forked from OSchip/llvm-project
[InstCombine] Add the test that triggered the D60846 revert
This is in preparation of D69571.
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@ -91,3 +91,45 @@ exit:
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%res = phi <8 x i64> [ %ctz, %non_zero ], [ zeroinitializer, %start ]
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ret <8 x i64> %res
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}
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; Test that exposed a bug in the PHI handling after D60846. No folding should happen here!
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define void @D60846_misompile(i1* %p) {
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; CHECK-LABEL: @D60846_misompile(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[I:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[I_INC:%.*]], [[COMMON:%.*]] ]
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; CHECK-NEXT: [[IS_ZERO:%.*]] = icmp eq i16 [[I]], 0
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; CHECK-NEXT: br i1 [[IS_ZERO]], label [[COMMON]], label [[NON_ZERO:%.*]]
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; CHECK: non_zero:
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; CHECK-NEXT: [[IS_ONE:%.*]] = icmp eq i16 [[I]], 1
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; CHECK-NEXT: store i1 [[IS_ONE]], i1* [[P:%.*]], align 1
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; CHECK-NEXT: br label [[COMMON]]
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; CHECK: common:
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; CHECK-NEXT: [[I_INC]] = add i16 [[I]], 1
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; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ult i16 [[I_INC]], 2
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; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT:%.*]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %loop
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loop: ; preds = %common, %entry
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%i = phi i16 [ 0, %entry ], [ %i.inc, %common ]
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%is_zero = icmp eq i16 %i, 0
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br i1 %is_zero, label %common, label %non_zero
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non_zero: ; preds = %loop
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%is_one = icmp eq i16 %i, 1
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store i1 %is_one, i1* %p
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br label %common
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common: ; preds = %non_zero, %loop
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%i.inc = add i16 %i, 1
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%loop_cond = icmp ult i16 %i.inc, 2
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br i1 %loop_cond, label %loop, label %exit
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exit: ; preds = %common
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ret void
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}
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