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always add an unreachable branch on matches to give more info to llvm about which values are possible

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Djzin 2017-11-07 00:07:32 +00:00
parent 9b53f0a662
commit 829b70330e
3 changed files with 42 additions and 31 deletions
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9
src/test/codegen/match.rs
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@ -21,12 +21,15 @@ pub enum E {
#[no_mangle]
pub fn exhaustive_match(e: E) {
// CHECK: switch{{.*}}, label %[[OTHERWISE:[a-zA-Z0-9_]+]] [
// CHECK-NEXT: i[[TY:[0-9]+]] [[DISCR:[0-9]+]], label %[[TRUE:[a-zA-Z0-9_]+]]
// CHECK-NEXT: i[[TY:[0-9]+]] [[DISCR:[0-9]+]], label %[[A:[a-zA-Z0-9_]+]]
// CHECK-NEXT: i[[TY:[0-9]+]] [[DISCR:[0-9]+]], label %[[B:[a-zA-Z0-9_]+]]
// CHECK-NEXT: ]
// CHECK: [[TRUE]]:
// CHECK: [[A]]:
// CHECK-NEXT: br label %[[EXIT:[a-zA-Z0-9_]+]]
// CHECK: [[B]]:
// CHECK-NEXT: br label %[[EXIT:[a-zA-Z0-9_]+]]
// CHECK: [[OTHERWISE]]:
// CHECK-NEXT: br label %[[EXIT:[a-zA-Z0-9_]+]]
// CHECK-NEXT: unreachable
match e {
E::A => (),
E::B => (),