Make uadd_with_overflow scalarizable

Author: Icohedron

llvm/lib/Analysis/VectorUtils.cpp

@@ -125,6 +125,7 @@ bool llvm::isTriviallyScalarizable(Intrinsic::ID ID,
   // https://github.com/llvm/llvm-project/issues/112408
   switch (ID) {
   case Intrinsic::frexp:
+  case Intrinsic::uadd_with_overflow:
     return true;
   }
   return false;

llvm/test/Transforms/Scalarizer/uadd_overflow.ll

@@ -1,13 +1,21 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
 ; RUN: opt %s -passes='function(scalarizer)' -S | FileCheck %s
 
-; Test to make sure that struct return intrinsics that are not `isTriviallyScalarizable` do not get scalarized.
-
 define <3 x i32> @test_(<3 x i32> %a, <3 x i32> %b) {
 ; CHECK-LABEL: define <3 x i32> @test_(
 ; CHECK-SAME: <3 x i32> [[A:%.*]], <3 x i32> [[B:%.*]]) {
-; CHECK-NEXT:    [[R:%.*]] = call { <3 x i32>, <3 x i1> } @llvm.uadd.with.overflow.v3i32(<3 x i32> [[B]], <3 x i32> [[B]])
-; CHECK-NEXT:    [[EL:%.*]] = extractvalue { <3 x i32>, <3 x i1> } [[R]], 0
+; CHECK-NEXT:    [[B_I0:%.*]] = extractelement <3 x i32> [[B]], i64 0
+; CHECK-NEXT:    [[R_I0:%.*]] = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[B_I0]], i32 [[B_I0]])
+; CHECK-NEXT:    [[B_I1:%.*]] = extractelement <3 x i32> [[B]], i64 1
+; CHECK-NEXT:    [[R_I1:%.*]] = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[B_I1]], i32 [[B_I1]])
+; CHECK-NEXT:    [[B_I2:%.*]] = extractelement <3 x i32> [[B]], i64 2
+; CHECK-NEXT:    [[R_I2:%.*]] = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[B_I2]], i32 [[B_I2]])
+; CHECK-NEXT:    [[EL_ELEM0:%.*]] = extractvalue { i32, i1 } [[R_I0]], 0
+; CHECK-NEXT:    [[EL_ELEM01:%.*]] = extractvalue { i32, i1 } [[R_I1]], 0
+; CHECK-NEXT:    [[EL_ELEM02:%.*]] = extractvalue { i32, i1 } [[R_I2]], 0
+; CHECK-NEXT:    [[EL_UPTO0:%.*]] = insertelement <3 x i32> poison, i32 [[EL_ELEM0]], i64 0
+; CHECK-NEXT:    [[EL_UPTO1:%.*]] = insertelement <3 x i32> [[EL_UPTO0]], i32 [[EL_ELEM01]], i64 1
+; CHECK-NEXT:    [[EL:%.*]] = insertelement <3 x i32> [[EL_UPTO1]], i32 [[EL_ELEM02]], i64 2
 ; CHECK-NEXT:    ret <3 x i32> [[EL]]
 ;
   %r = call { <3 x i32>, <3 x i1> } @llvm.uadd.with.overflow.v3i32(<3 x i32> %b, <3 x i32> %b)