Make sure sin, cos, sqrt calls are marked readonly

before producing FSIN, FCOS, FSQRT.  If they aren't
so marked we have to assume they might set errno.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82781 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp

@@ -4561,7 +4561,8 @@ void SelectionDAGLowering::visitCall(CallInst &I) {
       } else if (Name == "sin" || Name == "sinf" || Name == "sinl") {
         if (I.getNumOperands() == 2 &&   // Basic sanity checks.
             I.getOperand(1)->getType()->isFloatingPoint() &&
-            I.getType() == I.getOperand(1)->getType()) {
+            I.getType() == I.getOperand(1)->getType() &&
+            I.onlyReadsMemory()) {
           SDValue Tmp = getValue(I.getOperand(1));
           setValue(&I, DAG.getNode(ISD::FSIN, getCurDebugLoc(),
                                    Tmp.getValueType(), Tmp));
@@ -4570,7 +4571,8 @@ void SelectionDAGLowering::visitCall(CallInst &I) {
       } else if (Name == "cos" || Name == "cosf" || Name == "cosl") {
         if (I.getNumOperands() == 2 &&   // Basic sanity checks.
             I.getOperand(1)->getType()->isFloatingPoint() &&
-            I.getType() == I.getOperand(1)->getType()) {
+            I.getType() == I.getOperand(1)->getType() &&
+            I.onlyReadsMemory()) {
           SDValue Tmp = getValue(I.getOperand(1));
           setValue(&I, DAG.getNode(ISD::FCOS, getCurDebugLoc(),
                                    Tmp.getValueType(), Tmp));
@@ -4579,7 +4581,8 @@ void SelectionDAGLowering::visitCall(CallInst &I) {
       } 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()) {
+            I.getType() == I.getOperand(1)->getType() &&
+            I.onlyReadsMemory()) {
           SDValue Tmp = getValue(I.getOperand(1));
           setValue(&I, DAG.getNode(ISD::FSQRT, getCurDebugLoc(),
                                    Tmp.getValueType(), Tmp));