| commit | d3a77b42decd0cbfa62a5526e67d1d6d380c83a9 | |
| author | Richard Henderson <rth@twiddle.net> | |
| Mon, 14 Sep 2015 13:39:48 +0000 (14 14:39 +0100) | ||
| committer | Peter Maydell <peter.maydell@linaro.org> | |
| Mon, 14 Sep 2015 13:39:48 +0000 (14 14:39 +0100) | ||
| tree | 8843bb7b57d6377659e9426aeebee10cc6ce94dd | treesnapshot (tar.gz zip) |
| parent | 9924e85829fe21b5f38a5d267c9aea44c5d478ac | commitdiff |
target-arm: Eliminate unnecessary zero-extend in disas_bitfield
For !SF, this initial ext32u can't be optimized away by the
current TCG code generator. (It would require backward bit
liveness propagation.)
But since the range of bits for !SF are already constrained by
unallocated_encoding, we'll never reference the high bits anyway.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-id: 1441909103-24666-10-git-send-email-rth@twiddle.net
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
For !SF, this initial ext32u can't be optimized away by the
current TCG code generator. (It would require backward bit
liveness propagation.)
But since the range of bits for !SF are already constrained by
unallocated_encoding, we'll never reference the high bits anyway.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-id: 1441909103-24666-10-git-send-email-rth@twiddle.net
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| target-arm/translate-a64.c | diffblobblamehistory |