forked from OSchip/llvm-project
81 lines
2.4 KiB
LLVM
81 lines
2.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -newgvn -S %s | FileCheck %s
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; Test cases to make sure the blocks are properly marked as executable, if the
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; state of the branch condition changes.
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; Test case to make sure the case where a condition cannot be simplified is
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; handled properly.
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define i1 @test1() {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CALL:%.*]] = tail call i1 @foo()
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; CHECK-NEXT: br i1 [[CALL]], label [[THEN:%.*]], label [[ELSE:%.*]]
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; CHECK: then:
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; CHECK-NEXT: ret i1 true
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; CHECK: else:
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; CHECK-NEXT: ret i1 false
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;
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entry:
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%call = tail call i1 @foo()
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br i1 %call, label %then, label %else
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then:
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ret i1 true
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else:
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ret i1 false
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}
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declare i1 @foo()
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; Make sure state changes are propagated across freeze to branches.
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define void @test2(i1 %c) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
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; CHECK: loop.header:
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; CHECK-NEXT: [[P_0:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[LOOP_LATCH:%.*]] ]
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; CHECK-NEXT: [[P_1:%.*]] = phi i32 [ 1, [[ENTRY]] ], [ [[P_2:%.*]], [[LOOP_LATCH]] ]
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; CHECK-NEXT: br label [[LOOP_BB_1:%.*]]
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; CHECK: loop.bb.1:
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; CHECK-NEXT: [[INC]] = add nsw i32 [[P_0]], 1
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; CHECK-NEXT: [[C_1:%.*]] = icmp slt i32 [[P_0]], 0
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; CHECK-NEXT: [[C_1_FREEZE:%.*]] = freeze i1 [[C_1]]
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; CHECK-NEXT: br i1 [[C_1_FREEZE]], label [[LOOP_BB_2:%.*]], label [[LOOP_LATCH]]
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; CHECK: loop.bb.2:
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; CHECK-NEXT: br label [[LOOP_LATCH]]
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; CHECK: loop.latch:
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; CHECK-NEXT: [[P_2]] = phi i32 [ 0, [[LOOP_BB_2]] ], [ [[P_1]], [[LOOP_BB_1]] ]
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; CHECK-NEXT: [[C_2:%.*]] = icmp eq i32 [[P_2]], 123
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; CHECK-NEXT: br i1 [[C_2]], label [[EXIT:%.*]], label [[LOOP_HEADER]]
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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.header
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loop.header:
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%p.0 = phi i32 [ 0, %entry ], [ %p.3, %loop.latch ]
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%p.1 = phi i32 [ 1, %entry ], [ %p.2, %loop.latch ]
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br label %loop.bb.1
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loop.bb.1:
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%inc = add nsw i32 %p.0, 1
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%c.1 = icmp slt i32 %p.0, 0
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%c.1.freeze = freeze i1 %c.1
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br i1 %c.1.freeze, label %loop.bb.2, label %loop.latch
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loop.bb.2:
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br label %loop.latch
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loop.latch:
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%p.2 = phi i32 [ 0, %loop.bb.2 ], [ %p.1, %loop.bb.1 ]
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%p.3 = phi i32 [ %inc, %loop.bb.2 ], [ %inc, %loop.bb.1 ]
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%c.2 = icmp eq i32 %p.2, 123
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br i1 %c.2, label %exit, label %loop.header
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exit:
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ret void
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}
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