Instructions for Book E PPC should be word aligned, set function alignment to reflect this

llvm-svn: 142194
2011-10-17 17:01:41 +00:00 · 2011-10-17 17:01:41 +00:00 · 0ade47acd0
parent b7d9ee707d
commit 0ade47acd0
1 changed files with 10 additions and 3 deletions
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@ -402,9 +402,16 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
    setLibcallName(RTLIB::EXP2_PPCF128, "exp2l$LDBL128");
  }

-  setMinFunctionAlignment(2);
-  if (PPCSubTarget.isDarwin())
-    setPrefFunctionAlignment(4);
+  if (PPCSubTarget.isBookE()) {
+    // Book E: Instructions are always four bytes long and word-aligned.
+    setMinFunctionAlignment(4);
+    setPrefFunctionAlignment(8);
+  }
+  else {
+    setMinFunctionAlignment(2);
+    if (PPCSubTarget.isDarwin())
+      setPrefFunctionAlignment(4);
+  }

  setInsertFencesForAtomic(true);