x64Emitter: add LZCNT/TZCNT support and detection

Also add a unit test.
2025-07-24 22:59:47 -06:00 · 2014-09-14 05:31:22 -07:00
parent 84a564a304
commit 997c5c2d0e
4 changed files with 51 additions and 36 deletions
--- a/Source/Core/Common/x64CPUDetect.cpp
+++ b/Source/Core/Common/x64CPUDetect.cpp
@ -197,6 +197,7 @@ void CPUInfo::Detect()
 		// Check for more features.
 		__cpuid(cpu_id, 0x80000001);
 		if (cpu_id[2] & 1) bLAHFSAHF64 = true;
+		if ((cpu_id[2] >> 5) & 1) bLZCNT = true;
 		if ((cpu_id[3] >> 29) & 1) bLongMode = true;
 	}