[PATCH] D67600: AMDGPU/GlobalISel: Allow scc/vcc alternative mappings for s1 constants

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: tstellar, nhaehnle, kerbowa.
Herald added subscribers: Petar.Avramovic, t-tye, tpr, dstuttard, rovka, yaxunl, wdng, jvesely, kzhuravl.

https://reviews.llvm.org/D67600

Files:
  lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp


Index: lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
===================================================================
--- lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
+++ lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
@@ -339,7 +339,21 @@
 
   InstructionMappings AltMappings;
   switch (MI.getOpcode()) {
-  case TargetOpcode::G_CONSTANT:
+  case TargetOpcode::G_CONSTANT: {
+    unsigned Size = getSizeInBits(MI.getOperand(0).getReg(), MRI, *TRI);
+    if (Size == 1) {
+      static const OpRegBankEntry<1> Table[4] = {
+        { { AMDGPU::VGPRRegBankID }, 1 },
+        { { AMDGPU::SGPRRegBankID }, 1 },
+        { { AMDGPU::VCCRegBankID }, 1 },
+        { { AMDGPU::SCCRegBankID }, 1 }
+      };
+
+      return addMappingFromTable<1>(MI, MRI, { 0 }, Table);
+    }
+
+    LLVM_FALLTHROUGH;
+  }
   case TargetOpcode::G_FCONSTANT:
   case TargetOpcode::G_FRAME_INDEX:
   case TargetOpcode::G_GLOBAL_VALUE: {


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