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Makes silk_ADD_SAT32() conform to the C standard

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This changes the saturation test to ensure that it relies on the
unsigned overflow behaviour (which is allowed) rather than the signed
overflow behaviour (which is undefined).
This commit is contained in:
Jean-Marc Valin 2012-04-12 16:35:19 -04:00
parent 367c394866
commit 94a4989cdb
2 changed files with 4 additions and 4 deletions
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4
silk/MacroDebug.h
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@ -98,7 +98,7 @@ static inline opus_int16 silk_ADD_SAT16( opus_int16 a16, opus_int16 b16 ) {
#undef silk_ADD_SAT32
static inline opus_int32 silk_ADD_SAT32(opus_int32 a32, opus_int32 b32){
opus_int32 res;
res = ((((a32) + (b32)) & 0x80000000) == 0 ? \
res = ((((opus_uint32)(a32) + (opus_uint32)(b32)) & 0x80000000) == 0 ? \
((((a32) & (b32)) & 0x80000000) != 0 ? silk_int32_MIN : (a32)+(b32)) : \
((((a32) | (b32)) & 0x80000000) == 0 ? silk_int32_MAX : (a32)+(b32)) );
silk_assert( res == silk_SAT32( (opus_int64)a32 + (opus_int64)b32 ) );
@ -133,7 +133,7 @@ static inline opus_int16 silk_SUB_SAT16( opus_int16 a16, opus_int16 b16 ) {
#undef silk_SUB_SAT32
static inline opus_int32 silk_SUB_SAT32( opus_int32 a32, opus_int32 b32 ) {
opus_int32 res;
res = ((((a32)-(b32)) & 0x80000000) == 0 ? \
res = ((((opus_uint32)(a32)-(opus_uint32)(b32)) & 0x80000000) == 0 ? \
(( (a32) & ((b32)^0x80000000) & 0x80000000) ? silk_int32_MIN : (a32)-(b32)) : \
((((a32)^0x80000000) & (b32) & 0x80000000) ? silk_int32_MAX : (a32)-(b32)) );
silk_assert( res == silk_SAT32( (opus_int64)a32 - (opus_int64)b32 ) );

4
silk/macros.h
View file

@ -68,11 +68,11 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#define silk_SMLAWW(a32, b32, c32) silk_MLA(silk_SMLAWB((a32), (b32), (c32)), (b32), silk_RSHIFT_ROUND((c32), 16))
/* add/subtract with output saturated */
#define silk_ADD_SAT32(a, b) ((((a) + (b)) & 0x80000000) == 0 ? \
#define silk_ADD_SAT32(a, b) ((((opus_uint32)(a) + (opus_uint32)(b)) & 0x80000000) == 0 ? \
((((a) & (b)) & 0x80000000) != 0 ? silk_int32_MIN : (a)+(b)) : \
((((a) | (b)) & 0x80000000) == 0 ? silk_int32_MAX : (a)+(b)) )
#define silk_SUB_SAT32(a, b) ((((a)-(b)) & 0x80000000) == 0 ? \
#define silk_SUB_SAT32(a, b) ((((opus_uint32)(a)-(opus_uint32)(b)) & 0x80000000) == 0 ? \
(( (a) & ((b)^0x80000000) & 0x80000000) ? silk_int32_MIN : (a)-(b)) : \
((((a)^0x80000000) & (b) & 0x80000000) ? silk_int32_MAX : (a)-(b)) )