Check for both styles of clobbers, those produced by dragonegg and

those produced by clang for the inline asm bswap conversion.

Modified from a patch by Chris Smowton.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194016 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 19 insertions, 11 deletions

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 7648ddc681..86ad2621fb 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -19182,6 +19182,22 @@ namespace {
   const VariadicFunction1<bool, StringRef, StringRef, matchAsmImpl> matchAsm={};
 }
 
+static bool clobbersFlagRegisters(const SmallVector<StringRef, 4> &AsmPieces) {
+
+  if (AsmPieces.size() == 3 || AsmPieces.size() == 4) {
+    if (std::count(AsmPieces.begin(), AsmPieces.end(), "~{cc}") &&
+        std::count(AsmPieces.begin(), AsmPieces.end(), "~{flags}") &&
+        std::count(AsmPieces.begin(), AsmPieces.end(), "~{fpsr}")) {
+
+      if (AsmPieces.size() == 3)
+        return true;
+      else if (std::count(AsmPieces.begin(), AsmPieces.end(), "~{dirflag}"))
+        return true;
+    }
+  }
+  return false;
+}
+
 bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
   InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
 
@@ -19223,12 +19239,8 @@ bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
       const std::string &ConstraintsStr = IA->getConstraintString();
       SplitString(StringRef(ConstraintsStr).substr(5), AsmPieces, ",");
       array_pod_sort(AsmPieces.begin(), AsmPieces.end());
-      if (AsmPieces.size() == 4 &&
-          AsmPieces[0] == "~{cc}" &&
-          AsmPieces[1] == "~{dirflag}" &&
-          AsmPieces[2] == "~{flags}" &&
-          AsmPieces[3] == "~{fpsr}")
-      return IntrinsicLowering::LowerToByteSwap(CI);
+      if (clobbersFlagRegisters(AsmPieces))
+        return IntrinsicLowering::LowerToByteSwap(CI);
     }
     break;
   case 3:
@@ -19241,11 +19253,7 @@ bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
       const std::string &ConstraintsStr = IA->getConstraintString();
       SplitString(StringRef(ConstraintsStr).substr(5), AsmPieces, ",");
       array_pod_sort(AsmPieces.begin(), AsmPieces.end());
-      if (AsmPieces.size() == 4 &&
-          AsmPieces[0] == "~{cc}" &&
-          AsmPieces[1] == "~{dirflag}" &&
-          AsmPieces[2] == "~{flags}" &&
-          AsmPieces[3] == "~{fpsr}")
+      if (clobbersFlagRegisters(AsmPieces))
         return IntrinsicLowering::LowerToByteSwap(CI);
     }