From 52fb79b7f9792999b18c1230b5ababaa48df9c85 Mon Sep 17 00:00:00 2001 From: Dale Johannesen Date: Fri, 25 Sep 2009 17:23:22 +0000 Subject: [PATCH] Generate FSQRT from calls to the sqrt function, which allows appropriate backends to generate a sqrt instruction. On x86, this isn't done at -O0 because we go through FastISel instead. This is a behavior change from before this series of sqrt patches started. I think this is OK considering that compile speed is most important at -O0, but could be convinced otherwise. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82778 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp index 36e7285f207..8431e20d831 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp @@ -4576,6 +4576,15 @@ void SelectionDAGLowering::visitCall(CallInst &I) { Tmp.getValueType(), Tmp)); return; } + } else if (Name == "sqrt" || Name == "sqrtf" || Name == "sqrtl") { + if (I.getNumOperands() == 2 && // Basic sanity checks. + I.getOperand(1)->getType()->isFloatingPoint() && + I.getType() == I.getOperand(1)->getType()) { + SDValue Tmp = getValue(I.getOperand(1)); + setValue(&I, DAG.getNode(ISD::FSQRT, getCurDebugLoc(), + Tmp.getValueType(), Tmp)); + return; + } } } } else if (isa(I.getOperand(0))) {