AMDGPU: Add second emergency slot for SGPR to vmem for large frames

In a future change, we will sometimes use a VGPR offset for doing
spills to memory, in which case we need 2 free VGPRs to do the SGPR
spill. In most cases we could spill the VGPR along with the SGPR being
spilled, but we don't have any free lanes for SGPR_1024 in wave32 so
we could still potentially need a second scavenging slot.

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Target/AMDGPU/SILowerSGPRSpills.cpp b/llvm/lib/Target/AMDGPU/SILowerSGPRSpills.cpp
index 0fbdbef..ddc1944 100644
--- a/llvm/lib/Target/AMDGPU/SILowerSGPRSpills.cpp
+++ b/llvm/lib/Target/AMDGPU/SILowerSGPRSpills.cpp
@@ -321,7 +321,7 @@ bool SILowerSGPRSpills::runOnMachineFunction(MachineFunction &MF) {
     // free frame index ids by the later pass(es) like "stack slot coloring"
     // which in turn could mess-up with the book keeping of "frame index to VGPR
     // lane".
-    FuncInfo->removeDeadFrameIndices(MFI);
+    FuncInfo->removeDeadFrameIndices(MFI, /*ResetSGPRSpillStackIDs*/ false);
 
     MadeChange = true;
   }