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1. Don't call Value::getName(), which is slow.

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2. Lower calls to fabs and friends to FABS nodes etc unless the function has
   internal linkage.  Before we wouldn't lower if it had a definition, which
   is incorrect.  This allows us to compile:

define double @fabs(double %f) {
        %tmp2 = tail call double @fabs( double %f )
        ret double %tmp2
}

into:

_fabs:
        fabs f1, f1
        blr 



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41805 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-09-10 21:15:22 +00:00
parent 8d9455d4e4
commit 87b51bc2b0
1 changed files with 52 additions and 38 deletions
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28
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -2969,14 +2969,22 @@ void SelectionDAGLowering::LowerCallTo(Instruction &I,
void SelectionDAGLowering::visitCall(CallInst &I) {
const char *RenameFn = 0;
if (Function *F = I.getCalledFunction()) {
if (F->isDeclaration())
if (F->isDeclaration()) {
if (unsigned IID = F->getIntrinsicID()) {
RenameFn = visitIntrinsicCall(I, IID);
if (!RenameFn)
return;
} else { // Not an LLVM intrinsic.
const std::string &Name = F->getName();
if (Name[0] == 'c' && (Name == "copysign" || Name == "copysignf")) {
}
}
// Check for well-known libc/libm calls. If the function is internal, it
// can't be a library call.
unsigned NameLen = F->getNameLen();
if (!F->hasInternalLinkage() && NameLen) {
const char *NameStr = F->getNameStart();
if (NameStr[0] == 'c' &&
((NameLen == 8 && !strcmp(NameStr, "copysign")) ||
(NameLen == 9 && !strcmp(NameStr, "copysignf")))) {
if (I.getNumOperands() == 3 && // Basic sanity checks.
I.getOperand(1)->getType()->isFloatingPoint() &&
I.getType() == I.getOperand(1)->getType() &&
@ -2987,7 +2995,9 @@ void SelectionDAGLowering::visitCall(CallInst &I) {
LHS, RHS));
return;
}
} else if (Name[0] == 'f' && (Name == "fabs" || Name == "fabsf")) {
} else if (NameStr[0] == 'f' &&
((NameLen == 4 && !strcmp(NameStr, "fabs")) ||
(NameLen == 5 && !strcmp(NameStr, "fabsf")))) {
if (I.getNumOperands() == 2 && // Basic sanity checks.
I.getOperand(1)->getType()->isFloatingPoint() &&
I.getType() == I.getOperand(1)->getType()) {
@ -2995,7 +3005,9 @@ void SelectionDAGLowering::visitCall(CallInst &I) {
setValue(&I, DAG.getNode(ISD::FABS, Tmp.getValueType(), Tmp));
return;
}
} else if (Name[0] == 's' && (Name == "sin" || Name == "sinf")) {
} else if (NameStr[0] == 's' &&
((NameLen == 3 && !strcmp(NameStr, "sin")) ||
(NameLen == 4 && !strcmp(NameStr, "sinf")))) {
if (I.getNumOperands() == 2 && // Basic sanity checks.
I.getOperand(1)->getType()->isFloatingPoint() &&
I.getType() == I.getOperand(1)->getType()) {
@ -3003,7 +3015,9 @@ void SelectionDAGLowering::visitCall(CallInst &I) {
setValue(&I, DAG.getNode(ISD::FSIN, Tmp.getValueType(), Tmp));
return;
}
} else if (Name[0] == 'c' && (Name == "cos" || Name == "cosf")) {
} else if (NameStr[0] == 'c' &&
((NameLen == 3 && !strcmp(NameStr, "cos")) ||
(NameLen == 4 && !strcmp(NameStr, "cosf")))) {
if (I.getNumOperands() == 2 && // Basic sanity checks.
I.getOperand(1)->getType()->isFloatingPoint() &&
I.getType() == I.getOperand(1)->getType()) {