[MIPS GlobalISel] Select G_UADDO

Lower G_UADDO.
Legalize G_UADDO for MIPS32

Differential Revision: https://reviews.llvm.org/D58671

llvm-svn: 354900

1 files changed, 12 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
index 7abce5a3fa8..67f90cd2ab3 100644
--- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -1545,6 +1545,18 @@ LegalizerHelper::lower(MachineInstr &MI, unsigned TypeIdx, LLT Ty) {
   case TargetOpcode::G_CTTZ:
   case TargetOpcode::G_CTPOP:
     return lowerBitCount(MI, TypeIdx, Ty);
+  case G_UADDO: {
+    unsigned Res = MI.getOperand(0).getReg();
+    unsigned CarryOut = MI.getOperand(1).getReg();
+    unsigned LHS = MI.getOperand(2).getReg();
+    unsigned RHS = MI.getOperand(3).getReg();
+
+    MIRBuilder.buildAdd(Res, LHS, RHS);
+    MIRBuilder.buildICmp(CmpInst::ICMP_ULT, CarryOut, Res, RHS);
+
+    MI.eraseFromParent();
+    return Legalized;
+  }
   case G_UADDE: {
     unsigned Res = MI.getOperand(0).getReg();
     unsigned CarryOut = MI.getOperand(1).getReg();