d98cb81cd1
Summary: FlattenCFG merges two 'if' basicblocks by inserting one basicblock to another basicblock. The inserted basicblock can have a successor that contains a PHI node whoes incoming basicblock is the inserted basicblock. Since the existing code does not handle it, it becomes a badref. if (cond1) statement if (cond2) statement successor - contains PHI node whose predecessor is cond2 --> if (cond1 || cond2) statement (BB for cond2 was deleted) successor - contains PHI node whose predecessor is cond2 --> bad ref! Author: Jaebaek Seo Reviewers: asbirlea, kuhar, tstellar, chandlerc, davide, dexonsmith Reviewed By: kuhar Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D68032 llvm-svn: 372989
87 lines
2.5 KiB
LLVM
87 lines
2.5 KiB
LLVM
; RUN: opt -flattencfg -S < %s | FileCheck %s
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; This test checks whether the pass completes without a crash.
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; The code is not transformed in any way
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;
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; CHECK-LABEL: @test_not_crash
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define void @test_not_crash(i32 %in_a) #0 {
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entry:
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%cmp0 = icmp eq i32 %in_a, -1
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%cmp1 = icmp ne i32 %in_a, 0
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%cond0 = and i1 %cmp0, %cmp1
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br i1 %cond0, label %b0, label %b1
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b0: ; preds = %entry
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%cmp2 = icmp eq i32 %in_a, 0
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%cmp3 = icmp ne i32 %in_a, 1
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%cond1 = or i1 %cmp2, %cmp3
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br i1 %cond1, label %exit, label %b1
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b1: ; preds = %entry, %b0
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br label %exit
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exit: ; preds = %entry, %b0, %b1
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ret void
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}
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; CHECK-LABEL: @test_not_crash2
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %0 = fcmp ult float %a
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; CHECK-NEXT: %1 = fcmp ult float %b
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; CHECK-NEXT: [[COND:%[a-z0-9]+]] = or i1 %0, %1
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; CHECK-NEXT: br i1 [[COND]], label %bb4, label %bb3
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; CHECK: bb3:
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; CHECK-NEXT: br label %bb4
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; CHECK: bb4:
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; CHECK-NEXT: ret void
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define void @test_not_crash2(float %a, float %b) #0 {
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entry:
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%0 = fcmp ult float %a, 1.000000e+00
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br i1 %0, label %bb0, label %bb1
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bb3: ; preds = %bb0
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br label %bb4
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bb4: ; preds = %bb0, %bb3
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ret void
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bb1: ; preds = %entry
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br label %bb0
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bb0: ; preds = %bb1, %entry
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%1 = fcmp ult float %b, 1.000000e+00
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br i1 %1, label %bb4, label %bb3
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}
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; CHECK-LABEL: @test_not_crash3
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %a_eq_0 = icmp eq i32 %a, 0
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; CHECK-NEXT: %a_eq_1 = icmp eq i32 %a, 1
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; CHECK-NEXT: [[COND:%[a-z0-9]+]] = or i1 %a_eq_0, %a_eq_1
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; CHECK-NEXT: br i1 [[COND]], label %bb2, label %bb3
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; CHECK: bb2:
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; CHECK-NEXT: br label %bb3
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; CHECK: bb3:
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; CHECK-NEXT: %check_badref = phi i32 [ 17, %entry ], [ 11, %bb2 ]
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; CHECK-NEXT: ret void
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define void @test_not_crash3(i32 %a) #0 {
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entry:
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%a_eq_0 = icmp eq i32 %a, 0
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br i1 %a_eq_0, label %bb0, label %bb1
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bb0: ; preds = %entry
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br label %bb1
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bb1: ; preds = %bb0, %entry
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%a_eq_1 = icmp eq i32 %a, 1
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br i1 %a_eq_1, label %bb2, label %bb3
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bb2: ; preds = %bb1
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br label %bb3
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bb3: ; preds = %bb2, %bb1
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%check_badref = phi i32 [ 17, %bb1 ], [ 11, %bb2 ]
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ret void
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}
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