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; RUN: opt %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
declare i32 @f(i32)
define i32 @basic(i32 %x) {
; CHECK-LABEL: @basic
; CHECK-LABEL: entry:
; CHECK-NEXT: call i32 @f(i32 0)
; CHECK-NEXT: ret i32 %0
entry:
switch i32 %x, label %default [
i32 5, label %default
i32 6, label %default
i32 7, label %default
]
default:
%0 = call i32 @f(i32 0)
ret i32 %0
}
define i32 @constant() {
; CHECK-LABEL: @constant
; CHECK-LABEL: entry:
; CHECK-NEXT: call i32 @f(i32 1)
; CHECK-NEXT: ret i32 %0
entry:
switch i32 42, label %default [
i32 41, label %default
i32 42, label %a
i32 43, label %b
]
default:
%0 = call i32 @f(i32 0)
ret i32 %0
a:
%1 = call i32 @f(i32 1)
ret i32 %1
b:
%2 = call i32 @f(i32 2)
ret i32 %2
}
define i32 @unreachable(i32 %x) {
; CHECK-LABEL: @unreachable
; CHECK-LABEL: entry:
; CHECK-NEXT: call i32 @f(i32 0)
; CHECK-NEXT: ret i32 %0
entry:
switch i32 %x, label %unreachable [
i32 5, label %a
i32 6, label %a
i32 7, label %a
]
unreachable:
unreachable
a:
%0 = call i32 @f(i32 0)
ret i32 %0
}
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