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Fix bug: test/Regression/Other/2002-04-07-HexFloatConstants.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2141 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-04-07 08:37:11 +00:00
parent 35c15b4bfe
commit ace9103ebe
1 changed files with 20 additions and 2 deletions
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22
lib/VMCore/Constants.cpp
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@ -13,7 +13,6 @@
#include "llvm/Analysis/SlotCalculator.h"
#include "Support/StringExtras.h"
#include <algorithm>
#include <assert.h>
using std::map;
using std::pair;
@ -159,8 +158,27 @@ std::string ConstantUInt::getStrValue() const {
return utostr(Val.Unsigned);
}
// ConstantFP::getStrValue - We would like to output the FP constant value in
// exponential notation, but we cannot do this if doing so will lose precision.
// Check here to make sure that we only output it in exponential format if we
// can parse the value back and get the same value.
//
std::string ConstantFP::getStrValue() const {
return ftostr(Val);
std::string StrVal = ftostr(Val);
double TestVal = atof(StrVal.c_str()); // Reparse stringized version!
if (TestVal == Val)
return StrVal;
// Otherwise we could not reparse it to exactly the same value, so we must
// output the string in hexadecimal format!
//
// Behave nicely in the face of C TBAA rules... see:
// http://www.nullstone.com/htmls/category/aliastyp.htm
//
char *Ptr = (char*)&Val;
assert(sizeof(double) == sizeof(uint64_t) && sizeof(double) == 8 &&
"assuming that double is 64 bits!");
return "0x"+utohexstr(*(uint64_t*)Ptr);
}
std::string ConstantArray::getStrValue() const {