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https://github.com/FEX-Emu/FEX.git
synced 2026-10-06 15:00:17 +02:00
Ryan Houdek
1f554867e0
Fixes #4124 clang feature checking can't check beyond MIDR, so compiling for a specific cortex version means compiling SVE on these CPUs that disabled them. Just detect the particular situation in-which SVE isn't inside proc/cpuinfo and is one of the snapdragon cores that are supposed to support SVE. Then compile for Cortex-a78 instead.
74 lines
2.0 KiB
Python
Executable File
74 lines
2.0 KiB
Python
Executable File
#!/usr/bin/python3
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# Qualcomm in their infinite wisdom decided to disable SVE in a handful of SoCs.
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# When compiling for a specific CPU architecture or `-mcpu=native`, we need to ensure
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# that SVE is disabled on these platforms that had the feature disabled.
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# Check for the handful of Cortex CPUs that support SVE in hardware, but are disabled
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# in software.
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import re
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import sys
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def GetCPUFeatures():
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File = open("/proc/cpuinfo", "r")
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Lines = File.readlines()
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File.close()
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for Line in Lines:
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if "Features" in Line:
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Features = Line.split(":")[1].strip().split(" ")
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return Features
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SnapdragonIDsWithDisabledSVE = {
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# Snapdragon 8 Gen 3
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tuple([0x41, 0xd82]): True, # Cortex-X4
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tuple([0x41, 0xd81]): True, # Cortex-A720
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tuple([0x41, 0xd80]): True, # Cortex-A520
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# Snapdragon 8 Gen 2
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tuple([0x41, 0xd4e]): True, # Cortex-X3
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tuple([0x41, 0xd4d]): True, # Cortex-A715
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tuple([0x41, 0xd47]): True, # Cortex-A710
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tuple([0x41, 0xd46]): True, # Cortex-A510
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# Snapdragon 8 Gen 1
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tuple([0x41, 0xd48]): True, # Cortex-X2
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# A710
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# A510
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}
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def IsAffectedSnapdragon():
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cpuinfo = []
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with open("/proc/cpuinfo") as cpuinfo_file:
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current_implementer = 0
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current_part = 0
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for line in cpuinfo_file:
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line = line.strip()
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if "CPU implementer" in line:
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current_implementer = int(re.findall(r'0x[0-9A-F]+', line, re.I)[0], 16)
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if "CPU part" in line:
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current_part = int(re.findall(r'0x[0-9A-F]+', line, re.I)[0], 16)
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cpuinfo += {tuple([current_implementer, current_part])}
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for core in cpuinfo:
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if SnapdragonIDsWithDisabledSVE.get(core):
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return True
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return False
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def main():
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Features = GetCPUFeatures()
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# If SVE is reported from cpuinfo just return.
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if "sve" in Features:
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return 0
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if IsAffectedSnapdragon():
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return 1
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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