[llvm] r277972 - [SimplifyLibCalls] Emit sqrt intrinsic instead of a libcall.

[Davide Italiano via llvm-commits]

Author: davide
Date: Sun Aug  7 22:23:01 2016
New Revision: 277972

URL: http://llvm.org/viewvc/llvm-project?rev=277972&view=rev
Log:
[SimplifyLibCalls] Emit sqrt intrinsic instead of a libcall.

Modified:
    llvm/trunk/lib/Transforms/Utils/SimplifyLibCalls.cpp
    llvm/trunk/test/Transforms/InstCombine/pow-sqrt.ll

Modified: llvm/trunk/lib/Transforms/Utils/SimplifyLibCalls.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/SimplifyLibCalls.cpp?rev=277972&r1=277971&r2=277972&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Utils/SimplifyLibCalls.cpp (original)
+++ llvm/trunk/lib/Transforms/Utils/SimplifyLibCalls.cpp Sun Aug  7 22:23:01 2016
@@ -1052,8 +1052,9 @@ Value *LibCallSimplifier::optimizePow(Ca
     if (CI->hasUnsafeAlgebra()) {
       IRBuilder<>::FastMathFlagGuard Guard(B);
       B.setFastMathFlags(CI->getFastMathFlags());
-      return emitUnaryFloatFnCall(Op1, TLI->getName(LibFunc::sqrt), B,
-                                  Callee->getAttributes());
+      Value *Sqrt = Intrinsic::getDeclaration(CI->getModule(), Intrinsic::sqrt,
+                                              Op1->getType());
+      return B.CreateCall(Sqrt, Op1, "sqrt");
     }
 
     // Expand pow(x, 0.5) to (x == -infinity ? +infinity : fabs(sqrt(x))).

Modified: llvm/trunk/test/Transforms/InstCombine/pow-sqrt.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/pow-sqrt.ll?rev=277972&r1=277971&r2=277972&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/pow-sqrt.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/pow-sqrt.ll Sun Aug  7 22:23:01 2016
@@ -6,7 +6,7 @@ define double @pow_half(double %x) {
 }
 
 ; CHECK-LABEL: define double @pow_half(
-; CHECK-NEXT:  %sqrt = call fast double @sqrt(double %x)
+; CHECK-NEXT:  %sqrt = call fast double @llvm.sqrt.f64(double %x)
 ; CHECK-NEXT:  ret double %sqrt
 
 declare double @llvm.pow.f64(double, double)