Resubmit r196544: Apply transformation on OS X 10.9+ and iOS 7.0+: pow(10, x) ―> __exp10(x)

llvm-svn: 197109

2 files changed, 31 insertions, 0 deletions

diff --git a/llvm/lib/Target/TargetLibraryInfo.cpp b/llvm/lib/Target/TargetLibraryInfo.cpp
index 3e68fe16d4a..753562077f9 100644
--- a/llvm/lib/Target/TargetLibraryInfo.cpp
+++ b/llvm/lib/Target/TargetLibraryInfo.cpp
@@ -401,6 +401,31 @@ static void initialize(TargetLibraryInfo &TLI, const Triple &T,
     TLI.setAvailableWithName(LibFunc::fputs, "fputs$UNIX2003");
   }
 
+  // exp10 and exp10f are not available on OS X until 10.9 and iOS until 7.0
+  // and their names are __exp10 and __exp10f. exp10l is not available on
+  // OS X or iOS.
+  if (T.isMacOSX()) {
+    TLI.setUnavailable(LibFunc::exp10l);
+    if (T.isMacOSXVersionLT(10, 9)) {
+      TLI.setUnavailable(LibFunc::exp10);
+      TLI.setUnavailable(LibFunc::exp10f);
+    } else {
+      TLI.setAvailableWithName(LibFunc::exp10, "__exp10");
+      TLI.setAvailableWithName(LibFunc::exp10f, "__exp10f");
+    }
+  }
+
+  if (T.getOS() == Triple::IOS) {
+    TLI.setUnavailable(LibFunc::exp10l);
+    if (T.isOSVersionLT(7, 0)) {
+      TLI.setUnavailable(LibFunc::exp10);
+      TLI.setUnavailable(LibFunc::exp10f);
+    } else {
+      TLI.setAvailableWithName(LibFunc::exp10, "__exp10");
+      TLI.setAvailableWithName(LibFunc::exp10f, "__exp10f");
+    }
+  }
+
   // iprintf and friends are only available on XCore and TCE.
   if (T.getArch() != Triple::xcore && T.getArch() != Triple::tce) {
     TLI.setUnavailable(LibFunc::iprintf);
diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 15b3e66f94a..b555cf8bddb 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -1162,6 +1162,12 @@ struct PowOpt : public UnsafeFPLibCallOptimization {
           hasUnaryFloatFn(TLI, Op1->getType(), LibFunc::exp2, LibFunc::exp2f,
                           LibFunc::exp2l))
         return EmitUnaryFloatFnCall(Op2, "exp2", B, Callee->getAttributes());
+      // pow(10.0, x) -> exp10(x)
+      if (Op1C->isExactlyValue(10.0) &&
+          hasUnaryFloatFn(TLI, Op1->getType(), LibFunc::exp10, LibFunc::exp10f,
+                          LibFunc::exp10l))
+        return EmitUnaryFloatFnCall(Op2, TLI->getName(LibFunc::exp10), B,
+                                    Callee->getAttributes());
     }
 
     ConstantFP *Op2C = dyn_cast<ConstantFP>(Op2);