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llvm.experimental.stackmap: fix encoding of large constants.

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In the stackmap format we advertise the constant field as signed.
However, we were determining whether to promote to a 64-bit constant
pool based on an unsigned comparison.

This fix allows -1 to be encoded as a small constant.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198816 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2014-01-09 00:22:31 +00:00
parent 07ef4fda1b
commit b3ea6d7ce7
2 changed files with 50 additions and 5 deletions
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5
lib/CodeGen/StackMaps.cpp
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@ -207,7 +207,10 @@ void StackMaps::recordStackMapOpers(const MachineInstr &MI, uint64_t ID,
// Move large constants into the constant pool.
for (LocationVec::iterator I = Locations.begin(), E = Locations.end();
I != E; ++I) {
if (I->LocType == Location::Constant && (I->Offset & ~0xFFFFFFFFULL)) {
// Constants are encoded as sign-extended integers.
// -1 is directly encoded as .long 0xFFFFFFFF with no constant pool.
if (I->LocType == Location::Constant &&
((I->Offset + (int64_t(1)<<31)) >> 32) != 0) {
I->LocType = Location::ConstantIndex;
I->Offset = ConstPool.getConstantIndex(I->Offset);
}