| commit | 2911e9b95f3bb03783ae5ca3e2494dc3b44a9161 | |
| author | Richard Henderson <richard.henderson@linaro.org> | |
| Tue, 26 Mar 2024 21:21:38 +0000 (26 11:21 -1000) | ||
| committer | Richard Henderson <richard.henderson@linaro.org> | |
| Fri, 29 Mar 2024 22:15:55 +0000 (29 12:15 -1000) | ||
| tree | c316e248a8843ced44d250823663f6f3f337ae60 | treesnapshot (tar.gz zip) |
| parent | 889cd5a8e2dd6cf8793faba22fda38b78553ae24 | commitdiff |
tcg/optimize: Fix sign_mask for logical right-shift
The 'sign' computation is attempting to locate the sign bit that has
been repeated, so that we can test if that bit is known zero. That
computation can be zero if there are no known sign repetitions.
Cc: qemu-stable@nongnu.org
Fixes: 93a967fbb57 ("tcg/optimize: Propagate sign info for shifting")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2248
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
The 'sign' computation is attempting to locate the sign bit that has
been repeated, so that we can test if that bit is known zero. That
computation can be zero if there are no known sign repetitions.
Cc: qemu-stable@nongnu.org
Fixes: 93a967fbb57 ("tcg/optimize: Propagate sign info for shifting")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2248
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
| tcg/optimize.c | diffblobblamehistory | |
| tests/tcg/aarch64/Makefile.target | diffblobblamehistory | |
| tests/tcg/aarch64/test-2248.c | [new file with mode: 0644] | blob |