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