diff --git a/wolfcrypt/src/sp_int.c b/wolfcrypt/src/sp_int.c
index 271647c3c..53c70a19b 100644
--- a/wolfcrypt/src/sp_int.c
+++ b/wolfcrypt/src/sp_int.c
@@ -1022,10 +1022,31 @@ static WC_INLINE sp_int_digit sp_div_word(sp_int_digit hi, sp_int_digit lo,
                                           sp_int_digit d)
 {
     sp_int_digit r = 0;
+#if defined(WOLFSSL_SP_ARM_ARCH) && (WOLFSSL_SP_ARM_ARCH < 7)
+    static const char debruijn32[32] = {
+        0, 31, 9, 30, 3, 8, 13, 29, 2, 5, 7, 21, 12, 24, 28, 19,
+        1, 10, 4, 14, 6, 22, 25, 20, 11, 15, 23, 26, 16, 27, 17, 18
+    };
+    static const sp_uint32 debruijn32_mul = 0x076be629;
+#endif
 
     __asm__ __volatile__ (
         /* Shift d so that top bit is set. */
+#if defined(WOLFSSL_SP_ARM_ARCH) && (WOLFSSL_SP_ARM_ARCH < 7)
+        "ldr	r4, %[m]\n\t"
+        "mov	r5, %[d]\n\t"
+        "orr	r5, r5, r5, lsr #1\n\t"
+        "orr	r5, r5, r5, lsr #2\n\t"
+        "orr	r5, r5, r5, lsr #4\n\t"
+        "orr	r5, r5, r5, lsr #8\n\t"
+        "orr	r5, r5, r5, lsr #16\n\t"
+        "add	r5, r5, #1\n\t"
+        "mul	r5, r5, r4\n\t"
+        "lsr	r5, r5, #27\n\t"
+        "ldrb	r5, [%[t], r5]\n\t"
+#else
         "clz	r5, %[d]\n\t"
+#endif
         "rsb	r6, r5, #31\n\t"
         "lsl	%[d], %[d], r5\n\t"
         "lsl	%[hi], %[hi], r5\n\t"
@@ -1081,7 +1102,11 @@ static WC_INLINE sp_int_digit sp_div_word(sp_int_digit hi, sp_int_digit lo,
         "sbc	r8, r8, r8\n\t"
         "sub	%[r], %[r], r8\n\t"
         : [r] "+r" (r), [hi] "+r" (hi), [lo] "+r" (lo), [d] "+r" (d)
+#if defined(WOLFSSL_SP_ARM_ARCH) && (WOLFSSL_SP_ARM_ARCH < 7)
+        : [t] "r" (debruijn32), [m] "m" (debruijn32_mul)
+#else
         :
+#endif
         : "r4", "r5", "r6", "r8", "r9"
     );