[LSR][NFC] Add pre-commit test

Author: skachkov-sc

llvm/test/Transforms/LoopStrengthReduce/duplicated-phis.ll

@@ -0,0 +1,85 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -S -loop-reduce %s | FileCheck %s
+; REQUIRES: x86-registered-target
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define i64 @test_duplicated_phis(i64 noundef %N) {
+; CHECK-LABEL: define i64 @test_duplicated_phis(
+; CHECK-SAME: i64 noundef [[N:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*]]:
+; CHECK-NEXT:    [[MUL:%.*]] = shl i64 [[N]], 1
+; CHECK-NEXT:    [[CMP6_NOT:%.*]] = icmp eq i64 [[MUL]], 0
+; CHECK-NEXT:    br i1 [[CMP6_NOT]], label %[[FOR_END:.*]], label %[[FOR_BODY_PREHEADER:.*]]
+; CHECK:       [[FOR_BODY_PREHEADER]]:
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp ult i64 [[MUL]], 4
+; CHECK-NEXT:    br i1 [[TMP0]], label %[[FOR_END_LOOPEXIT_UNR_LCSSA:.*]], label %[[FOR_BODY_PREHEADER_NEW:.*]]
+; CHECK:       [[FOR_BODY_PREHEADER_NEW]]:
+; CHECK-NEXT:    [[UNROLL_ITER:%.*]] = and i64 [[MUL]], -4
+; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
+; CHECK:       [[FOR_BODY]]:
+; CHECK-NEXT:    [[LSR_IV:%.*]] = phi i64 [ [[LSR_IV_NEXT:%.*]], %[[FOR_BODY]] ], [ -1, %[[FOR_BODY_PREHEADER_NEW]] ]
+; CHECK-NEXT:    [[I_07:%.*]] = phi i64 [ 0, %[[FOR_BODY_PREHEADER_NEW]] ], [ [[INC_3:%.*]], %[[FOR_BODY]] ]
+; CHECK-NEXT:    [[INC_3]] = add i64 [[I_07]], 4
+; CHECK-NEXT:    [[LSR_IV_NEXT]] = add i64 [[LSR_IV]], -2
+; CHECK-NEXT:    [[NITER_NCMP_3_NOT:%.*]] = icmp eq i64 [[UNROLL_ITER]], [[INC_3]]
+; CHECK-NEXT:    br i1 [[NITER_NCMP_3_NOT]], label %[[FOR_END_LOOPEXIT_UNR_LCSSA_LOOPEXIT:.*]], label %[[FOR_BODY]]
+; CHECK:       [[FOR_END_LOOPEXIT_UNR_LCSSA_LOOPEXIT]]:
+; CHECK-NEXT:    [[LSR_IV_NEXT_LCSSA:%.*]] = phi i64 [ [[LSR_IV_NEXT]], %[[FOR_BODY]] ]
+; CHECK-NEXT:    [[TMP1:%.*]] = add i64 [[LSR_IV_NEXT]], 1
+; CHECK-NEXT:    br label %[[FOR_END_LOOPEXIT_UNR_LCSSA]]
+; CHECK:       [[FOR_END_LOOPEXIT_UNR_LCSSA]]:
+; CHECK-NEXT:    [[RES_1_LCSSA_PH:%.*]] = phi i64 [ undef, %[[FOR_BODY_PREHEADER]] ], [ [[TMP1]], %[[FOR_END_LOOPEXIT_UNR_LCSSA_LOOPEXIT]] ]
+; CHECK-NEXT:    [[RES_09_UNR:%.*]] = phi i64 [ -1, %[[FOR_BODY_PREHEADER]] ], [ [[LSR_IV_NEXT_LCSSA]], %[[FOR_END_LOOPEXIT_UNR_LCSSA_LOOPEXIT]] ]
+; CHECK-NEXT:    [[TMP2:%.*]] = and i64 [[N]], 1
+; CHECK-NEXT:    [[LCMP_MOD_NOT:%.*]] = icmp eq i64 [[TMP2]], 0
+; CHECK-NEXT:    [[SPEC_SELECT:%.*]] = select i1 [[LCMP_MOD_NOT]], i64 [[RES_1_LCSSA_PH]], i64 [[RES_09_UNR]]
+; CHECK-NEXT:    br label %[[FOR_END]]
+; CHECK:       [[FOR_END]]:
+; CHECK-NEXT:    [[RES_0_LCSSA:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[SPEC_SELECT]], %[[FOR_END_LOOPEXIT_UNR_LCSSA]] ]
+; CHECK-NEXT:    ret i64 [[RES_0_LCSSA]]
+;
+entry:
+  %mul = shl i64 %N, 1
+  %cmp6.not = icmp eq i64 %mul, 0
+  br i1 %cmp6.not, label %for.end, label %for.body.preheader
+
+for.body.preheader:
+  %0 = icmp ult i64 %mul, 4
+  br i1 %0, label %for.end.loopexit.unr-lcssa, label %for.body.preheader.new
+
+for.body.preheader.new:
+  %unroll_iter = and i64 %mul, -4
+  br label %for.body
+
+for.body:
+  %res.09 = phi i64 [ 0, %for.body.preheader.new ], [ %res.1.3, %for.body ]
+  %i.07 = phi i64 [ 0, %for.body.preheader.new ], [ %inc.3, %for.body ]
+  %niter = phi i64 [ 0, %for.body.preheader.new ], [ %niter.next.3, %for.body ]
+  %res.1.1 = add i64 %res.09, -1
+  %inc.1 = or disjoint i64 %i.07, 2
+  %res.1.2 = add i64 %inc.1, %res.1.1
+  %reass.sub = sub i64 %res.1.2, %i.07
+  %res.1.3 = add i64 %reass.sub, -3
+  %inc.3 = add nuw i64 %i.07, 4
+  %niter.next.3 = add i64 %niter, 4
+  %niter.ncmp.3.not = icmp eq i64 %niter.next.3, %unroll_iter
+  br i1 %niter.ncmp.3.not, label %for.end.loopexit.unr-lcssa.loopexit, label %for.body
+
+for.end.loopexit.unr-lcssa.loopexit:
+  %1 = add i64 %reass.sub, -4
+  br label %for.end.loopexit.unr-lcssa
+
+for.end.loopexit.unr-lcssa:
+  %res.1.lcssa.ph = phi i64 [ undef, %for.body.preheader ], [ %res.1.3, %for.end.loopexit.unr-lcssa.loopexit ]
+  %res.09.unr = phi i64 [ -1, %for.body.preheader ], [ %1, %for.end.loopexit.unr-lcssa.loopexit ]
+  %2 = and i64 %N, 1
+  %lcmp.mod.not = icmp eq i64 %2, 0
+  %spec.select = select i1 %lcmp.mod.not, i64 %res.1.lcssa.ph, i64 %res.09.unr
+  br label %for.end
+
+for.end:
+  %res.0.lcssa = phi i64 [ 0, %entry ], [ %spec.select, %for.end.loopexit.unr-lcssa ]
+  ret i64 %res.0.lcssa
+}