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microblaze: Improve addkc

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* Optimize handling when carry is not updated.
* Optimize handling for adds with nop semantics.
* Move code from helper_addkc to the translator making
  helper_addkc PURE and CONST.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
This commit is contained in:
Edgar E. Iglesias 2011-01-22 12:02:53 +01:00
parent 2accfb5fa6
commit 40cbf5b709
3 changed files with 46 additions and 27 deletions
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20
target-microblaze/op_helper.c
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@ -128,26 +128,14 @@ uint32_t helper_cmpu(uint32_t a, uint32_t b)
return t;
}
uint32_t helper_addkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c)
uint32_t helper_addkc(uint32_t a, uint32_t b, uint32_t cf)
{
uint32_t d, cf = 0, ncf;
uint32_t d, ncf;
if (c)
cf = env->sregs[SR_MSR] >> 31;
assert(cf == 0 || cf == 1);
d = a + b + cf;
if (!k) {
ncf = compute_carry(a, b, cf);
assert(ncf == 0 || ncf == 1);
if (ncf)
env->sregs[SR_MSR] |= MSR_C | MSR_CC;
else
env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC);
}
D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n",
d, a, b, cf, ncf, k, c));
return d;
ncf = compute_carry(a, b, cf);
return ncf;
}
uint32_t helper_subkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c)