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Communicate proper aliasing to gcc (needed for 4.1).

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Originally committed as revision 4384 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Falk Hüffner 2005-06-19 21:46:14 +00:00
parent 1a2f549126
commit 2fdf9cb2fb
2 changed files with 45 additions and 26 deletions
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32
libavcodec/alpha/asm.h
View File

@ -56,13 +56,33 @@ static inline uint64_t WORD_VEC(uint64_t x)
return x;
}
#define ldq(p) (*(const uint64_t *) (p))
#define ldl(p) (*(const int32_t *) (p))
#define stl(l, p) do { *(uint32_t *) (p) = (l); } while (0)
#define stq(l, p) do { *(uint64_t *) (p) = (l); } while (0)
#define sextw(x) ((int16_t) (x))
#ifdef __GNUC__
#define ldq(p) \
(((union { \
uint64_t __l; \
__typeof__(*(p)) __s[sizeof (uint64_t) / sizeof *(p)]; \
} *) (p))->__l)
#define ldl(p) \
(((union { \
int32_t __l; \
__typeof__(*(p)) __s[sizeof (int32_t) / sizeof *(p)]; \
} *) (p))->__l)
#define stq(l, p) \
do { \
(((union { \
uint64_t __l; \
__typeof__(*(p)) __s[sizeof (uint64_t) / sizeof *(p)]; \
} *) (p))->__l) = l; \
} while (0)
#define stl(l, p) \
do { \
(((union { \
int32_t __l; \
__typeof__(*(p)) __s[sizeof (int32_t) / sizeof *(p)]; \
} *) (p))->__l) = l; \
} while (0)
struct unaligned_long { uint64_t l; } __attribute__((packed));
#define ldq_u(p) (*(const uint64_t *) (((uint64_t) (p)) & ~7ul))
#define uldq(a) (((const struct unaligned_long *) (a))->l)
@ -132,6 +152,10 @@ struct unaligned_long { uint64_t l; } __attribute__((packed));
#elif defined(__DECC) /* Digital/Compaq/hp "ccc" compiler */
#include <c_asm.h>
#define ldq(p) (*(const uint64_t *) (p))
#define ldl(p) (*(const int32_t *) (p))
#define stq(l, p) do { *(uint64_t *) (p) = (l); } while (0)
#define stl(l, p) do { *(int32_t *) (p) = (l); } while (0)
#define ldq_u(a) asm ("ldq_u %v0,0(%a0)", a)
#define uldq(a) (*(const __unaligned uint64_t *) (a))
#define cmpbge(a, b) asm ("cmpbge %a0,%a1,%v0", a, b)

39
libavcodec/alpha/simple_idct_alpha.c
View File

@ -235,25 +235,22 @@ static inline void idct_col2(DCTELEM *col)
{
int i;
uint64_t l, r;
uint64_t *lcol = (uint64_t *) col;
for (i = 0; i < 8; ++i) {
int_fast32_t a0 = col[0] + (1 << (COL_SHIFT - 1)) / W4;
int_fast32_t a0 = col[i] + (1 << (COL_SHIFT - 1)) / W4;
a0 *= W4;
col[0] = a0 >> COL_SHIFT;
++col;
col[i] = a0 >> COL_SHIFT;
}
l = lcol[0];
r = lcol[1];
lcol[ 2] = l; lcol[ 3] = r;
lcol[ 4] = l; lcol[ 5] = r;
lcol[ 6] = l; lcol[ 7] = r;
lcol[ 8] = l; lcol[ 9] = r;
lcol[10] = l; lcol[11] = r;
lcol[12] = l; lcol[13] = r;
lcol[14] = l; lcol[15] = r;
l = ldq(col + 0 * 4); r = ldq(col + 1 * 4);
stq(l, col + 2 * 4); stq(r, col + 3 * 4);
stq(l, col + 4 * 4); stq(r, col + 5 * 4);
stq(l, col + 6 * 4); stq(r, col + 7 * 4);
stq(l, col + 8 * 4); stq(r, col + 9 * 4);
stq(l, col + 10 * 4); stq(r, col + 11 * 4);
stq(l, col + 12 * 4); stq(r, col + 13 * 4);
stq(l, col + 14 * 4); stq(r, col + 15 * 4);
}
void simple_idct_axp(DCTELEM *block)
@ -275,22 +272,20 @@ void simple_idct_axp(DCTELEM *block)
if (rowsZero) {
idct_col2(block);
} else if (rowsConstant) {
uint64_t *lblock = (uint64_t *) block;
idct_col(block);
for (i = 0; i < 8; i += 2) {
uint64_t v = (uint16_t) block[i * 8];
uint64_t w = (uint16_t) block[i * 8 + 8];
uint64_t v = (uint16_t) block[0];
uint64_t w = (uint16_t) block[8];
v |= v << 16;
w |= w << 16;
v |= v << 32;
w |= w << 32;
lblock[0] = v;
lblock[1] = v;
lblock[2] = w;
lblock[3] = w;
lblock += 4;
stq(v, block + 0 * 4);
stq(v, block + 1 * 4);
stq(w, block + 2 * 4);
stq(w, block + 3 * 4);
block += 4 * 4;
}
} else {
for (i = 0; i < 8; i++)