[mips] Warn when crc, ginv, virt flags are used with too old revision

CRC and GINV ASE require revision 6, Virtualization requires revision 5.
Print a warning when revision is older than required.

Differential Revision: https://reviews.llvm.org/D48843

llvm-svn: 336296

2 files changed, 33 insertions, 11 deletions

diff --git a/llvm/lib/Target/Mips/MipsSubtarget.cpp b/llvm/lib/Target/Mips/MipsSubtarget.cpp
index e5ba4fa5a8b..0c39a45467c 100644
--- a/llvm/lib/Target/Mips/MipsSubtarget.cpp
+++ b/llvm/lib/Target/Mips/MipsSubtarget.cpp
@@ -61,8 +61,10 @@ static cl::opt<bool>
           cl::desc("Enable gp-relative addressing of mips small data items"));
 
 bool MipsSubtarget::DspWarningPrinted = false;
-
 bool MipsSubtarget::MSAWarningPrinted = false;
+bool MipsSubtarget::VirtWarningPrinted = false;
+bool MipsSubtarget::CRCWarningPrinted = false;
+bool MipsSubtarget::GINVWarningPrinted = false;
 
 void MipsSubtarget::anchor() {}
 
@@ -172,16 +174,27 @@ MipsSubtarget::MipsSubtarget(const Triple &TT, StringRef CPU, StringRef FS,
     }
   }
 
-  if (hasMSA() && !MSAWarningPrinted) {
-    if (hasMips64() && !hasMips64r5()) {
-      errs() << "warning: the 'msa' ASE requires MIPS64 revision 5 or "
-             << "greater\n";
-      MSAWarningPrinted = true;
-    } else if (hasMips32() && !hasMips32r5()) {
-      errs() << "warning: the 'msa' ASE requires MIPS32 revision 5 or "
-             << "greater\n";
-      MSAWarningPrinted = true;
-    }
+  StringRef ArchName = hasMips64() ? "MIPS64" : "MIPS32";
+
+  if (!hasMips32r5() && hasMSA() && !MSAWarningPrinted) {
+    errs() << "warning: the 'msa' ASE requires " << ArchName
+           << " revision 5 or greater\n";
+    MSAWarningPrinted = true;
+  }
+  if (!hasMips32r5() && hasVirt() && !VirtWarningPrinted) {
+    errs() << "warning: the 'virt' ASE requires " << ArchName
+           << " revision 5 or greater\n";
+    VirtWarningPrinted = true;
+  }
+  if (!hasMips32r6() && hasCRC() && !CRCWarningPrinted) {
+    errs() << "warning: the 'crc' ASE requires " << ArchName
+           << " revision 6 or greater\n";
+    CRCWarningPrinted = true;
+  }
+  if (!hasMips32r6() && hasGINV() && !GINVWarningPrinted) {
+    errs() << "warning: the 'ginv' ASE requires " << ArchName
+           << " revision 6 or greater\n";
+    GINVWarningPrinted = true;
   }
 
   CallLoweringInfo.reset(new MipsCallLowering(*getTargetLowering()));
diff --git a/llvm/lib/Target/Mips/MipsSubtarget.h b/llvm/lib/Target/Mips/MipsSubtarget.h
index 0504fc2c579..676d702ba63 100644
--- a/llvm/lib/Target/Mips/MipsSubtarget.h
+++ b/llvm/lib/Target/Mips/MipsSubtarget.h
@@ -54,6 +54,15 @@ class MipsSubtarget : public MipsGenSubtargetInfo {
   // Used to avoid printing msa warnings multiple times.
   static bool MSAWarningPrinted;
 
+  // Used to avoid printing crc warnings multiple times.
+  static bool CRCWarningPrinted;
+
+  // Used to avoid printing ginv warnings multiple times.
+  static bool GINVWarningPrinted;
+
+  // Used to avoid printing virt warnings multiple times.
+  static bool VirtWarningPrinted;
+
   // Mips architecture version
   MipsArchEnum MipsArchVersion;