Commit 7fe21291 authored Jan 14, 2015 by Rasmus Villemoes Committed by David Howells Jan 14, 2015

MPILIB: Deobfuscate mpi_cmp



The condition preceding 'return 1;' makes my head hurt. At this point,
we know that u and v have the same sign; if they are negative, they
compare opposite to how their absolute values compare (which
mpihelp_cmp found for us), otherwise cmp itself is the
answer. Negating cmp is ok since mpihelp_cmp returns {-1,0,1};
-INT_MIN==INT_MIN won't bite us.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>

parent b2d1965d

lib/mpi/mpi-cmp.c

+3 −5

Original line number	Diff line number	Diff line
		@@ -61,10 +61,8 @@ int mpi_cmp(MPI u, MPI v)
		if (!usize)
		return 0;
		cmp = mpihelp_cmp(u->d, v->d, usize);
		if (!cmp)
		return 0;
		if ((cmp < 0 ? 1 : 0) == (u->sign ? 1 : 0))
		return 1;
		return -1;
		if (u->sign)
		return -cmp;
		return cmp;
		}
		EXPORT_SYMBOL_GPL(mpi_cmp);