faster_bc_convert.patch

diff --git a/ext/bcmath/libbcmath/src/str2num.c b/ext/bcmath/libbcmath/src/str2num.c
index 1e91840ab9f..59abeeffcaa 100644
--- a/ext/bcmath/libbcmath/src/str2num.c
+++ b/ext/bcmath/libbcmath/src/str2num.c
@@ -35,6 +35,32 @@
 
 /* Convert strings to bc numbers.  Base 10 only.*/
 
+#define SWAR_ONES (~((size_t) 0) / 0xFF)
+#define SWAR_REPEAT(x) (SWAR_ONES * (x))
+
+static char *bc_copy_number_values(char *dest, const char *source, const char *source_end)
+{
+	while (source + sizeof(size_t) <= source_end) {
+		size_t bytes;
+		memcpy(&bytes, source, sizeof(bytes));
+
+		size_t mask = SWAR_REPEAT('0');
+		bytes -= mask;
+		memcpy(dest, &bytes, sizeof(bytes));
+
+		source += sizeof(size_t);
+		dest += sizeof(size_t);
+	}
+
+	while (source < source_end) {
+		*dest = CH_VAL(*source);
+		dest++;
+		source++;
+	}
+
+	return dest;
+}
+
 bool bc_str2num(bc_num *num, char *str, size_t scale)
 {
 	size_t digits = 0;
@@ -109,25 +135,13 @@ bool bc_str2num(bc_num *num, char *str, size_t scale)
 	if (zero_int) {
 		nptr++;
 		if (str_scale > 0) {
-			while (fractional_ptr < fractional_end) {
-				*nptr = CH_VAL(*fractional_ptr);
-				nptr++;
-				fractional_ptr++;
-			}
+			nptr = bc_copy_number_values(nptr, fractional_ptr, fractional_end);
 		}
 	} else {
-		integer_end = integer_ptr + digits - 1;
-		while (integer_ptr <= integer_end) {
-			*nptr = CH_VAL(*integer_ptr);
-			nptr++;
-			integer_ptr++;
-		}
+		integer_end = integer_ptr + digits;
+		nptr = bc_copy_number_values(nptr, integer_ptr, integer_end);
 		if (str_scale > 0) {
-			while (fractional_ptr < fractional_end) {
-				*nptr = CH_VAL(*fractional_ptr);
-				nptr++;
-				fractional_ptr++;
-			}
+			nptr = bc_copy_number_values(nptr, fractional_ptr, fractional_end);
 		}
 	}