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avcodec/ppc/h264dsp: Fix unaligned stores

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Also fix an effective-type violation.
Exposed by https://fate.ffmpeg.org/report.cgi?time=20240312011016&slot=ppc-linux-gcc-13.2-ubsan-altivec-qemu

Tested-by: Sean McGovern <gseanmcg@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
release/7.0
Andreas Rheinhardt 1 year ago
parent f032f1326b
commit f9aa5457ff
1 changed files with 17 additions and 18 deletions
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  1. 35
      libavcodec/ppc/h264dsp.c

35
libavcodec/ppc/h264dsp.c
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@ -401,30 +401,29 @@ static inline void write16x4(uint8_t *dst, int dst_stride,
register vec_u8 r0, register vec_u8 r1,
register vec_u8 r2, register vec_u8 r3) {
DECLARE_ALIGNED(16, unsigned char, result)[64];
uint32_t *src_int = (uint32_t *)result, *dst_int = (uint32_t *)dst;
int int_dst_stride = dst_stride/4;
uint32_t *src_int = (uint32_t *)result;
vec_st(r0, 0, result);
vec_st(r1, 16, result);
vec_st(r2, 32, result);
vec_st(r3, 48, result);
/* FIXME: there has to be a better way!!!! */
*dst_int = *src_int;
*(dst_int+ int_dst_stride) = *(src_int + 1);
*(dst_int+ 2*int_dst_stride) = *(src_int + 2);
*(dst_int+ 3*int_dst_stride) = *(src_int + 3);
*(dst_int+ 4*int_dst_stride) = *(src_int + 4);
*(dst_int+ 5*int_dst_stride) = *(src_int + 5);
*(dst_int+ 6*int_dst_stride) = *(src_int + 6);
*(dst_int+ 7*int_dst_stride) = *(src_int + 7);
*(dst_int+ 8*int_dst_stride) = *(src_int + 8);
*(dst_int+ 9*int_dst_stride) = *(src_int + 9);
*(dst_int+10*int_dst_stride) = *(src_int + 10);
*(dst_int+11*int_dst_stride) = *(src_int + 11);
*(dst_int+12*int_dst_stride) = *(src_int + 12);
*(dst_int+13*int_dst_stride) = *(src_int + 13);
*(dst_int+14*int_dst_stride) = *(src_int + 14);
*(dst_int+15*int_dst_stride) = *(src_int + 15);
AV_WN32(dst, AV_RN32A(src_int + 0));
AV_WN32(dst + dst_stride, AV_RN32A(src_int + 1));
AV_WN32(dst + 2 * dst_stride, AV_RN32A(src_int + 2));
AV_WN32(dst + 3 * dst_stride, AV_RN32A(src_int + 3));
AV_WN32(dst + 4 * dst_stride, AV_RN32A(src_int + 4));
AV_WN32(dst + 5 * dst_stride, AV_RN32A(src_int + 5));
AV_WN32(dst + 6 * dst_stride, AV_RN32A(src_int + 6));
AV_WN32(dst + 7 * dst_stride, AV_RN32A(src_int + 7));
AV_WN32(dst + 8 * dst_stride, AV_RN32A(src_int + 8));
AV_WN32(dst + 9 * dst_stride, AV_RN32A(src_int + 9));
AV_WN32(dst + 10 * dst_stride, AV_RN32A(src_int + 10));
AV_WN32(dst + 11 * dst_stride, AV_RN32A(src_int + 11));
AV_WN32(dst + 12 * dst_stride, AV_RN32A(src_int + 12));
AV_WN32(dst + 13 * dst_stride, AV_RN32A(src_int + 13));
AV_WN32(dst + 14 * dst_stride, AV_RN32A(src_int + 14));
AV_WN32(dst + 15 * dst_stride, AV_RN32A(src_int + 15));
}
/** @brief performs a 6x16 transpose of data in src, and stores it to dst

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