commit 0e489926be00326b09fb4dd51d76c758056d358c
author Matt Arsenault <Matthew.Arsenault@amd.com> Tue Apr 12 11:49:22 2022 -0400
committer Matt Arsenault <Matthew.Arsenault@amd.com> Tue Apr 12 16:54:03 2022 -0400
tree 1cf9e413481e718686b18af39928a600e8df72ad
parent 95c2bcbf8b98c176408e5cce82afef232b788b18

GlobalISel: Handle widening addo/subo booleans

This will be tested in a future patch

llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp

diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
index deba716..370a13e 100644
--- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -1870,9 +1870,6 @@
 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 @@
     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.