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79 lines
1.6 KiB
LLVM
79 lines
1.6 KiB
LLVM
; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | not grep 'call void %DEAD'
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; Test that we can thread a simple known condition through switch statements.
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declare void %foo1()
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declare void %foo2()
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declare void %DEAD()
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void %test1(uint %V) {
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switch uint %V, label %A [
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uint 4, label %T
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uint 17, label %Done
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uint 1234, label %A
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]
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T: ;; V == 4 if we get here.
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call void %foo1()
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;; This switch is always statically determined.
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switch uint %V, label %A2 [
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uint 4, label %B
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uint 17, label %C
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uint 42, label %C
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]
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A2:
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call void %DEAD()
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call void %DEAD()
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%cond2 = seteq uint %V, 4 ;; always false
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br bool %cond2, label %Done, label %C
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A:
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call void %foo1()
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%cond = setne uint %V, 4 ;; always true
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br bool %cond, label %Done, label %C
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Done:
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ret void
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B:
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call void %foo2()
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%cond3 = seteq uint %V, 4 ;; always true
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br bool %cond3, label %Done, label %C
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C:
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call void %DEAD()
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ret void
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}
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void %test2(uint %V) {
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switch uint %V, label %A [
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uint 4, label %T
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uint 17, label %D
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uint 1234, label %E
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]
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A: ;; V != 4, 17, 1234 here.
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call void %foo1()
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;; This switch is always statically determined.
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switch uint %V, label %E [
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uint 4, label %C
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uint 17, label %C
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uint 42, label %D
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]
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C:
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call void %DEAD() ;; unreacahble.
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ret void
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T:
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call void %foo1()
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call void %foo1()
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ret void
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D:
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call void %foo1()
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ret void
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E:
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ret void
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}
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