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Convert some undefined 1<<31 shifts into 1U<<31.

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According to ISO 9899:1999 S 6.5.7/4:

The result of E1 << E2 is E1 left-shifted E2 bit positions; vacated bits
are filled with zeros. If E1 has an unsigned type, the value of the
result is E1× 2^E2, reduced modulo one more than the maximum value
representable in the result type. If E1 has a signed type and
nonnegative value, and E1× 2^E2 is representable in the result type, then
that is the resulting value; otherwise, the behavior is undefined.
This commit is contained in:
Alex Converse 2011-04-09 17:22:04 -07:00 committed by Alex Converse
parent db46be01ec
commit 187a537904
5 changed files with 12 additions and 12 deletions
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12
libavcodec/aacdec.c
View File

@ -964,19 +964,19 @@ static inline float *VMUL4S(float *dst, const float *v, unsigned idx,
union float754 s = { .f = *scale };
union float754 t;
t.i = s.i ^ (sign & 1<<31);
t.i = s.i ^ (sign & 1U<<31);
*dst++ = v[idx & 3] * t.f;
sign <<= nz & 1; nz >>= 1;
t.i = s.i ^ (sign & 1<<31);
t.i = s.i ^ (sign & 1U<<31);
*dst++ = v[idx>>2 & 3] * t.f;
sign <<= nz & 1; nz >>= 1;
t.i = s.i ^ (sign & 1<<31);
t.i = s.i ^ (sign & 1U<<31);
*dst++ = v[idx>>4 & 3] * t.f;
sign <<= nz & 1; nz >>= 1;
t.i = s.i ^ (sign & 1<<31);
t.i = s.i ^ (sign & 1U<<31);
*dst++ = v[idx>>6 & 3] * t.f;
return dst;
@ -1169,11 +1169,11 @@ static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
b += 4;
n = (1 << b) + SHOW_UBITS(re, gb, b);
LAST_SKIP_BITS(re, gb, b);
*icf++ = cbrt_tab[n] | (bits & 1<<31);
*icf++ = cbrt_tab[n] | (bits & 1U<<31);
bits <<= 1;
} else {
unsigned v = ((const uint32_t*)vq)[cb_idx & 15];
*icf++ = (bits & 1<<31) | v;
*icf++ = (bits & 1U<<31) | v;
bits <<= !!v;
}
cb_idx >>= 4;

4
libavcodec/dsputil.c
View File

@ -3827,7 +3827,7 @@ static inline uint32_t clipf_c_one(uint32_t a, uint32_t mini,
{
if(a > mini) return mini;
else if((a^(1<<31)) > maxisign) return maxi;
else if((a^(1U<<31)) > maxisign) return maxi;
else return a;
}
@ -3835,7 +3835,7 @@ static void vector_clipf_c_opposite_sign(float *dst, const float *src, float *mi
int i;
uint32_t mini = *(uint32_t*)min;
uint32_t maxi = *(uint32_t*)max;
uint32_t maxisign = maxi ^ (1<<31);
uint32_t maxisign = maxi ^ (1U<<31);
uint32_t *dsti = (uint32_t*)dst;
const uint32_t *srci = (const uint32_t*)src;
for(i=0; i<len; i+=8) {

4
libavcodec/fraps.c
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@ -180,7 +180,7 @@ static int decode_frame(AVCodecContext *avctx,
return -1;
}
/* bit 31 means same as previous pic */
f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
f->pict_type = (header & (1U<<31))? FF_P_TYPE : FF_I_TYPE;
f->key_frame = f->pict_type == FF_I_TYPE;
if (f->pict_type == FF_I_TYPE) {
@ -223,7 +223,7 @@ static int decode_frame(AVCodecContext *avctx,
return -1;
}
/* bit 31 means same as previous pic */
f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
f->pict_type = (header & (1U<<31))? FF_P_TYPE : FF_I_TYPE;
f->key_frame = f->pict_type == FF_I_TYPE;
if (f->pict_type == FF_I_TYPE) {

2
libavcodec/ppc/fft_altivec.c
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@ -122,7 +122,7 @@ static void ff_imdct_calc_altivec(FFTContext *s, FFTSample *output, const FFTSam
int n = 1 << s->mdct_bits;
int n4 = n >> 2;
int n16 = n >> 4;
vec_u32 sign = {1<<31,1<<31,1<<31,1<<31};
vec_u32 sign = {1U<<31,1U<<31,1U<<31,1U<<31};
vec_u32 *p0 = (vec_u32*)(output+n4);
vec_u32 *p1 = (vec_u32*)(output+n4*3);

2
libavcodec/vorbis_enc.c
View File

@ -394,7 +394,7 @@ static void put_float(PutBitContext *pb, float f)
mant = (int)ldexp(frexp(f, &exp), 20);
exp += 788 - 20;
if (mant < 0) {
res |= (1 << 31);
res |= (1U << 31);
mant = -mant;
}
res |= mant | (exp << 21);