basic.ll
2.06 KB
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; RUN: opt < %s -indirectbr-expand -S | FileCheck %s
;
; REQUIRES: x86-registered-target
target triple = "x86_64-unknown-linux-gnu"
@test1.targets = constant [4 x i8*] [i8* blockaddress(@test1, %bb0),
i8* blockaddress(@test1, %bb1),
i8* blockaddress(@test1, %bb2),
i8* blockaddress(@test1, %bb3)]
; CHECK-LABEL: @test1.targets = constant [4 x i8*]
; CHECK: [i8* inttoptr (i64 1 to i8*),
; CHECK: i8* inttoptr (i64 2 to i8*),
; CHECK: i8* inttoptr (i64 3 to i8*),
; CHECK: i8* blockaddress(@test1, %bb3)]
define void @test1(i64* readonly %p, i64* %sink) #0 {
; CHECK-LABEL: define void @test1(
entry:
%i0 = load i64, i64* %p
%target.i0 = getelementptr [4 x i8*], [4 x i8*]* @test1.targets, i64 0, i64 %i0
%target0 = load i8*, i8** %target.i0
; Only a subset of blocks are viable successors here.
indirectbr i8* %target0, [label %bb0, label %bb1]
; CHECK-NOT: indirectbr
; CHECK: %[[ENTRY_V:.*]] = ptrtoint i8* %{{.*}} to i64
; CHECK-NEXT: br label %[[SWITCH_BB:.*]]
bb0:
store volatile i64 0, i64* %sink
br label %latch
bb1:
store volatile i64 1, i64* %sink
br label %latch
bb2:
store volatile i64 2, i64* %sink
br label %latch
bb3:
store volatile i64 3, i64* %sink
br label %latch
latch:
%i.next = load i64, i64* %p
%target.i.next = getelementptr [4 x i8*], [4 x i8*]* @test1.targets, i64 0, i64 %i.next
%target.next = load i8*, i8** %target.i.next
; A different subset of blocks are viable successors here.
indirectbr i8* %target.next, [label %bb1, label %bb2]
; CHECK-NOT: indirectbr
; CHECK: %[[LATCH_V:.*]] = ptrtoint i8* %{{.*}} to i64
; CHECK-NEXT: br label %[[SWITCH_BB]]
;
; CHECK: [[SWITCH_BB]]:
; CHECK-NEXT: %[[V:.*]] = phi i64 [ %[[ENTRY_V]], %entry ], [ %[[LATCH_V]], %latch ]
; CHECK-NEXT: switch i64 %[[V]], label %bb0 [
; CHECK-NEXT: i64 2, label %bb1
; CHECK-NEXT: i64 3, label %bb2
; CHECK-NEXT: ]
}
attributes #0 = { "target-features"="+retpoline" }