llvm-6502/test/Transforms/SimplifyCFG/UnreachableEliminate.ll
David Majnemer cc714e2142 Move the personality function from LandingPadInst to Function
The personality routine currently lives in the LandingPadInst.

This isn't desirable because:
- All LandingPadInsts in the same function must have the same
  personality routine.  This means that each LandingPadInst beyond the
  first has an operand which produces no additional information.

- There is ongoing work to introduce EH IR constructs other than
  LandingPadInst.  Moving the personality routine off of any one
  particular Instruction and onto the parent function seems a lot better
  than have N different places a personality function can sneak onto an
  exceptional function.

Differential Revision: http://reviews.llvm.org/D10429

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239940 91177308-0d34-0410-b5e6-96231b3b80d8
2015-06-17 20:52:32 +00:00

99 lines
1.8 KiB
LLVM

; RUN: opt < %s -simplifycfg -S | FileCheck %s
define void @test1(i1 %C, i1* %BP) {
; CHECK-LABEL: @test1(
; CHECK: entry:
; CHECK-NEXT: ret void
entry:
br i1 %C, label %T, label %F
T:
store i1 %C, i1* %BP
unreachable
F:
ret void
}
define void @test2() personality i32 (...)* @__gxx_personality_v0 {
; CHECK-LABEL: @test2(
; CHECK: entry:
; CHECK-NEXT: call void @test2()
; CHECK-NEXT: ret void
entry:
invoke void @test2( )
to label %N unwind label %U
U:
%res = landingpad { i8* }
cleanup
unreachable
N:
ret void
}
declare i32 @__gxx_personality_v0(...)
define i32 @test3(i32 %v) {
; CHECK-LABEL: @test3(
; CHECK: entry:
; CHECK-NEXT: [[CMP:%[A-Za-z0-9]+]] = icmp eq i32 %v, 2
; CHECK-NEXT: select i1 [[CMP]], i32 2, i32 1
; CHECK-NEXT: ret
entry:
switch i32 %v, label %default [
i32 1, label %U
i32 2, label %T
]
default:
ret i32 1
U:
unreachable
T:
ret i32 2
}
;; We can either convert the following control-flow to a select or remove the
;; unreachable control flow because of the undef store of null. Make sure we do
;; the latter.
define void @test5(i1 %cond, i8* %ptr) {
; CHECK-LABEL: test5
; CHECK: entry:
; CHECK-NOT: select
; CHECK: store i8 2, i8* %ptr
; CHECK: ret
entry:
br i1 %cond, label %bb1, label %bb3
bb3:
br label %bb2
bb1:
br label %bb2
bb2:
%ptr.2 = phi i8* [ %ptr, %bb3 ], [ null, %bb1 ]
store i8 2, i8* %ptr.2, align 8
ret void
}
; CHECK-LABEL: test6
; CHECK: entry:
; CHECK-NOT: select
; CHECK: store i8 2, i8* %ptr
; CHECK: ret
define void @test6(i1 %cond, i8* %ptr) {
entry:
br i1 %cond, label %bb1, label %bb2
bb1:
br label %bb2
bb2:
%ptr.2 = phi i8* [ %ptr, %entry ], [ null, %bb1 ]
store i8 2, i8* %ptr.2, align 8
ret void
}