maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

To not break TBAA rules, use a union. 

llvm-svn: 19280
This commit is contained in:
Chris Lattner 2005-01-04 01:56:57 +00:00
parent 623bacf418
commit 472cc1062d
1 changed files with 9 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
llvm/lib/VMCore/AsmWriter.cpp
View File

@ -421,7 +421,8 @@ static void WriteConstantInt(std::ostream &Out, const Constant *CV,
(StrVal[1] >= '0' && StrVal[1] <= '9'))) (StrVal[1] >= '0' && StrVal[1] <= '9')))
// Reparse stringized version! // Reparse stringized version!
if (atof(StrVal.c_str()) == CFP->getValue()) { if (atof(StrVal.c_str()) == CFP->getValue()) {
Out << StrVal; return; Out << StrVal;
return;
} }
// Otherwise we could not reparse it to exactly the same value, so we must // Otherwise we could not reparse it to exactly the same value, so we must
@ -430,11 +431,14 @@ static void WriteConstantInt(std::ostream &Out, const Constant *CV,
// Behave nicely in the face of C TBAA rules... see: // Behave nicely in the face of C TBAA rules... see:
// http://www.nullstone.com/htmls/category/aliastyp.htm // http://www.nullstone.com/htmls/category/aliastyp.htm
// //
double Val = CFP->getValue(); union {
char *Ptr = (char*)&Val; double D;
assert(sizeof(double) == sizeof(uint64_t) && sizeof(double) == 8 && uint64_t U;
} V;
V.D = CFP->getValue();
assert(sizeof(double) == sizeof(uint64_t) &&
"assuming that double is 64 bits!"); "assuming that double is 64 bits!");
Out << "0x" << utohexstr(*(uint64_t*)Ptr); Out << "0x" << utohexstr(V.U);
} else if (isa<ConstantAggregateZero>(CV)) { } else if (isa<ConstantAggregateZero>(CV)) {
Out << "zeroinitializer"; Out << "zeroinitializer";