSC_VER
#define FLAC__U64L(x) x