[llvm-commits] [llvm] r41805 - /llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
Chris Lattner
sabre at nondot.org
Mon Sep 10 14:15:23 PDT 2007
Author: lattner
Date: Mon Sep 10 16:15:22 2007
New Revision: 41805
URL: http://llvm.org/viewvc/llvm-project?rev=41805&view=rev
Log:
1. Don't call Value::getName(), which is slow.
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
Modified:
llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
Modified: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp?rev=41805&r1=41804&r2=41805&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp Mon Sep 10 16:15:22 2007
@@ -2969,50 +2969,64 @@
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")) {
- if (I.getNumOperands() == 3 && // Basic sanity checks.
- I.getOperand(1)->getType()->isFloatingPoint() &&
- I.getType() == I.getOperand(1)->getType() &&
- I.getType() == I.getOperand(2)->getType()) {
- SDOperand LHS = getValue(I.getOperand(1));
- SDOperand RHS = getValue(I.getOperand(2));
- setValue(&I, DAG.getNode(ISD::FCOPYSIGN, LHS.getValueType(),
- LHS, RHS));
- return;
- }
- } else if (Name[0] == 'f' && (Name == "fabs" || Name == "fabsf")) {
- if (I.getNumOperands() == 2 && // Basic sanity checks.
- I.getOperand(1)->getType()->isFloatingPoint() &&
- I.getType() == I.getOperand(1)->getType()) {
- SDOperand Tmp = getValue(I.getOperand(1));
- setValue(&I, DAG.getNode(ISD::FABS, Tmp.getValueType(), Tmp));
- return;
- }
- } else if (Name[0] == 's' && (Name == "sin" || Name == "sinf")) {
- if (I.getNumOperands() == 2 && // Basic sanity checks.
- I.getOperand(1)->getType()->isFloatingPoint() &&
- I.getType() == I.getOperand(1)->getType()) {
- SDOperand Tmp = getValue(I.getOperand(1));
- setValue(&I, DAG.getNode(ISD::FSIN, Tmp.getValueType(), Tmp));
- return;
- }
- } else if (Name[0] == 'c' && (Name == "cos" || Name == "cosf")) {
- if (I.getNumOperands() == 2 && // Basic sanity checks.
- I.getOperand(1)->getType()->isFloatingPoint() &&
- I.getType() == I.getOperand(1)->getType()) {
- SDOperand Tmp = getValue(I.getOperand(1));
- setValue(&I, DAG.getNode(ISD::FCOS, Tmp.getValueType(), Tmp));
- return;
- }
+ }
+ }
+
+ // 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() &&
+ I.getType() == I.getOperand(2)->getType()) {
+ SDOperand LHS = getValue(I.getOperand(1));
+ SDOperand RHS = getValue(I.getOperand(2));
+ setValue(&I, DAG.getNode(ISD::FCOPYSIGN, LHS.getValueType(),
+ LHS, RHS));
+ return;
+ }
+ } 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()) {
+ SDOperand Tmp = getValue(I.getOperand(1));
+ setValue(&I, DAG.getNode(ISD::FABS, Tmp.getValueType(), Tmp));
+ return;
+ }
+ } 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()) {
+ SDOperand Tmp = getValue(I.getOperand(1));
+ setValue(&I, DAG.getNode(ISD::FSIN, Tmp.getValueType(), Tmp));
+ return;
+ }
+ } 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()) {
+ SDOperand Tmp = getValue(I.getOperand(1));
+ setValue(&I, DAG.getNode(ISD::FCOS, Tmp.getValueType(), Tmp));
+ return;
}
}
+ }
} else if (isa<InlineAsm>(I.getOperand(0))) {
visitInlineAsm(I);
return;
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