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qemu-tech: document lazy condition code evaluation in cpu.h

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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>
This commit is contained in:
Paolo Bonzini 2016-10-06 15:10:57 +02:00
parent bf28a69eeb
commit c3ce5a2357
6 changed files with 34 additions and 25 deletions
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5
target-sparc/cpu.h
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@ -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 */