diff --git a/include/fast_float/ascii_number.h b/include/fast_float/ascii_number.h
index c281be4..22c6720 100644
--- a/include/fast_float/ascii_number.h
+++ b/include/fast_float/ascii_number.h
@@ -74,7 +74,7 @@ read8_to_u64(UC const *chars) {
 
 fastfloat_really_inline uint64_t simd_read8_to_u64(__m128i const &data) {
   FASTFLOAT_SIMD_DISABLE_WARNINGS
-  // _mm_packus_epi16 is SSE4.1+, converts 8×u16 → 8×u8
+  // _mm_packus_epi16 is SSE2+, converts 8×u16 → 8×u8
   __m128i const packed = _mm_packus_epi16(data, data);
 #ifdef FASTFLOAT_SSE42
   return static_cast<uint64_t>(_mm_cvtsi128_si64(packed));
@@ -171,13 +171,10 @@ simd_parse_if_eight_digits_unrolled(char16_t const *chars,
 
 #ifdef FASTFLOAT_SSE42
   // --- Digit range check using SSE4.2 comparisons ---
-  // Validate: '0' (0x30) ≤ x ≤ '9' (0x39)
-  const __m128i ascii0 = _mm_set1_epi16(u'0');
-  const __m128i ascii9 = _mm_set1_epi16(u'9');
-
-  __m128i below0 = _mm_cmplt_epi16(data, ascii0);   // x < '0'
-  __m128i above9 = _mm_cmpgt_epi16(data, ascii9);   // x > '9'
-  __m128i invalid = _mm_or_si128(below0, above9);
+  // Validate: '0' (0x0030) ≤ x ≤ '9' (0x0039)
+  __m128i const below0 = _mm_cmplt_epi16(data, _mm_set1_epi16(u'0')); // x < '0'
+  __m128i const above9 = _mm_cmpgt_epi16(data, _mm_set1_epi16(u'9')); // x > '9'
+  __m128i const invalid = _mm_or_si128(below0, above9);
 
   // Check if any invalid byte exists
   if (_mm_testz_si128(invalid, invalid)) { // SSE4.1/4.2: zero flag test
@@ -186,18 +183,16 @@ simd_parse_if_eight_digits_unrolled(char16_t const *chars,
   // (x - '0') <= 9  <=> (x + 32720) <= 32729
   // encoded as signed comparison: (x + 32720) > -32759 ? not digit : digit
   // http://0x80.pl/articles/simd-parsing-int-sequences.html
-  __m128i const adjust = _mm_set1_epi16(32720);
-  __m128i const cutoff = _mm_set1_epi16(-32759);
-  __m128i const t0 = _mm_add_epi16(data, adjust);
-  __m128i const mask = _mm_cmpgt_epi16(t0, cutoff);
+  __m128i const t0 = _mm_add_epi16(data, _mm_set1_epi16(32720));
+  __m128i const mask = _mm_cmpgt_epi16(t0, _mm_set1_epi16(-32759));
 
   // If mask == 0 → all digits valid.
   if (_mm_movemask_epi8(mask) == 0) {
+#endif
     i = i * 100000000 + parse_eight_digits_unrolled(simd_read8_to_u64(data));
     return true;
   } else
     return false;
-#endif
   FASTFLOAT_SIMD_RESTORE_WARNINGS
 #elif defined(FASTFLOAT_NEON)
   FASTFLOAT_SIMD_DISABLE_WARNINGS
@@ -218,10 +213,10 @@ simd_parse_if_eight_digits_unrolled(char16_t const *chars,
   (void)chars;
   (void)i;
   return false;
-#endif // FASTFLOAT_SSE2
+#endif
 }
 
-#endif // FASTFLOAT_HAS_SIMD
+#endif
 
 // MSVC SFINAE is broken pre-VS2017
 #if defined(_MSC_VER) && _MSC_VER <= 1900