libFLAC : SSE optimisations.

Add new function:

    FLAC__lpc_compute_residual_from_qlp_coefficients_intrin_sse41()

and rewrite function:

    FLAC__lpc_compute_residual_from_qlp_coefficients_16_intrin_sse2()

Testing shows noticeable speed increase on Intel Core i3/5/7 (up to 30%
for -8 mode), AMD Athlon64, Phenom, Bulldozer/Piledriver, but no increase
or even very small speed decrease (~2% for -8 mode) on Intel Core2.

Patch-from: lvqcl <lvqcl.mail@gmail.com>

src/libFLAC/include/private/lpc.h

@@ -164,6 +164,7 @@ void FLAC__lpc_compute_residual_from_qlp_coefficients_16_intrin_sse2(const FLAC_
 void FLAC__lpc_compute_residual_from_qlp_coefficients_intrin_sse2(const FLAC__int32 *data, unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
 #    endif
 #    ifdef FLAC__SSE4_1_SUPPORTED
+void FLAC__lpc_compute_residual_from_qlp_coefficients_intrin_sse41(const FLAC__int32 *data, unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
 void FLAC__lpc_compute_residual_from_qlp_coefficients_wide_intrin_sse41(const FLAC__int32 *data, unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
 #    endif
 #  endif

src/libFLAC/stream_encoder.c

@@ -935,6 +935,8 @@ static FLAC__StreamEncoderInitStatus init_stream_internal_(
 				encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_intrin_sse_lag_12;
 			else if(encoder->protected_->max_lpc_order < 16)
 				encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_intrin_sse_lag_16;
+			else
+				encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation;
 		}
 #    endif
 #    ifdef FLAC__SSE2_SUPPORTED
@@ -944,6 +946,7 @@ static FLAC__StreamEncoderInitStatus init_stream_internal_(
 		}
 #     ifdef FLAC__SSE4_1_SUPPORTED
 		if(encoder->private_->cpuinfo.ia32.sse41) {
+			encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_intrin_sse41;
 			encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_64bit = FLAC__lpc_compute_residual_from_qlp_coefficients_wide_intrin_sse41;
 		}
 #     endif
@@ -977,6 +980,11 @@ static FLAC__StreamEncoderInitStatus init_stream_internal_(
 #    ifdef FLAC__SSE2_SUPPORTED
 		/* encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_intrin_sse2; // OPT_SSE: not faster than C; TODO: more tests on different CPUs */
 		encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_16_intrin_sse2;
+#     ifdef FLAC__SSE4_1_SUPPORTED
+		if(encoder->private_->cpuinfo.x86_64.sse41) {
+			encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_intrin_sse41;
+		}
+#     endif
 
 #     ifdef FLAC__SSSE3_SUPPORTED
 		if (encoder->private_->cpuinfo.x86_64.ssse3) {