[PATCH] D24521: [ARM] Add Marvell PJ4 cpu

[Kai Nacke via llvm-commits]

Kai created this revision.
Kai added a reviewer: rengolin.
Kai added a subscriber: llvm-commits.
Herald added subscribers: samparker, rengolin, aemerson.

The Marvell PJ4 cpus are ARMv7 compliant cpus similar to Cortex-A8 but based on a custom design.

This patch adds basic support for the PJ4 cpus. Details can be found in the Linux kernel README https://www.kernel.org/doc/readme/Documentation-arm-Marvell-README.

https://reviews.llvm.org/D24521

Files:
  lib/Support/Host.cpp
  lib/Target/ARM/ARM.td
  lib/Target/ARM/ARMSubtarget.cpp
  lib/Target/ARM/ARMSubtarget.h

Index: lib/Target/ARM/ARMSubtarget.h
===================================================================
--- lib/Target/ARM/ARMSubtarget.h
+++ lib/Target/ARM/ARMSubtarget.h
@@ -45,7 +45,7 @@
     Others, CortexA5, CortexA7, CortexA8, CortexA9, CortexA12, CortexA15,
     CortexA17, CortexR4, CortexR4F, CortexR5, CortexR7, CortexM3,
     CortexA32, CortexA35, CortexA53, CortexA57, CortexA72, CortexA73,
-    Krait, Swift, ExynosM1
+    Krait, Swift, ExynosM1, MarvellPJ4
   };
   enum ARMProcClassEnum {
     None, AClass, RClass, MClass
Index: lib/Target/ARM/ARMSubtarget.cpp
===================================================================
--- lib/Target/ARM/ARMSubtarget.cpp
+++ lib/Target/ARM/ARMSubtarget.cpp
@@ -239,6 +239,7 @@
   case CortexR7:
   case CortexM3:
   case ExynosM1:
+  case MarvellPJ4:
     break;
   case Krait:
     PreISelOperandLatencyAdjustment = 1;
Index: lib/Target/ARM/ARM.td
===================================================================
--- lib/Target/ARM/ARM.td
+++ lib/Target/ARM/ARM.td
@@ -344,6 +344,9 @@
 def ProcSwift   : SubtargetFeature<"swift", "ARMProcFamily", "Swift",
                                    "Swift ARM processors", []>;
 
+def ProcMarvellPJ4 : SubtargetFeature<"marvellpj4", "ARMProcFamily", "MarvellPJ4",
+                                      "Marvell PJ4 processors", []>;
+
 def ProcExynosM1 : SubtargetFeature<"exynosm1", "ARMProcFamily", "ExynosM1",
                                     "Samsung Exynos-M1 processors", []>;
 
@@ -792,6 +795,13 @@
                                                          FeatureCrypto,
                                                          FeatureZCZeroing]>;
 
+def : ProcNoItin<"marvell-pj4",                         [HasV7Ops, ProcMarvellPJ4,
+                                                         FeatureVFP3,
+                                                         FeatureFP16,
+                                                         FeatureDSP,
+                                                         FeatureHWDiv,
+                                                         FeatureThumb2]>;
+
 def : ProcNoItin<"exynos-m1",                           [ARMv8a, ProcExynosM1,
                                                          FeatureHWDiv,
                                                          FeatureHWDivARM,
Index: lib/Support/Host.cpp
===================================================================
--- lib/Support/Host.cpp
+++ lib/Support/Host.cpp
@@ -1093,6 +1093,25 @@
             .Case("0x06f", "krait") // APQ8064
             .Default("generic");
 
+  if (Implementer == "0x56") { // Marvell Technology Group Ltd.
+    // Look for the CPU architecture line.
+    for (unsigned I = 0, E = Lines.size(); I != E; ++I)
+      if (Lines[I].startswith("CPU architecture"))
+        // Architecture must be ARMv7.
+        if (Lines[I].substr(16).ltrim("\t :") != "7")
+          return "generic";
+    // Look for the CPU part line.
+    for (unsigned I = 0, E = Lines.size(); I != E; ++I)
+      if (Lines[I].startswith("CPU part"))
+        // The CPU part is a 3 digit hexadecimal number with a 0x prefix. The
+        // values correspond to the "Part number" in the CP15/c0 register. The
+        // contents are specified in the various processor manuals.
+        return StringSwitch<const char *>(Lines[I].substr(8).ltrim("\t :"))
+            .Case("0x581", "marvell-pj4") // Sheeva PJ4 / PJ4B
+            .Case("0x584", "marvell-pj4") // Sheeva PJ4B-MP / PJ4C
+            .Default("generic");
+  }
+
   return "generic";
 }
 #elif defined(__linux__) && defined(__s390x__)


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