libzahl

commit 6b97020bdbdc5eb08aaa638d0649013ce9c65188
parent 26515c8f58f30e9ec99e16e3054913ff89ae742b
Author: Mattias Andrée <maandree@kth.se>
Date:   Fri, 10 Jun 2016 13:35:41 +0200

Add a comment about storing the carry flag

Signed-off-by: Mattias Andrée <maandree@kth.se>

Diffstat:
M
src/zadd.c
 | 
5
+++++

1 file changed, 5 insertions(+), 0 deletions(-)
diff --git a/src/zadd.c b/src/zadd.c
@@ -25,6 +25,11 @@
 	"\n    jc 1f"           \
 	"\n    movq $0, %[x]"   \
 	"\n 1:"
+/*
+ * I have already tried setc, cmovnc, cmovc, and adc,
+ * instead of the last four lines. There does not seem
+ * to be any better why to store the carry flag.
+ */
 
 # define ASM_ADD(N)                                                                          \
 	do {                                                                                 \