[ppc64] Skip simd tests if power processor version is earlier than 9

Change-Id: Idabbd2b1326fcca04cd937a730c5418f9c9cf8af
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2855075Reviewed-by: Milad Fa <mfarazma@redhat.com>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Vasili Skurydzin <vasili.skurydzin@ibm.com>
Cr-Commit-Position: refs/heads/master@{#74284}

tools/testrunner/base_runner.py

@@ -658,6 +658,12 @@ class BaseTestRunner(object):
        self.build_config.arch == 'mipsel':
        no_simd_hardware = not simd_mips
 
+    # Ppc64 processors earlier than POWER9 do not support Simd instructions
+    if self.build_config.arch == 'ppc64' and \
+       not self.build_config.simulator_run and \
+       utils.GuessPowerProcessorVersion() < 9:
+       no_simd_hardware = True
+
     return {
       "arch": self.build_config.arch,
       "asan": self.build_config.asan,

tools/testrunner/local/utils.py

@@ -97,6 +97,58 @@ def GuessOS():
     return None
 
 
+# Returns power processor version, taking compatibility mode into account.
+# (Power9 running in Power8 compatibility mode returns 8)
+# Only useful if arch is ppc64
+def GuessPowerProcessorVersion():
+  import ctypes, ctypes.util
+  os = GuessOS()
+  if os == 'linux':
+    AT_PLATFORM = 15 # from linux/auxvec.h
+    _LIBC = ctypes.CDLL(ctypes.util.find_library('c'))
+    _LIBC.getauxval.argtypes = [ctypes.c_ulong]
+    _LIBC.getauxval.restype = ctypes.c_char_p
+    at_platform = _LIBC.getauxval(AT_PLATFORM).decode('utf-8').lower()
+    if at_platform.startswith('power6'):
+      return 6
+    elif at_platform.startswith('power7'):
+      return 7
+    elif at_platform.startswith('power8'):
+      return 8
+    elif at_platform.startswith('power9'):
+      return 9
+    elif at_platform.startswith('power10'):
+      return 10
+    else:
+      raise Exception('Unable to guess power processor version')
+  elif os == 'aix':
+    # covers aix and os400
+    RTLD_MEMBER = 0x00040000
+    _LIBC = ctypes.CDLL(ctypes.util.find_library('c'),
+                        ctypes.DEFAULT_MODE | RTLD_MEMBER)
+    class _system_configuration(ctypes.Structure):
+      _fields_ = [
+        ('architecture', ctypes.c_int),
+        ('implementation', ctypes.c_int),
+      ]
+    cfg = _system_configuration.in_dll(_LIBC, '_system_configuration')
+    # Values found in sys/systemcfg.h
+    if cfg.implementation == 0x4000:
+      return 6
+    elif cfg.implementation == 0x8000:
+      return 7
+    elif cfg.implementation == 0x10000:
+      return 8
+    elif cfg.implementation == 0x20000:
+      return 9
+    elif cfg.implementation == 0x40000:
+      return 10
+    else:
+      raise Exception('Unable to guess power processor version')
+  else:
+    raise Exception('Unable to guess power processor version')
+
+
 def UseSimulator(arch):
   machine = platform.machine()
   return (machine and