The compiler can generate smulbb perfectly well nowadays.

include/core/SkPreConfig.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // IWYU pragma: private, include "SkTypes.h"
 
 #ifndef SkPreConfig_DEFINED
@@ skipping 154 matching lines @@
             #define SK_ARM_ARCH 6
         #elif defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \
                 || defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \
                 || defined(__ARM_ARCH_5TEJ__) || defined(_ARM_ARCH_5)
             #define SK_ARM_ARCH 5
         #elif defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) || defined(_ARM_ARCH_4)
             #define SK_ARM_ARCH 4
         #else
             #define SK_ARM_ARCH 3
         #endif
-
-        #if defined(__thumb2__) && (SK_ARM_ARCH >= 6) \
-                || !defined(__thumb__) && ((SK_ARM_ARCH > 5) || defined(__ARM_ARCH_5E__) \
-                || defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_5TEJ__))
-            #define SK_ARM_HAS_EDSP
-        #endif
     #endif
 #endif
 
 // Disable ARM64 optimizations for iOS due to complications regarding gyp and iOS.
 #if defined(__aarch64__) && !defined(SK_BUILD_FOR_IOS)
     #define SK_CPU_ARM64
 #endif
 
 // All 64-bit ARM chips have NEON.  Many 32-bit ARM chips do too.
 // TODO: Why don't we want NEON on iOS?
@@ skipping 59 matching lines @@
  *
  * NOTE: Clang/ARM (r161757) does not support the 'optimize' attribute.
  */
 #if SK_HAS_ATTRIBUTE(optimize)
 #   define SK_ATTRIBUTE_OPTIMIZE_O1 __attribute__((optimize("O1")))
 #else
 #   define SK_ATTRIBUTE_OPTIMIZE_O1 /* nothing */
 #endif
 
 #endif