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target-m68k: Inline shifts

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Also manage word and byte operands and fix the computation of
overflow in the case of M68000 arithmetic shifts.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <1478699171-10637-4-git-send-email-rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-11-09 14:46:09 +01:00 • committed by Laurent Vivier
parent 72d2e4b6a4
commit 367790cce8
3 changed files with 202 additions and 81 deletions
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52
target/m68k/helper.c
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@ -284,58 +284,6 @@ void HELPER(set_sr)(CPUM68KState *env, uint32_t val)
m68k_switch_sp(env);
}
uint32_t HELPER(shl_cc)(CPUM68KState *env, uint32_t val, uint32_t shift)
{
uint64_t result;
shift &= 63;
result = (uint64_t)val << shift;
env->cc_c = (result >> 32) & 1;
env->cc_n = result;
env->cc_z = result;
env->cc_v = 0;
env->cc_x = shift ? env->cc_c : env->cc_x;
return result;
}
uint32_t HELPER(shr_cc)(CPUM68KState *env, uint32_t val, uint32_t shift)
{
uint64_t temp;
uint32_t result;
shift &= 63;
temp = (uint64_t)val << 32 >> shift;
result = temp >> 32;
env->cc_c = (temp >> 31) & 1;
env->cc_n = result;
env->cc_z = result;
env->cc_v = 0;
env->cc_x = shift ? env->cc_c : env->cc_x;
return result;
}
uint32_t HELPER(sar_cc)(CPUM68KState *env, uint32_t val, uint32_t shift)
{
uint64_t temp;
uint32_t result;
shift &= 63;
temp = (int64_t)val << 32 >> shift;
result = temp >> 32;
env->cc_c = (temp >> 31) & 1;
env->cc_n = result;
env->cc_z = result;
env->cc_v = result ^ val;
env->cc_x = shift ? env->cc_c : env->cc_x;
return result;
}
/* FPU helpers. */
uint32_t HELPER(f64_to_i32)(CPUM68KState *env, float64 val)
{