Optimize sprintf -> siprintf if there are no floating point arguments

and siprintf is available on the target.

llvm-svn: 126937

2 files changed, 32 insertions, 10 deletions

diff --git a/llvm/lib/Target/TargetLibraryInfo.cpp b/llvm/lib/Target/TargetLibraryInfo.cpp
index 6bf6c0d1a6b..345d914a580 100644
--- a/llvm/lib/Target/TargetLibraryInfo.cpp
+++ b/llvm/lib/Target/TargetLibraryInfo.cpp
@@ -31,9 +31,11 @@ static void initialize(TargetLibraryInfo &TLI, const Triple &T) {
   if (T.getOS() != Triple::Darwin || T.getDarwinMajorNumber() < 9)
     TLI.setUnavailable(LibFunc::memset_pattern16);
 
-  // iprintf is only available on XCore.
-  if (T.getArch() != Triple::xcore)
+  // iprintf and friends are only available on XCore.
+  if (T.getArch() != Triple::xcore) {
     TLI.setUnavailable(LibFunc::iprintf);
+    TLI.setUnavailable(LibFunc::siprintf);
+  }
 }
 
 
diff --git a/llvm/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index c0bef26291a..60f235ce3c8 100644
--- a/llvm/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -1176,14 +1176,8 @@ struct PrintFOpt : public LibCallOptimization {
 // 'sprintf' Optimizations
 
 struct SPrintFOpt : public LibCallOptimization {
-  virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
-    // Require two fixed pointer arguments and an integer result.
-    const FunctionType *FT = Callee->getFunctionType();
-    if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
-        !FT->getParamType(1)->isPointerTy() ||
-        !FT->getReturnType()->isIntegerTy())
-      return 0;
-
+  Value *OptimizeFixedFormatString(Function *Callee, CallInst *CI,
+                                   IRBuilder<> &B) {
     // Check for a fixed format string.
     std::string FormatStr;
     if (!GetConstantStringInfo(CI->getArgOperand(1), FormatStr))
@@ -1244,6 +1238,32 @@ struct SPrintFOpt : public LibCallOptimization {
     }
     return 0;
   }
+
+  virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+    // Require two fixed pointer arguments and an integer result.
+    const FunctionType *FT = Callee->getFunctionType();
+    if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
+        !FT->getParamType(1)->isPointerTy() ||
+        !FT->getReturnType()->isIntegerTy())
+      return 0;
+
+    if (Value *V = OptimizeFixedFormatString(Callee, CI, B)) {
+      return V;
+    }
+
+    // sprintf(str, format, ...) -> iprintf(str, format, ...) if no floating
+    // point arguments.
+    if (TLI->has(LibFunc::siprintf) && !CallHasFloatingPointArgument(CI)) {
+      Module *M = B.GetInsertBlock()->getParent()->getParent();
+      Constant *SIPrintFFn =
+        M->getOrInsertFunction("siprintf", FT, Callee->getAttributes());
+      CallInst *New = cast<CallInst>(CI->clone());
+      New->setCalledFunction(SIPrintFFn);
+      B.Insert(New);
+      return New;
+    }
+    return 0;
+  }
 };
 
 //===---------------------------------------===//