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| author | Andrew Trick <atrick@apple.com> | 2014-01-09 00:22:31 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2014-01-09 00:22:31 +0000 |
| commit | b3ea6d7ce7cdc3a7c5a49257cc28fdba56670d4f (patch) | |
| tree | a54317962f5b932c18d6ad8d12534e296db4c282 /lib/CodeGen/StackMaps.cpp | |
| parent | 07ef4fda1b02dcc9bda6cbf6665f2b76de5c13a8 (diff) | |
| download | llvm-b3ea6d7ce7cdc3a7c5a49257cc28fdba56670d4f.tar.gz llvm-b3ea6d7ce7cdc3a7c5a49257cc28fdba56670d4f.tar.bz2 llvm-b3ea6d7ce7cdc3a7c5a49257cc28fdba56670d4f.tar.xz | |
llvm.experimental.stackmap: fix encoding of large constants.
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
Diffstat (limited to 'lib/CodeGen/StackMaps.cpp')
| -rw-r--r-- | lib/CodeGen/StackMaps.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/StackMaps.cpp b/lib/CodeGen/StackMaps.cpp index 1dc76d5c6a..d70e6b3044 100644 --- a/lib/CodeGen/StackMaps.cpp +++ b/lib/CodeGen/StackMaps.cpp @@ -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); } |