Initial Release

src/rp2_common/pico_int64_ops/CMakeLists.txt

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+if (NOT TARGET pico_int64_ops)
+
+    #shims for ROM functions for -lgcc functions  (listed below)
+    add_library(pico_int64_ops INTERFACE)
+
+    # no custom implementation; falls thru to compiler
+    add_library(pico_int64_ops_compiler INTERFACE)
+    # PICO_BUILD_DEFINE: PICO_INT64_OPS_COMPILER, whether compiler provided int64_ops multiplication support is being used, type=bool, default=0, but dependent on CMake options, group=pico_int64_ops
+    target_compile_definitions(pico_int64_ops_compiler INTERFACE
+            PICO_INT64_OPS_COMPILER=1
+            )
+
+    # add alias "default" which is just pico.
+    add_library(pico_int64_ops_default INTERFACE)
+    target_link_libraries(pico_int64_ops_default INTERFACE pico_int64_ops_pico)
+
+    set(PICO_DEFAULT_INT64_OPS_IMPL pico_int64_ops_default)
+
+    target_link_libraries(pico_int64_ops INTERFACE
+            $<IF:$<BOOL:$<TARGET_PROPERTY:PICO_TARGET_INT64_OPS_IMPL>>,$<TARGET_PROPERTY:PICO_TARGET_INT64_OPS_IMPL>,${PICO_DEFAULT_INT64_OPS_IMPL}>)
+
+    add_library(pico_int64_ops_pico INTERFACE)
+    target_include_directories(pico_int64_ops_pico INTERFACE ${CMAKE_CURRENT_LIST_DIR}/include)
+
+    target_sources(pico_int64_ops_pico INTERFACE
+            ${CMAKE_CURRENT_LIST_DIR}/pico_int64_ops_aeabi.S
+    )
+
+    # PICO_BUILD_DEFINE: PICO_INT64_OPS_PICO, whether optimized pico/bootrom provided int64_ops multiplication support is being used, type=bool, default=1, but dependent on CMake options, group=pico_int64_ops
+    target_compile_definitions(pico_int64_ops_pico INTERFACE
+            PICO_INT64_OPS_PICO=1
+            )
+
+    pico_wrap_function(pico_int64_ops_pico __aeabi_lmul)
+
+    macro(pico_set_int64_ops_implementation TARGET IMPL)
+        get_target_property(target_type ${TARGET} TYPE)
+        if ("EXECUTABLE" STREQUAL "${target_type}")
+            set_target_properties(${TARGET} PROPERTIES PICO_TARGET_INT64_OPS_IMPL "pico_int64_ops_${IMPL}")
+        else()
+            message(FATAL_ERROR "int64_ops implementation must be set on executable not library")
+        endif()
+    endmacro()
+endif()

src/rp2_common/pico_int64_ops/include/pico/int64_ops.h

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef _PICO_INT64_H
+#define _PICO_INT64_H
+
+#include "pico/types.h"
+
+/** \file int64_ops.h
+ *  \defgroup pico_int64_ops pico_int64_ops
+ *
+ * Optimized replacement implementations of the compiler built-in 64 bit multiplication
+ *
+ * This library does not provide any additional functions
+*/
+
+#endif

src/rp2_common/pico_int64_ops/pico_int64_ops_aeabi.S

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+/*
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+.syntax unified
+.cpu cortex-m0plus
+.thumb
+
+#include "pico/asm_helper.S"
+
+.section SECTION_NAME(__aeabi_lmul)
+wrapper_func __aeabi_lmul
+    muls   r1, r2
+    muls   r3, r0
+    adds   r1, r3
+    mov    r12, r1
+    lsrs   r1, r2, #16
+    uxth   r3, r0
+    muls   r3, r1
+    push   {r4}
+    lsrs   r4, r0, #16
+    muls   r1, r4
+    uxth   r2, r2
+    uxth   r0, r0
+    muls   r0, r2
+    muls   r2, r4
+    lsls   r4, r3, #16
+    lsrs   r3, #16
+    adds   r0, r4
+    pop    {r4}
+    adcs   r1, r3
+    lsls   r3, r2, #16
+    lsrs   r2, #16
+    adds   r0, r3
+    adcs   r1, r2
+    add    r1, r12
+    bx lr
+