callbr-loadpre-critedge.ll
2.1 KB
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -gvn -S | FileCheck %s
; This test checks that we don't hang trying to split a critical edge in loadpre
; when the control flow uses a callbr instruction.
%struct.pluto = type <{ i8, i8 }>
define void @widget(%struct.pluto** %tmp1) {
; CHECK-LABEL: @widget(
; CHECK-NEXT: bb:
; CHECK-NEXT: callbr void asm sideeffect "", "X,X"(i8* blockaddress(@widget, [[BB5:%.*]]), i8* blockaddress(@widget, [[BB8:%.*]]))
; CHECK-NEXT: to label [[BB4:%.*]] [label [[BB5]], label %bb8]
; CHECK: bb4:
; CHECK-NEXT: br label [[BB5]]
; CHECK: bb5:
; CHECK-NEXT: [[TMP6:%.*]] = load %struct.pluto*, %struct.pluto** [[TMP1:%.*]]
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds [[STRUCT_PLUTO:%.*]], %struct.pluto* [[TMP6]], i64 0, i32 1
; CHECK-NEXT: br label [[BB8]]
; CHECK: bb8:
; CHECK-NEXT: [[TMP9:%.*]] = phi i8* [ [[TMP7]], [[BB5]] ], [ null, [[BB:%.*]] ]
; CHECK-NEXT: [[TMP10:%.*]] = load %struct.pluto*, %struct.pluto** [[TMP1]]
; CHECK-NEXT: [[TMP11:%.*]] = getelementptr inbounds [[STRUCT_PLUTO]], %struct.pluto* [[TMP10]], i64 0, i32 0
; CHECK-NEXT: [[TMP12:%.*]] = load i8, i8* [[TMP11]]
; CHECK-NEXT: tail call void @spam(i8* [[TMP9]], i8 [[TMP12]])
; CHECK-NEXT: ret void
;
bb:
callbr void asm sideeffect "", "X,X"(i8* blockaddress(@widget, %bb5), i8* blockaddress(@widget, %bb8))
to label %bb4 [label %bb5, label %bb8]
bb4: ; preds = %bb
br label %bb5
bb5: ; preds = %bb4, %bb
%tmp6 = load %struct.pluto*, %struct.pluto** %tmp1
%tmp7 = getelementptr inbounds %struct.pluto, %struct.pluto* %tmp6, i64 0, i32 1
br label %bb8
bb8: ; preds = %bb5, %bb
%tmp9 = phi i8* [ %tmp7, %bb5 ], [ null, %bb ]
%tmp10 = load %struct.pluto*, %struct.pluto** %tmp1
%tmp11 = getelementptr inbounds %struct.pluto, %struct.pluto* %tmp10, i64 0, i32 0
%tmp12 = load i8, i8* %tmp11
tail call void @spam(i8* %tmp9, i8 %tmp12)
ret void
}
declare void @spam(i8*, i8)