add warning about dodgy inline assembly

17 years ago · a84c225e2f
parent d1aef8af83
commit a84c225e2f
2 changed files with 2 additions and 0 deletions
--- a/mult/imult64.c
+++ b/mult/imult64.c
@ -1,5 +1,6 @@
 #ifdef __x86_64__

+/* WARNING: this only works if compiled with -fomit-frame-pointer */
 void imult64() {
  asm volatile(
    "xchgq %rdx,%rsi\n"
--- a/mult/umult64.c
+++ b/mult/umult64.c
@ -1,5 +1,6 @@
 #ifdef __x86_64__

+/* WARNING: this only works if compiled with -fomit-frame-pointer */
 void umult64() {
  asm volatile(
    "xchgq %rdx,%rsi\n"