perf: accelerate BLS12-381 deserialization with blst

CMakeLists.txt

@@ -111,6 +111,30 @@ set(MI_OVERRIDE     "off" CACHE STRING "")
 add_subdirectory(depends/relic)
 add_subdirectory(depends/mimalloc)
 
+# blst (depends/blst) provides an accelerated deserialization path for
+# BLS12-381 points. It is only usable on 64-bit little-endian x86_64/aarch64
+# hosts, where the bundled assembly is supported and relic's internal
+# field-element layout (6x64-bit little-endian limbs, Montgomery form with
+# R = 2^384) matches blst's exactly.
+if(EMSCRIPTEN)
+  set(BLST_SUPPORTED OFF)
+else()
+  string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" BLST_HOST_PROCESSOR)
+  if(BLST_HOST_PROCESSOR MATCHES "^(x86_64|amd64|aarch64|arm64)$" AND CMAKE_SIZEOF_VOID_P EQUAL 8)
+    set(BLST_SUPPORTED ON)
+  else()
+    set(BLST_SUPPORTED OFF)
+  endif()
+endif()
+option(USE_BLST "Use the bundled blst library to accelerate BLS12-381 deserialization" ${BLST_SUPPORTED})
+if(USE_BLST AND NOT BLST_SUPPORTED)
+  message(FATAL_ERROR "blst is not supported on this host (requires little-endian x86_64 or aarch64)")
+endif()
+message(STATUS "Use blst: ${USE_BLST}")
+if(USE_BLST)
+  add_subdirectory(depends/blst)
+endif()
+
 #message(STATUS "Patching Relic to make setjmp.h inclusion conditional")
 #
 #execute_process(

Makefile.am

@@ -28,7 +28,7 @@ CLEANFILES =
 
 include Makefile.bls.include
 
-CLEANFILES += $(LIBRELIC) $(LIBDASHBLS) $(LIBMIMALLOC)
+CLEANFILES += $(LIBRELIC) $(LIBDASHBLS) $(LIBMIMALLOC) $(LIBBLST)
 
 if USE_TESTS
 CLEANFILES += $(DASHBLS_RUNTEST)

Makefile.bls.include

@@ -52,9 +52,18 @@ libdashbls_la_CPPFLAGS = $(AM_CPPFLAGS) $(RELIC_INCLUDES) $(MIMALLOC_INCLUDES) $
 libdashbls_la_CXXFLAGS = $(AM_CXXFLAGS)
 libdashbls_la_LDFLAGS  = $(AM_LDFLAGS)
 
+if USE_BLST
+libdashbls_la_LIBADD += $(LIBBLST)
+libdashbls_la_CPPFLAGS += -DBLS_USE_BLST $(BLST_INCLUDES)
+endif
+
 include Makefile.mimalloc.include
 include Makefile.relic.include
 
+if USE_BLST
+include Makefile.blst.include
+endif
+
 if USE_TESTS
 include Makefile.test.include
 endif

Makefile.blst.include

@@ -0,0 +1,26 @@
+# Copyright (c) 2026 The Dash Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING.MIT or http://www.opensource.org/licenses/mit-license.php.
+
+LIBBLST = libblst.la
+
+# __BLST_PORTABLE__ compiles both the ADX and the generic x86_64 code paths
+# and selects between them at run time; it has no effect on aarch64.
+BLST_CPPFLAGS = -D__BLST_PORTABLE__
+
+BLST_INCLUDES = -I$(top_srcdir)/depends/blst/bindings
+
+BLST_H = \
+	depends/blst/bindings/blst.h \
+	depends/blst/bindings/blst_aux.h
+
+noinst_LTLIBRARIES += $(LIBBLST)
+
+libblst_la_SOURCES = \
+	$(BLST_H) \
+	depends/blst/src/server.c \
+	depends/blst/build/assembly.S
+
+libblst_la_CPPFLAGS = $(AM_CPPFLAGS) $(BLST_CPPFLAGS)
+libblst_la_CFLAGS   = $(AM_CFLAGS) -fno-builtin
+libblst_la_CCASFLAGS = $(AM_CCASFLAGS) $(BLST_CPPFLAGS)

configure.ac

@@ -89,6 +89,12 @@ AC_ARG_ENABLE([debug],
   [use_debug=$enableval],
   [use_debug=no])
 
+AC_ARG_ENABLE([blst],
+  [AS_HELP_STRING([--enable-blst],
+  [Use the bundled blst library to accelerate BLS12-381 deserialization [default=auto]])],
+  [use_blst=$enableval],
+  [use_blst=auto])
+
 AC_LANG_PUSH([C])
 
 dnl Check for a flag to turn compiler warnings into errors. This is helpful for checks which may
@@ -434,6 +440,36 @@ if test x$use_big_endian = xyes; then
   AC_DEFINE([BIGED],   [1], [Define this symbol if big-endian support is enabled])
 fi
 
+dnl blst provides an accelerated deserialization path for BLS12-381 points.
+dnl It is only usable on 64-bit little-endian x86_64/aarch64 hosts, where the
+dnl bundled assembly is supported and relic's internal field-element layout
+dnl (6x64-bit little-endian limbs, Montgomery form with R = 2^384) matches
+dnl blst's exactly.
+blst_supported=no
+if test x$use_big_endian != xyes; then
+  case $host_cpu in
+    x86_64|amd64|aarch64|arm64)
+      blst_supported=yes
+      ;;
+  esac
+fi
+case $use_blst in
+auto)
+  use_blst=$blst_supported
+  ;;
+yes)
+  if test x$blst_supported != xyes; then
+    AC_MSG_ERROR([blst is not supported on this host (requires little-endian x86_64 or aarch64)])
+  fi
+  ;;
+no)
+  ;;
+*)
+  AC_MSG_ERROR([invalid value for --enable-blst])
+  ;;
+esac
+AM_CONDITIONAL([USE_BLST], [test x"$use_blst" = x"yes"])
+
 use_pkgconfig=yes
 
 if test x"$use_optimizations" = x"yes"; then
@@ -899,6 +935,7 @@ echo
 echo "Options used to compile and link:"
 echo "  target os           = $TARGET_OS"
 echo "  backend             = $want_backend"
+echo "  use blst            = $use_blst"
 echo "  build bench         = $use_tests"
 echo "  build test          = $use_bench"
 echo "  use debug           = $use_debug"

depends/blst/CMakeLists.txt

@@ -0,0 +1,29 @@
+# Minimal CMake build for the vendored blst library (v0.3.16). blst ships its
+# own build.sh/build.bat, but the sources compile directly as a small static
+# library: one C translation unit (src/server.c, which #includes every other
+# .c file) plus the pre-generated per-platform assembly (build/assembly.S,
+# which #includes the correct flavour for the target OS/ABI).
+
+enable_language(ASM)
+
+add_library(blst STATIC
+  ${CMAKE_CURRENT_SOURCE_DIR}/src/server.c
+  ${CMAKE_CURRENT_SOURCE_DIR}/build/assembly.S
+)
+
+set_target_properties(blst PROPERTIES
+  C_STANDARD 99
+  POSITION_INDEPENDENT_CODE ON
+)
+
+# __BLST_PORTABLE__ compiles both the ADX and the generic x86_64 code paths
+# and selects between them at run time; it has no effect on aarch64. It must
+# be visible to both the C and the assembly translation unit.
+target_compile_definitions(blst PRIVATE __BLST_PORTABLE__)
+target_compile_options(blst PRIVATE
+  $<$<COMPILE_LANGUAGE:C>:-fno-builtin>
+)
+
+target_include_directories(blst
+  PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/bindings
+)

depends/blst/LICENSE

@@ -0,0 +1,201 @@
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