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| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-10-06 15:10:57 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-10-07 10:05:22 +0200 |
| commit | c3ce5a235741cb027b1328288ddec06470254813 (patch) | |
| tree | 18b91ded381a74e17158c282dea2047b0ae3c3e6 /target-sparc | |
| parent | bf28a69eeb53e9e45166fbdda032454e7b1e3f29 (diff) | |
qemu-tech: document lazy condition code evaluation in cpu.h
Unlike the other sections, they are pretty specific to a particular CPU.
Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'target-sparc')
| -rw-r--r-- | target-sparc/cpu.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/target-sparc/cpu.h b/target-sparc/cpu.h index a3d64a4e52..646a103513 100644 --- a/target-sparc/cpu.h +++ b/target-sparc/cpu.h @@ -102,6 +102,11 @@ #define CC_DST (env->cc_dst) #define CC_OP (env->cc_op) +/* Even though lazy evaluation of CPU condition codes tends to be less + * important on RISC systems where condition codes are only updated + * when explicitly requested, SPARC uses it to update 32-bit and 64-bit + * condition codes. + */ enum { CC_OP_DYNAMIC, /* must use dynamic code to get cc_op */ CC_OP_FLAGS, /* all cc are back in status register */ |