diff options
Diffstat (limited to 'results/classifier/gemma3:12b/assembly/2413')
| -rw-r--r-- | results/classifier/gemma3:12b/assembly/2413 | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/results/classifier/gemma3:12b/assembly/2413 b/results/classifier/gemma3:12b/assembly/2413 new file mode 100644 index 000000000..97b903ce9 --- /dev/null +++ b/results/classifier/gemma3:12b/assembly/2413 @@ -0,0 +1,34 @@ + +Use of TSTEQ/TSTNE has regressed the cdrom test when running a 32 bit build of qemu-system-x86_64 using TCG +Description of problem: +The test freezes, eventually timing out. The bisect was confused by other SEV related things so I had to whittle down the config to --disable-kvm. +Steps to reproduce: +1. '../../configure' '--disable-docs' '--disable-user' '--cross-prefix=i686-linux-gnu-' '--target-list=x86_64-softmmu' '--enable-debug' '--disable-kvm' +2. ninja +3. meson test -t 0.05 qtest-x86_64/cdrom-test V=1 +Additional information: +Bisect run pointed at: + +``` +commit 15957eb9efe2da67c796612cead95cba28ba9bda +Author: Paolo Bonzini <pbonzini@redhat.com> +Date: Fri Oct 27 05:57:31 2023 +0200 + + target/i386: use TSTEQ/TSTNE to test low bits + + When testing the sign bit or equality to zero of a partial register, it + is useful to use a single TSTEQ or TSTNE operation. It can also be used + to test the parity flag, using bit 0 of the population count. + + Do not do this for target_ulong-sized values however; the optimizer would + produce a comparison against zero anyway, and it avoids shifts by 64 + which are undefined behavior. + + Reviewed-by: Richard Henderson <richard.henderson@linaro.org> + Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> + + target/i386/tcg/translate.c | 28 ++++++++++++++++++++-------- + target/i386/tcg/emit.c.inc | 5 ++--- + 2 files changed, 22 insertions(+), 11 deletions(-) +bisect found first bad commitâ +``` |