Optimizations for Xtensa LX7

Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>

silk/SigProc_FIX.h

@@ -635,6 +635,10 @@ static OPUS_INLINE opus_int64 silk_max_64(opus_int64 a, opus_int64 b)
 #include "mips/sigproc_fix_mipsr1.h"
 #endif
 
+#ifdef OPUS_XTENSA_LX7
+#include "xtensa/SigProc_FIX_lx7.h"
+#endif
+
 
 #ifdef  __cplusplus
 }

silk/macros.h

@@ -147,5 +147,9 @@ static OPUS_INLINE opus_int32 silk_CLZ32(opus_int32 in32)
 #include "arm/macros_arm64.h"
 #endif
 
+#ifdef OPUS_XTENSA_LX7
+#include "xtensa/macros_lx7.h"
+#endif
+
 #endif /* SILK_MACROS_H */
 

silk/xtensa/SigProc_FIX_lx7.h

@@ -0,0 +1,44 @@
+/***********************************************************************
+Copyright (C) 2025 Xiph.Org Foundation and contributors.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_SIGPROC_FIX_LX7_H
+#define SILK_SIGPROC_FIX_LX7_H
+
+#undef silk_SAT16
+static inline short int silk_SAT16_lx7(opus_int32 a)
+{
+    opus_int32 res;
+    __asm__(
+        "clamps %0, %1, 15\n\t"
+        : "=r"(res)
+        : "r"(a)
+    );
+    return res;
+}
+#define silk_SAT16(a) (silk_SAT16_lx7(a))
+
+#endif

silk/xtensa/macros_lx7.h

@@ -0,0 +1,78 @@
+/***********************************************************************
+Copyright (C) 2025 Xiph.Org Foundation and contributors.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_MACROS_LX7_H
+#define SILK_MACROS_LX7_H
+
+/* This macro only avoids the undefined behaviour from a left shift of
+   a negative value. It should only be used in macros that can't include
+   SigProc_FIX.h. In other cases, use silk_LSHIFT32(). */
+#define SAFE_SHL(a, b) ((opus_int32)((opus_uint32)(a) << (b)))
+
+/* (a32 * (opus_int32)((opus_int16)(b32))) >> 16 output have to be 32bit int */
+#undef silk_SMULWB
+static OPUS_INLINE opus_int32 silk_SMULWB_lx7(opus_int32 a32, opus_int32 b32)
+{
+    opus_int32 res;
+    __asm__(
+        "mulsh %0, %1, %2\n\t"
+        : "=r"(res)
+        : "r"(a32), "r"(SAFE_SHL(b32, 16))
+    );
+    return res;
+}
+#define silk_SMULWB(a32, b32) (silk_SMULWB_lx7(a32, b32))
+
+/* a32 + (b32 * (opus_int32)((opus_int16)(c32))) >> 16 output have to be 32bit int */
+#undef silk_SMLAWB
+#define silk_SMLAWB(a32, b32, c32) ((a32) + silk_SMULWB(b32, c32))
+
+/* (a32 * (b32 >> 16)) >> 16 */
+#undef silk_SMULWT
+static OPUS_INLINE opus_int32 silk_SMULWT_lx7(opus_int32 a32, opus_int32 b32)
+{
+    opus_int32 res;
+    __asm__(
+        "mulsh %0, %1, %2\n\t"
+        : "=r"(res)
+        : "r"(a32), "r"(SAFE_SHL(b32 >> 16, 16))
+    );
+    return res;
+}
+
+/* a32 + (b32 * (c32 >> 16)) >> 16 */
+#undef silk_SMLAWT
+#define silk_SMLAWT(a32, b32, c32) ((a32) + silk_SMULWT_lx7(b32, c32))
+
+#undef silk_CLZ32
+static OPUS_INLINE opus_int32 silk_CLZ32_lx7(opus_int32 in32)
+{
+    return __builtin_clz(in32);
+}
+#define silk_CLZ32(in32) (silk_CLZ32_lx7(in32))
+
+#endif