diff --git a/src/mont/fp_montgomery_reduce.c b/src/mont/fp_montgomery_reduce.c
index 4339252..ad074f9 100644
--- a/src/mont/fp_montgomery_reduce.c
+++ b/src/mont/fp_montgomery_reduce.c
@@ -325,22 +325,18 @@ asm(                               \
 asm(                                 \
    " mullw    16,%3,%4       \n\t"   \
    " mulhwu   17,%3,%4       \n\t"   \
-   " addc     16,16,%0       \n\t"   \
+   " addc     16,16,%2       \n\t"   \
    " addze    17,17          \n\t"   \
-   " lwz      18,%1          \n\t"   \
-   " addc     16,16,18       \n\t"   \
+   " addc     %1,16,%5       \n\t"   \
    " addze    %0,17          \n\t"   \
-   " stw      16,%1          \n\t"   \
-:"=r"(cy),"=g"(_c[0]):"0"(cy),"r"(mu),"r"(tmpm[0]),"1"(_c[0]):"16", "17", "18","cc"); ++tmpm;
+:"=r"(cy),"=r"(_c[0]):"0"(cy),"r"(mu),"r"(tmpm[0]),"1"(_c[0]):"16", "17", "cc"); ++tmpm;
 
 #define PROPCARRY                    \
 asm(                                 \
-   " lwz      16,%1         \n\t"    \
-   " addc     16,16,%0      \n\t"    \
-   " stw      16,%1         \n\t"    \
-   " xor      %0,%0,%0      \n\t"    \
-   " addze    %0,%0         \n\t"    \
-:"=r"(cy),"=g"(_c[0]):"0"(cy),"1"(_c[0]):"16","cc");
+   " addc     %1,%3,%2      \n\t"    \
+   " xor      %0,%2,%2      \n\t"    \
+   " addze    %0,%2         \n\t"    \
+:"=r"(cy),"=r"(_c[0]):"0"(cy),"1"(_c[0]):"cc");
 
 /******************************************************************/
 #elif defined(TFM_PPC64)