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JIT: more optimizing of float ops based on known input characteristics
If the inputs are both float singles, and the top half is known to be identical to the bottom half, we can use packed arithmetic instead of scalar to skip the movddup. This is slower on a few rather old CPUs, plus the Atom+Silvermont, so detect Atom and disable it in that case. Also avoid PPC_FP on stores if we know that the output came from a float op.
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9 changed files with 154 additions and 39 deletions
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@ -129,6 +129,12 @@ void CPUInfo::Detect()
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if (max_std_fn >= 1)
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{
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__cpuid(cpu_id, 0x00000001);
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int family = ((cpu_id[0] >> 8) & 0xf) + ((cpu_id[0] >> 20) & 0xff);
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int model = ((cpu_id[0] >> 4) & 0xf) + ((cpu_id[0] >> 12) & 0xf0);
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// Detect people unfortunate enough to be running Dolphin on an Atom
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if (family == 6 && (model == 0x1C || model == 0x26 ||model == 0x27 || model == 0x35 || model == 0x36 ||
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model == 0x37 || model == 0x4A || model == 0x4D || model == 0x5A || model == 0x5D))
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bAtom = true;
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logical_cpu_count = (cpu_id[1] >> 16) & 0xFF;
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ht = (cpu_id[3] >> 28) & 1;
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