Commit f6c98f91 authored Nov 06, 2018 by Peter Maydell

target/arm: Remove can't-happen if() from handle_vec_simd_shli()



In handle_vec_simd_shli() we have a check:
     if (size > 3 && !is_q) {
         unallocated_encoding(s);
         return;
     }
However this can never be true, because we calculate
    int size = 32 - clz32(immh) - 1;
where immh is a 4 bit field which we know cannot be all-zeroes.
So the clz32() return must be in {28,29,30,31} and the resulting
size is in {0,1,2,3}, and "size > 3" is never true.

This unnecessary code confuses Coverity's analysis:
in CID 1396476 it thinks we might later index off the
end of an array because the condition implies that we
might have a size > 3.

Remove the code, and instead assert that the size is in [0..3],
since the decode that enforces that is somewhat distant from
this function.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20181030162517.21816-1-peter.maydell@linaro.org

parent 03c1ca1c

target/arm/translate-a64.c

+3 −5

Original line number	Diff line number	Diff line
		@@ -9483,12 +9483,10 @@ static void handle_vec_simd_shli(DisasContext *s, bool is_q, bool insert,
		int immhb = immh << 3 \| immb;
		int shift = immhb - (8 << size);

		if (extract32(immh, 3, 1) && !is_q) {
		unallocated_encoding(s);
		return;
		}
		/* Range of size is limited by decode: immh is a non-zero 4 bit field */
		assert(size >= 0 && size <= 3);

		if (size > 3 && !is_q) {
		if (extract32(immh, 3, 1) && !is_q) {
		unallocated_encoding(s);
		return;
		}