[COFF] Fix section name for constants larger than 64 bits on Windows

APIntToHexString returns wrong value ("0000000000000000ffffffffffffffff")
for integer larger than 64 bits, and thus
TargetLoweringObjectFileCOFF::getSectionForConstant returns same section name
for all numbers larger than 64 bits. This patch tries to fix it.

Differential Revision: https://reviews.llvm.org/D66458
Patch by Senran Zhang

llvm-svn: 369610

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 7abc86d..ae32360 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -1597,7 +1597,8 @@ const MCExpr *TargetLoweringObjectFileCOFF::lowerRelativeReference(
 
 static std::string APIntToHexString(const APInt &AI) {
   unsigned Width = (AI.getBitWidth() / 8) * 2;
-  std::string HexString = utohexstr(AI.getLimitedValue(), /*LowerCase=*/true);
+  std::string HexString = AI.toString(16, /*Signed=*/false);
+  transform(HexString.begin(), HexString.end(), HexString.begin(), tolower);
   unsigned Size = HexString.size();
   assert(Width >= Size && "hex string is too large!");
   HexString.insert(HexString.begin(), Width - Size, '0');