GlobalISel: Handle widening addo/subo booleans

This will be tested in a future patch

diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
index deba716ee1d874e37eb256db0439a8de7eef872e..370a13e599e96bdc37ab34ab85d13160140d0e0b 100644 (file)
--- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -1870,9 +1870,6 @@ LegalizerHelper::widenScalarInsert(MachineInstr &MI, unsigned TypeIdx,
 LegalizerHelper::LegalizeResult
 LegalizerHelper::widenScalarAddSubOverflow(MachineInstr &MI, unsigned TypeIdx,
                                            LLT WideTy) {
-  if (TypeIdx == 1)
-    return UnableToLegalize; // TODO
-
   unsigned Opcode;
   unsigned ExtOpcode;
   Optional<Register> CarryIn = None;
@@ -1917,6 +1914,18 @@ LegalizerHelper::widenScalarAddSubOverflow(MachineInstr &MI, unsigned TypeIdx,
     break;
   }
 
+  if (TypeIdx == 1) {
+    unsigned BoolExtOp = MIRBuilder.getBoolExtOp(WideTy.isVector(), false);
+
+    Observer.changingInstr(MI);
+    widenScalarDst(MI, WideTy, 1);
+    if (CarryIn)
+      widenScalarSrc(MI, WideTy, 4, BoolExtOp);
+
+    Observer.changedInstr(MI);
+    return Legalized;
+  }
+
   auto LHSExt = MIRBuilder.buildInstr(ExtOpcode, {WideTy}, {MI.getOperand(2)});
   auto RHSExt = MIRBuilder.buildInstr(ExtOpcode, {WideTy}, {MI.getOperand(3)});
   // Do the arithmetic in the larger type.