tree 9f133af75426149336883da050848c4024ef2928
parent 58d7d18b5268febb8b1391c6dffc8e2aaa751fcd
author Herbert Xu <herbert@gondor.apana.org.au> 1328414968 +1100
committer Herbert Xu <herbert@gondor.apana.org.au> 1328414968 +1100

crypto: sha512 - Avoid stack bloat on i386

Unfortunately in reducing W from 80 to 16 we ended up unrolling
the loop twice.  As gcc has issues dealing with 64-bit ops on
i386 this means that we end up using even more stack space (>1K).

This patch solves the W reduction by moving LOAD_OP/BLEND_OP
into the loop itself, thus avoiding the need to duplicate it.

While the stack space still isn't great (>0.5K) it is at least
in the same ball park as the amount of stack used for our C sha1
implementation.

Note that this patch basically reverts to the original code so
the diff looks bigger than it really is.

Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>