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target-sparc: Don't compute full flags value so often

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Avoid speculatively computing flags before every potentially trapping
operation and instead do the flags computation when a trap actually
occurs.  This gives approximately 30% speedup in emulation.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Richard Henderson 2012-10-09 14:50:00 -07:00 • committed by Blue Swirl
parent 6234ac09a9
commit 20132b9605
4 changed files with 26 additions and 19 deletions
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5
target-sparc/int32_helper.c
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@ -62,6 +62,11 @@ void do_interrupt(CPUSPARCState *env)
{
int cwp, intno = env->exception_index;
/* Compute PSR before exposing state. */
if (env->cc_op != CC_OP_FLAGS) {
cpu_get_psr(env);
}
#ifdef DEBUG_PCALL
if (qemu_loglevel_mask(CPU_LOG_INT)) {
static int count;