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Fix volatile load/store of pointers. Consider this testcase:

Browse Source 
void %test(int** %P) {
  %A = volatile load int** %P
  ret void
}

void %test2(int*** %Q) {
  %P = load int*** %Q
  volatile store int** %P, int*** %Q
  ret void
}

instead of emitting:

void test(int **l1_P) {
  int *l2_A;

  l2_A = (int **((volatile int **)l1_P));
  return;
}
void test2(int ***l2_Q) {
  int **l1_P;

  l1_P = *l2_Q;
  *((volatile int ***)l2_Q) = l1_P;
  return;
}

... which is loading/storing volatile pointers, not through volatile pointers,
emit this (which is right):

void test(int **l1_P) {
  int *l3_A;

  l3_A = *((int * volatile*)l1_P);
  return;
}
void test2(int ***l2_Q) {
  int **l1_P;

  l1_P = *l2_Q;
  *((int ** volatile*)l2_Q) = l1_P;
  return;
}


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20191 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-02-15 05:52:14 +00:00
parent 4a9dc294d6
commit 8399e02a2c
2 changed files with 12 additions and 12 deletions
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12
lib/Target/CBackend/CBackend.cpp
View File

@ -1656,9 +1656,9 @@ void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
void CWriter::visitLoadInst(LoadInst &I) {
Out << '*';
if (I.isVolatile()) {
Out << "((volatile ";
printType(Out, I.getOperand(0)->getType());
Out << ")";
Out << "((";
printType(Out, I.getType());
Out << " volatile*)";
}
writeOperand(I.getOperand(0));
@ -1670,9 +1670,9 @@ void CWriter::visitLoadInst(LoadInst &I) {
void CWriter::visitStoreInst(StoreInst &I) {
Out << '*';
if (I.isVolatile()) {
Out << "((volatile ";
printType(Out, I.getPointerOperand()->getType());
Out << ")";
Out << "((";
printType(Out, I.getOperand(0)->getType());
Out << " volatile*)";
}
writeOperand(I.getPointerOperand());
if (I.isVolatile()) Out << ")";

12
lib/Target/CBackend/Writer.cpp
View File

@ -1656,9 +1656,9 @@ void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
void CWriter::visitLoadInst(LoadInst &I) {
Out << '*';
if (I.isVolatile()) {
Out << "((volatile ";
printType(Out, I.getOperand(0)->getType());
Out << ")";
Out << "((";
printType(Out, I.getType());
Out << " volatile*)";
}
writeOperand(I.getOperand(0));
@ -1670,9 +1670,9 @@ void CWriter::visitLoadInst(LoadInst &I) {
void CWriter::visitStoreInst(StoreInst &I) {
Out << '*';
if (I.isVolatile()) {
Out << "((volatile ";
printType(Out, I.getPointerOperand()->getType());
Out << ")";
Out << "((";
printType(Out, I.getOperand(0)->getType());
Out << " volatile*)";
}
writeOperand(I.getPointerOperand());
if (I.isVolatile()) Out << ")";