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llvm-project/llvm/test/Transforms/SimplifyCFG/UnreachableEliminate.ll

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
define void @test1(i1 %C, i1* %BP) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[C:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; 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-NEXT: 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-NEXT: entry:
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[V:%.*]], 2
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[COND]], i32 2, i32 1
; CHECK-NEXT: ret i32 [[SPEC_SELECT]]
;
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-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[COND:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: store i8 2, i8* [[PTR:%.*]], align 8
; CHECK-NEXT: ret void
;
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
}
define void @test5_no_null_opt(i1 %cond, i8* %ptr) #0 {
; CHECK-LABEL: @test5_no_null_opt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[PTR_2:%.*]] = select i1 [[COND:%.*]], i8* null, i8* [[PTR:%.*]]
; CHECK-NEXT: store i8 2, i8* [[PTR_2]], align 8
; CHECK-NEXT: ret void
;
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
}
define void @test6(i1 %cond, i8* %ptr) {
; CHECK-LABEL: @test6(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[COND:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: store i8 2, i8* [[PTR:%.*]], align 8
; CHECK-NEXT: ret void
;
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
}
define void @test6_no_null_opt(i1 %cond, i8* %ptr) #0 {
; CHECK-LABEL: @test6_no_null_opt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[COND:%.*]], i8* null, i8* [[PTR:%.*]]
; CHECK-NEXT: store i8 2, i8* [[SPEC_SELECT]], align 8
; CHECK-NEXT: ret void
;
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
}
define i32 @test7(i1 %X) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[X:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: ret i32 0
;
entry:
br i1 %X, label %if, label %else
if:
call void undef()
br label %else
else:
%phi = phi i32 [ 0, %entry ], [ 1, %if ]
ret i32 %phi
}
define void @test8(i1 %X, void ()* %Y) {
; CHECK-LABEL: @test8(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[X:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: call void [[Y:%.*]]()
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi void ()* [ %Y, %entry ], [ null, %if ]
call void %phi()
ret void
}
define void @test8_no_null_opt(i1 %X, void ()* %Y) #0 {
; CHECK-LABEL: @test8_no_null_opt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], void ()* null, void ()* [[Y:%.*]]
; CHECK-NEXT: call void [[SPEC_SELECT]]()
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi void ()* [ %Y, %entry ], [ null, %if ]
call void %phi()
ret void
}
declare i8* @fn_nonnull_noundef_arg(i8* nonnull noundef %p)
declare i8* @fn_nonnull_deref_arg(i8* nonnull dereferenceable(4) %p)
declare i8* @fn_nonnull_deref_or_null_arg(i8* nonnull dereferenceable_or_null(4) %p)
declare i8* @fn_nonnull_arg(i8* nonnull %p)
declare i8* @fn_noundef_arg(i8* noundef %p)
define void @test9(i1 %X, i8* %Y) {
; CHECK-LABEL: @test9(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[X:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: [[TMP1:%.*]] = call i8* @fn_nonnull_noundef_arg(i8* [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ null, %if ]
call i8* @fn_nonnull_noundef_arg(i8* %phi)
ret void
}
; Optimizing this code should produce assume.
define void @test9_deref(i1 %X, i8* %Y) {
; CHECK-LABEL: @test9_deref(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[X:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: [[TMP1:%.*]] = call i8* @fn_nonnull_deref_arg(i8* [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ null, %if ]
call i8* @fn_nonnull_deref_arg(i8* %phi)
ret void
}
; Optimizing this code should produce assume.
define void @test9_deref_or_null(i1 %X, i8* %Y) {
; CHECK-LABEL: @test9_deref_or_null(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[X:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: [[TMP1:%.*]] = call i8* @fn_nonnull_deref_or_null_arg(i8* [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ null, %if ]
call i8* @fn_nonnull_deref_or_null_arg(i8* %phi)
ret void
}
define void @test9_undef(i1 %X, i8* %Y) {
; CHECK-LABEL: @test9_undef(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = call i8* @fn_noundef_arg(i8* [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ undef, %if ]
call i8* @fn_noundef_arg(i8* %phi)
ret void
}
define void @test9_undef_null_defined(i1 %X, i8* %Y) #0 {
; CHECK-LABEL: @test9_undef_null_defined(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = call i8* @fn_noundef_arg(i8* [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ undef, %if ]
call i8* @fn_noundef_arg(i8* %phi)
ret void
}
define void @test9_null_callsite(i1 %X, i8* %Y) {
; CHECK-LABEL: @test9_null_callsite(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[X:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: [[TMP1:%.*]] = call i8* @fn_nonnull_arg(i8* noundef nonnull [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ null, %if ]
call i8* @fn_nonnull_arg(i8* nonnull noundef %phi)
ret void
}
define void @test9_gep_mismatch(i1 %X, i8* %Y, i8* %P) {
; CHECK-LABEL: @test9_gep_mismatch(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], i8* null, i8* [[Y:%.*]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8* [[P:%.*]], i64 0
; CHECK-NEXT: [[TMP0:%.*]] = call i8* @fn_nonnull_noundef_arg(i8* [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ null, %if ]
%gep = getelementptr inbounds i8, i8* %P, i64 0
call i8* @fn_nonnull_noundef_arg(i8* %gep)
ret void
}
define void @test9_gep_zero(i1 %X, i8* %Y) {
; CHECK-LABEL: @test9_gep_zero(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[X:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8* [[Y:%.*]], i64 0
; CHECK-NEXT: [[TMP1:%.*]] = call i8* @fn_nonnull_noundef_arg(i8* [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ null, %if ]
%gep = getelementptr inbounds i8, i8* %phi, i64 0
call i8* @fn_nonnull_noundef_arg(i8* %gep)
ret void
}
define void @test9_gep_bitcast(i1 %X, i32* %Y) {
; CHECK-LABEL: @test9_gep_bitcast(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[X:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, i32* [[Y:%.*]], i64 0
; CHECK-NEXT: [[BC:%.*]] = bitcast i32* [[GEP]] to i8*
; CHECK-NEXT: [[TMP1:%.*]] = call i8* @fn_nonnull_noundef_arg(i8* [[BC]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i32* [ %Y, %entry ], [ null, %if ]
%gep = getelementptr inbounds i32, i32* %phi, i64 0
%bc = bitcast i32* %gep to i8*
call i8* @fn_nonnull_noundef_arg(i8* %bc)
ret void
}
define void @test9_gep_nonzero(i1 %X, i8* %Y) {
; CHECK-LABEL: @test9_gep_nonzero(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], i8* null, i8* [[Y:%.*]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, i8* [[SPEC_SELECT]], i64 12
; CHECK-NEXT: [[TMP0:%.*]] = call i8* @fn_nonnull_noundef_arg(i8* [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ null, %if ]
%gep = getelementptr i8, i8* %phi, i64 12
call i8* @fn_nonnull_noundef_arg(i8* %gep)
ret void
}
define void @test9_gep_inbounds_nonzero(i1 %X, i8* %Y) {
; CHECK-LABEL: @test9_gep_inbounds_nonzero(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], i8* null, i8* [[Y:%.*]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8* [[SPEC_SELECT]], i64 12
; CHECK-NEXT: [[TMP0:%.*]] = call i8* @fn_nonnull_noundef_arg(i8* [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ null, %if ]
%gep = getelementptr inbounds i8, i8* %phi, i64 12
call i8* @fn_nonnull_noundef_arg(i8* %gep)
ret void
}
define void @test9_gep_inbouds_unknown_null(i1 %X, i8* %Y, i64 %I) {
; CHECK-LABEL: @test9_gep_inbouds_unknown_null(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], i8* null, i8* [[Y:%.*]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8* [[SPEC_SELECT]], i64 [[I:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = call i8* @fn_nonnull_noundef_arg(i8* [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ null, %if ]
%gep = getelementptr inbounds i8, i8* %phi, i64 %I
call i8* @fn_nonnull_noundef_arg(i8* %gep)
ret void
}
define void @test9_gep_unknown_null(i1 %X, i8* %Y, i64 %I) {
; CHECK-LABEL: @test9_gep_unknown_null(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], i8* null, i8* [[Y:%.*]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, i8* [[SPEC_SELECT]], i64 [[I:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = call i8* @fn_nonnull_noundef_arg(i8* [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ null, %if ]
%gep = getelementptr i8, i8* %phi, i64 %I
call i8* @fn_nonnull_noundef_arg(i8* %gep)
ret void
}
define void @test9_gep_unknown_undef(i1 %X, i8* %Y, i64 %I) {
; CHECK-LABEL: @test9_gep_unknown_undef(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, i8* [[Y:%.*]], i64 [[I:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = call i8* @fn_noundef_arg(i8* [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ undef, %if ]
%gep = getelementptr i8, i8* %phi, i64 %I
call i8* @fn_noundef_arg(i8* %gep)
ret void
}
define void @test9_missing_noundef(i1 %X, i8* %Y) {
; CHECK-LABEL: @test9_missing_noundef(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], i8* null, i8* [[Y:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = call i8* @fn_nonnull_arg(i8* [[SPEC_SELECT]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ null, %if ]
call i8* @fn_nonnull_arg(i8* %phi)
ret void
}
define void @test9_null_defined(i1 %X, i8* %Y) #0 {
; CHECK-LABEL: @test9_null_defined(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], i8* null, i8* [[Y:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = call i8* @fn_nonnull_noundef_arg(i8* [[SPEC_SELECT]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi i8* [ %Y, %entry ], [ null, %if ]
call i8* @fn_nonnull_noundef_arg(i8* %phi)
ret void
}
attributes #0 = { null_pointer_is_valid }
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