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ppc: fix Altivec build with old compilers

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The vec_splat() intrinsic requires a constant argument for the
element number, and the code relies on the compiler unrolling
the loop to provide this.  Manually unrolling the loop avoids
this reliance and works with all compilers.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-10-08 23:01:02 +01:00
parent 643933f51d
commit f79364b2c3
1 changed files with 14 additions and 5 deletions
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19
libavcodec/ppc/fmtconvert_altivec.c
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@ -83,6 +83,12 @@ static void float_to_int16_altivec(int16_t *dst, const float *src, long len)
}
}
#define VSTE_INC(dst, v, elem, inc) do { \
vector signed short s = vec_splat(v, elem); \
vec_ste(s, 0, dst); \
dst += inc; \
} while (0)
static void float_to_int16_stride_altivec(int16_t *dst, const float *src,
long len, int stride)
{
@ -91,11 +97,14 @@ static void float_to_int16_stride_altivec(int16_t *dst, const float *src,
for (i = 0; i < len - 7; i += 8) {
d = float_to_int16_one_altivec(src + i);
for (j = 0; j < 8; j++) {
s = vec_splat(d, j);
vec_ste(s, 0, dst);
dst += stride;
}
VSTE_INC(dst, d, 0, stride);
VSTE_INC(dst, d, 1, stride);
VSTE_INC(dst, d, 2, stride);
VSTE_INC(dst, d, 3, stride);
VSTE_INC(dst, d, 4, stride);
VSTE_INC(dst, d, 5, stride);
VSTE_INC(dst, d, 6, stride);
VSTE_INC(dst, d, 7, stride);
}
}