[llvm] [LV] Use make_early_inc_range in handleFindLastReductions (PR #184340)

[Graham Hunter via llvm-commits]

================
@@ -198,3 +198,71 @@ loop:
 exit:
   ret i32 %sel
 }
+
+define i32 @loop_inv_select_condition_issue_182152(i32 %iv.start) {
+; CHECK-LABEL: @loop_inv_select_condition_issue_182152(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[INV_COND:%.*]] = icmp eq i32 0, 0
+; CHECK-NEXT:    [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[IV_START:%.*]], i32 1)
+; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[SMAX]], 1
+; CHECK-NEXT:    [[TMP1:%.*]] = sub i32 [[TMP0]], [[IV_START]]
+; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[TMP1]], 4
+; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK:       vector.ph:
+; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i32 [[TMP1]], 4
+; CHECK-NEXT:    [[N_VEC:%.*]] = sub i32 [[TMP1]], [[N_MOD_VF]]
+; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i1> poison, i1 [[INV_COND]], i64 0
+; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i1> [[BROADCAST_SPLATINSERT]], <4 x i1> poison, <4 x i32> zeroinitializer
+; CHECK-NEXT:    [[TMP2:%.*]] = add i32 [[IV_START]], [[N_VEC]]
+; CHECK-NEXT:    [[TMP3:%.*]] = xor <4 x i1> [[BROADCAST_SPLAT]], splat (i1 true)
+; CHECK-NEXT:    [[TMP4:%.*]] = freeze <4 x i1> [[TMP3]]
+; CHECK-NEXT:    [[TMP5:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[TMP4]])
+; CHECK-NEXT:    [[BROADCAST_SPLATINSERT1:%.*]] = insertelement <4 x i32> poison, i32 [[IV_START]], i64 0
+; CHECK-NEXT:    [[BROADCAST_SPLAT2:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT1]], <4 x i32> poison, <4 x i32> zeroinitializer
+; CHECK-NEXT:    [[INDUCTION:%.*]] = add <4 x i32> [[BROADCAST_SPLAT2]], <i32 0, i32 1, i32 2, i32 3>
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       vector.body:
+; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i32> [ [[INDUCTION]], [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <4 x i32> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP8:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[TMP6:%.*]] = phi <4 x i1> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP7:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[TMP7]] = select i1 [[TMP5]], <4 x i1> [[TMP3]], <4 x i1> [[TMP6]]
+; CHECK-NEXT:    [[TMP8]] = select i1 [[TMP5]], <4 x i32> [[VEC_IND]], <4 x i32> [[VEC_PHI]]
+; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
+; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], splat (i32 4)
+; CHECK-NEXT:    [[TMP9:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
+; CHECK-NEXT:    br i1 [[TMP9]], label [[MIDDLE_BLOCK:%.*]], label [[LOOP]], !llvm.loop [[LOOP6:![0-9]+]]
+; CHECK:       middle.block:
+; CHECK-NEXT:    [[TMP10:%.*]] = call i32 @llvm.experimental.vector.extract.last.active.v4i32(<4 x i32> [[TMP8]], <4 x i1> [[TMP7]], i32 0)
+; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 [[TMP1]], [[N_VEC]]
+; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
+; CHECK:       scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i32 [ [[TMP2]], [[MIDDLE_BLOCK]] ], [ [[IV_START]], [[ENTRY:%.*]] ]
+; CHECK-NEXT:    [[BC_MERGE_RDX:%.*]] = phi i32 [ [[TMP10]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY]] ]
+; CHECK-NEXT:    br label [[LOOP1:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP1]] ]
+; CHECK-NEXT:    [[RDX:%.*]] = phi i32 [ [[BC_MERGE_RDX]], [[SCALAR_PH]] ], [ [[SELECT:%.*]], [[LOOP1]] ]
+; CHECK-NEXT:    [[SELECT]] = select i1 [[INV_COND]], i32 [[RDX]], i32 [[IV]]
+; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], 1
+; CHECK-NEXT:    [[EXIT_COND:%.*]] = icmp sgt i32 [[IV]], 0
+; CHECK-NEXT:    br i1 [[EXIT_COND]], label [[EXIT]], label [[LOOP1]], !llvm.loop [[LOOP7:![0-9]+]]
+; CHECK:       exit:
+; CHECK-NEXT:    [[SELECT_LCSSA:%.*]] = phi i32 [ [[SELECT]], [[LOOP1]] ], [ [[TMP10]], [[MIDDLE_BLOCK]] ]
+; CHECK-NEXT:    ret i32 [[SELECT_LCSSA]]
+;
+entry:
+  %inv_cond = icmp eq i32 0, 0
----------------
huntergr-arm wrote:

done

https://github.com/llvm/llvm-project/pull/184340