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Although empty blocks are cleaned up at the end of every Simplification pass, it's not legal SIL to have empty blocks and subsequent simplification passes may crash because of this. rdar://115169880
29 lines
747 B
Plaintext
29 lines
747 B
Plaintext
// RUN: %target-sil-opt -enable-sil-verify-all %s -sil-opt-pass-count=1.1 -simplification -simplify-instruction=br | %FileCheck %s
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// REQUIRES: swift_in_compiler
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import Swift
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import Builtin
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// Check that branch simplification doesn't leave empty blocks.
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// -sil-opt-pass-count=1.1 prevents dead block elimination which would hide the problem.
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// CHECK-LABEL: sil @dont_leave_empty_blocks
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// CHECK: bb0(%0 : $Builtin.Int64):
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// CHECK-NEXT: br bb1
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// CHECK: bb1:
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// CHECK-NEXT: return %0
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// CHECK: } // end sil function 'dont_leave_empty_blocks'
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sil @dont_leave_empty_blocks : $@convention(thin) (Builtin.Int64) -> Builtin.Int64 {
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bb0(%0 : $Builtin.Int64):
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br bb1
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bb1:
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br bb2
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bb2:
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return %0 : $Builtin.Int64
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}
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