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-rw-r--r--erts/emulator/beam/erl_bits.h2
-rw-r--r--erts/emulator/beam/sys.h4
-rw-r--r--erts/emulator/hipe/hipe_mode_switch.c3
3 files changed, 4 insertions, 5 deletions
diff --git a/erts/emulator/beam/erl_bits.h b/erts/emulator/beam/erl_bits.h
index b9d141d585..a3816fa820 100644
--- a/erts/emulator/beam/erl_bits.h
+++ b/erts/emulator/beam/erl_bits.h
@@ -111,7 +111,7 @@ typedef struct erl_bin_match_struct{
#define copy_binary_to_buffer(DstBuffer, DstBufOffset, SrcBuffer, SrcBufferOffset, NumBits) \
do { \
if (BIT_OFFSET(DstBufOffset) == 0 && (SrcBufferOffset == 0) && \
- (BIT_OFFSET(NumBits)==0)) { \
+ (BIT_OFFSET(NumBits)==0) && (NumBits != 0)) { \
sys_memcpy(DstBuffer+BYTE_OFFSET(DstBufOffset), \
SrcBuffer, NBYTES(NumBits)); \
} else { \
diff --git a/erts/emulator/beam/sys.h b/erts/emulator/beam/sys.h
index 152da8c9e1..c21acadd8d 100644
--- a/erts/emulator/beam/sys.h
+++ b/erts/emulator/beam/sys.h
@@ -1004,9 +1004,7 @@ erts_refc_read(erts_refc_t *refcp, erts_aint_t min_val)
* may seemingly work when the length (if any) is zero; a compiler can take
* this as a hint that the passed operand may *never* be NULL and then optimize
* based on that information.
- *
- * (The weird casts in the assertions silence an "always evaluates to true"
- * warning when an operand is the address of an lvalue) */
+ */
ERTS_GLB_INLINE void *sys_memcpy(void *dest, const void *src, size_t n);
ERTS_GLB_INLINE void *sys_memmove(void *dest, const void *src, size_t n);
ERTS_GLB_INLINE int sys_memcmp(const void *s1, const void *s2, size_t n);
diff --git a/erts/emulator/hipe/hipe_mode_switch.c b/erts/emulator/hipe/hipe_mode_switch.c
index 6af514d4ba..bc9a700204 100644
--- a/erts/emulator/hipe/hipe_mode_switch.c
+++ b/erts/emulator/hipe/hipe_mode_switch.c
@@ -664,7 +664,8 @@ void hipe_inc_nstack(Process *p)
Eterm *new_nstack = erts_alloc(ERTS_ALC_T_HIPE_STK, new_size*sizeof(Eterm));
unsigned used_size = p->hipe.nstend - p->hipe.nsp;
- sys_memcpy(new_nstack+new_size-used_size, p->hipe.nsp, used_size*sizeof(Eterm));
+ if (used_size)
+ sys_memcpy(new_nstack+new_size-used_size, p->hipe.nsp, used_size*sizeof(Eterm));
if (p->hipe.nstgraylim)
p->hipe.nstgraylim = new_nstack + new_size - (p->hipe.nstend - p->hipe.nstgraylim);
if (p->hipe.nstblacklim)