X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=blobdiff_plain;f=src%2Fsub_digits_asm.s;h=17d81c19eab4b8a6f69cbaf31d1a4c931fe35323;hp=1a6ee3b46d92e0c314bf809d4cab1e55d63f95e5;hb=85e08223a33439f9b4911129b48ee45ff65869eb;hpb=e4c05570709db2718a983c27322942769eab4c86

diff --git a/src/sub_digits_asm.s b/src/sub_digits_asm.s
index 1a6ee3b..17d81c1 100644
--- a/src/sub_digits_asm.s
+++ b/src/sub_digits_asm.s
@@ -9,6 +9,7 @@
 # Result in %rax is the final result in the carry flag
 # Exploits the fact that inc and dec do not affect the carry flag
 sub_digits:
+	subq $0, %rax		# Reset the carry/borrow flag
 	loop:
 		movq (%rsi), %rax # Temporarily store digit from second array
 		sbbq %rax, (%rdi) # Subtract digits in second and first array, store in first