[PATCH] D80757: [PowerPC] Add clang option -m[no-]pcrel

[Lei Huang via Phabricator via cfe-commits]

lei created this revision.
lei added reviewers: stefanp, nemanjai, hfinkel, power-llvm-team.
Herald added subscribers: shchenz, wuzish.
Herald added a project: clang.

Add user-facing front end option to turn off pc-relative memops.
This will be compatible with gcc.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D80757

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Basic/Targets/PPC.cpp
  clang/lib/Basic/Targets/PPC.h
  clang/test/Driver/ppc-pcrel.cpp


Index: clang/test/Driver/ppc-pcrel.cpp
===================================================================
--- /dev/null
+++ clang/test/Driver/ppc-pcrel.cpp
@@ -0,0 +1,12 @@
+// RUN: %clang -target powerpc64-unknown-linux-gnu %s -### -mcpu=pwr10 -mpcrel -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-PCREL %s
+// RUN: %clang -target powerpc64-unknown-linux-gnu %s -### -mcpu=pwr10 -mno-pcrel -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-NOPCREL %s
+// CHECK-NOPCREL: "-target-feature" "-pcrel"
+// CHECK-PCREL: "-target-feature" "+pcrel"
+
+// RUN: %clang -target powerpc64-unknown-linux-gnu -mcpu=pwr10 -emit-llvm -S %s -o - | grep "attributes.*+pcrelative-memops"
+// RUN: %clang -target powerpc64-unknown-linux-gnu -mcpu=pwr10 -mpcrel -emit-llvm -S %s -o - | grep "attributes.*+pcrelative-memops"
+// RUN: %clang -target powerpc64-unknown-linux-gnu -mcpu=pwr10 -mno-pcrel -emit-llvm -S %s -o - | grep "attributes.*\-pcrelative-memops"
+
+int main(int argc, char *argv[]) {
+  return 0;
+}
Index: clang/lib/Basic/Targets/PPC.h
===================================================================
--- clang/lib/Basic/Targets/PPC.h
+++ clang/lib/Basic/Targets/PPC.h
@@ -69,6 +69,7 @@
   bool HasExtDiv = false;
   bool HasP9Vector = false;
   bool HasSPE = false;
+  bool HasPCRelativeMemops = false;
 
 protected:
   std::string ABI;
Index: clang/lib/Basic/Targets/PPC.cpp
===================================================================
--- clang/lib/Basic/Targets/PPC.cpp
+++ clang/lib/Basic/Targets/PPC.cpp
@@ -54,6 +54,8 @@
       HasFloat128 = true;
     } else if (Feature == "+power9-vector") {
       HasP9Vector = true;
+    } else if (Feature == "+pcrelative-memops") {
+      HasPCRelativeMemops = true;
     } else if (Feature == "+spe") {
       HasSPE = true;
       LongDoubleWidth = LongDoubleAlign = 64;
@@ -346,6 +348,7 @@
 void PPCTargetInfo::addP10SpecificFeatures(
     llvm::StringMap<bool> &Features) const {
   Features["htm"] = false; // HTM was removed for P10.
+  Features["pcrelative-memops"] = true;
   return;
 }
 
@@ -369,6 +372,7 @@
       .Case("extdiv", HasExtDiv)
       .Case("float128", HasFloat128)
       .Case("power9-vector", HasP9Vector)
+      .Case("pcrelative-memops", HasPCRelativeMemops)
       .Case("spe", HasSPE)
       .Default(false);
 }
@@ -389,7 +393,10 @@
       Features["vsx"] = Features["altivec"] = true;
     if (Name == "power9-vector")
       Features["power8-vector"] = true;
-    Features[Name] = true;
+    if (Name == "pcrel")
+      Features["pcrelative-memops"] = true;
+    else
+      Features[Name] = true;
   } else {
     // If we're disabling altivec or vsx go ahead and disable all of the vsx
     // features.
@@ -398,7 +405,10 @@
           Features["float128"] = Features["power9-vector"] = false;
     if (Name == "power8-vector")
       Features["power9-vector"] = false;
-    Features[Name] = false;
+    if (Name == "pcrel")
+      Features["pcrelative-memops"] = false;
+    else
+      Features[Name] = false;
   }
 }
 
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -2470,6 +2470,8 @@
 def fno_altivec : Flag<["-"], "fno-altivec">, Group<f_Group>, Flags<[DriverOption]>;
 def maltivec : Flag<["-"], "maltivec">, Group<m_ppc_Features_Group>;
 def mno_altivec : Flag<["-"], "mno-altivec">, Group<m_ppc_Features_Group>;
+def mpcrel: Flag<["-"], "mpcrel">, Group<m_ppc_Features_Group>;
+def mno_pcrel: Flag<["-"], "mno-pcrel">, Group<m_ppc_Features_Group>;
 def mspe : Flag<["-"], "mspe">, Group<m_ppc_Features_Group>;
 def mno_spe : Flag<["-"], "mno-spe">, Group<m_ppc_Features_Group>;
 def mvsx : Flag<["-"], "mvsx">, Group<m_ppc_Features_Group>;


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