diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2025-04-03 23:07:20 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2025-05-12 17:48:32 +0200 |
| commit | 5b80dcf95b9a196c15c12b0226f93732c1b1a843 (patch) | |
| tree | ffc5e6d02ff0b5bba1ccdf16ff2652184e2547a6 /scripts/vmstate-static-checker.py | |
| parent | 77a2dba45cc9a1be7fec6ab88f43d2fa18af52a3 (diff) | |
| download | qemu-5b80dcf95b9a196c15c12b0226f93732c1b1a843.zip qemu-5b80dcf95b9a196c15c12b0226f93732c1b1a843.tar.gz qemu-5b80dcf95b9a196c15c12b0226f93732c1b1a843.tar.bz2 | |
target/i386/emulate: mostly rewrite flags handling
While Bochs's algorithms are pretty solid, there are small opportunities
to improve them or to make their logic more similar to TCG's handling
of condition codes.
- use a single bit for the difference between bits 0..7 of result and PF.
This is useful because "set only ZF" is not a common case.
- place SD in the same place as SF
- move CF and PO at bits 62 and 63 when target_ulong is 64-bits wide,
so that 64-bit ALU operations need fewer shifts
- use rotates to move CF and AF from auxbits to their eflags position
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'scripts/vmstate-static-checker.py')
0 files changed, 0 insertions, 0 deletions