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md5/sha512: fix strict aliasing warnings

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If the target can tolerate these issues, then gcc is smart enough
to generate the same code (x86_64 produces the same code).  If the
target can't, then it needs the memcpy anyways.

libbb/hash_md5_sha.c: In function 'common64_end':
libbb/hash_md5_sha.c:87:4: warning:
  dereferencing type-punned pointer will break strict-aliasing rules
    *(uint64_t *) (&ctx->wbuffer[64 - 8]) = t;
libbb/hash_md5_sha.c: In function 'sha512_end':
libbb/hash_md5_sha.c:886:4: warning:
  dereferencing type-punned pointer will break strict-aliasing rules
    *(uint64_t *) (&ctx->wbuffer[128 - 8]) = t;
libbb/hash_md5_sha.c:889:4: warning:
  dereferencing type-punned pointer will break strict-aliasing rules
    *(uint64_t *) (&ctx->wbuffer[128 - 16]) = t;

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2013-06-19 11:45:05 -04:00
parent fea2588021
commit f6205c6ab7
1 changed files with 3 additions and 3 deletions
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6
libbb/hash_md5_sha.c
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@ -84,7 +84,7 @@ static void FAST_FUNC common64_end(md5_ctx_t *ctx, int swap_needed)
if (swap_needed) if (swap_needed)
t = bb_bswap_64(t); t = bb_bswap_64(t);
/* wbuffer is suitably aligned for this */ /* wbuffer is suitably aligned for this */
*(uint64_t *) (&ctx->wbuffer[64 - 8]) = t; memcpy(&ctx->wbuffer[64 - 8], &t, sizeof(t));
} }
ctx->process_block(ctx); ctx->process_block(ctx);
if (remaining >= 8) if (remaining >= 8)
@ -883,10 +883,10 @@ void FAST_FUNC sha512_end(sha512_ctx_t *ctx, void *resbuf)
uint64_t t; uint64_t t;
t = ctx->total64[0] << 3; t = ctx->total64[0] << 3;
t = SWAP_BE64(t); t = SWAP_BE64(t);
*(uint64_t *) (&ctx->wbuffer[128 - 8]) = t; memcpy(&ctx->wbuffer[128 - 8], &t, sizeof(t));
t = (ctx->total64[1] << 3) | (ctx->total64[0] >> 61); t = (ctx->total64[1] << 3) | (ctx->total64[0] >> 61);
t = SWAP_BE64(t); t = SWAP_BE64(t);
*(uint64_t *) (&ctx->wbuffer[128 - 16]) = t; memcpy(&ctx->wbuffer[128 - 16], &t, sizeof(t));
} }
sha512_process_block128(ctx); sha512_process_block128(ctx);
if (remaining >= 16) if (remaining >= 16)