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Copy pathUnreachableEliminate.ll
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UnreachableEliminate.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals
; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
define void @test1(i1 %C, ptr %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, ptr %BP
unreachable
F:
ret void
}
define void @test2() personality ptr @__gxx_personality_v0 {
; CHECK-LABEL: @test2(
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @test2() #[[ATTR4:[0-9]+]]
; CHECK-NEXT: ret void
;
entry:
invoke void @test2( )
to label %N unwind label %U
U:
%res = landingpad { ptr }
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, ptr %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, ptr [[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 ptr [ %ptr, %bb3 ], [ null, %bb1 ]
store i8 2, ptr %ptr.2, align 8
ret void
}
declare void @llvm.assume(i1)
declare i1 @llvm.type.test(ptr, metadata) nounwind readnone
;; Same as the above test but make sure the unreachable control flow is still
;; removed in the presence of a type test / assume sequence.
define void @test5_type_test_assume(i1 %cond, ptr %ptr, ptr %vtable) {
; CHECK-LABEL: @test5_type_test_assume(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[COND:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: [[P:%.*]] = call i1 @llvm.type.test(ptr [[VTABLE:%.*]], metadata !"foo")
; CHECK-NEXT: tail call void @llvm.assume(i1 [[P]])
; CHECK-NEXT: store i8 2, ptr [[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 ptr [ %ptr, %bb3 ], [ null, %bb1 ]
%p = call i1 @llvm.type.test(ptr %vtable, metadata !"foo")
tail call void @llvm.assume(i1 %p)
store i8 2, ptr %ptr.2, align 8
ret void
}
define void @test5_no_null_opt(i1 %cond, ptr %ptr) #0 {
; CHECK-LABEL: @test5_no_null_opt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[DOTPTR:%.*]] = select i1 [[COND:%.*]], ptr null, ptr [[PTR:%.*]]
; CHECK-NEXT: store i8 2, ptr [[DOTPTR]], 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 ptr [ %ptr, %bb3 ], [ null, %bb1 ]
store i8 2, ptr %ptr.2, align 8
ret void
}
define void @test6(i1 %cond, ptr %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, ptr [[PTR:%.*]], align 8
; CHECK-NEXT: ret void
;
entry:
br i1 %cond, label %bb1, label %bb2
bb1:
br label %bb2
bb2:
%ptr.2 = phi ptr [ %ptr, %entry ], [ null, %bb1 ]
store i8 2, ptr %ptr.2, align 8
ret void
}
define void @test6_no_null_opt(i1 %cond, ptr %ptr) #0 {
; CHECK-LABEL: @test6_no_null_opt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[COND:%.*]], ptr null, ptr [[PTR:%.*]]
; CHECK-NEXT: store i8 2, ptr [[SPEC_SELECT]], align 8
; CHECK-NEXT: ret void
;
entry:
br i1 %cond, label %bb1, label %bb2
bb1:
br label %bb2
bb2:
%ptr.2 = phi ptr [ %ptr, %entry ], [ null, %bb1 ]
store i8 2, ptr %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, ptr %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 ptr [ %Y, %entry ], [ null, %if ]
call void %phi()
ret void
}
define void @test8_no_null_opt(i1 %X, ptr %Y) #0 {
; CHECK-LABEL: @test8_no_null_opt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], ptr null, ptr [[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 ptr [ %Y, %entry ], [ null, %if ]
call void %phi()
ret void
}
declare ptr @fn_nonnull_noundef_arg(ptr nonnull noundef %p)
declare ptr @fn_nonnull_deref_arg(ptr nonnull dereferenceable(4) %p)
declare ptr @fn_nonnull_deref_or_null_arg(ptr nonnull dereferenceable_or_null(4) %p)
declare ptr @fn_nonnull_arg(ptr nonnull %p)
declare ptr @fn_noundef_arg(ptr noundef %p)
declare ptr @fn_ptr_arg(ptr)
declare ptr @fn_ptr_arg_nounwind_willreturn(ptr) nounwind willreturn
define void @test9(i1 %X, ptr %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 ptr @fn_nonnull_noundef_arg(ptr [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
call ptr @fn_nonnull_noundef_arg(ptr %phi)
ret void
}
; Optimizing this code should produce assume.
define void @test9_deref(i1 %X, ptr %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 ptr @fn_nonnull_deref_arg(ptr [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
call ptr @fn_nonnull_deref_arg(ptr %phi)
ret void
}
; Optimizing this code should produce assume.
define void @test9_deref_or_null(i1 %X, ptr %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 ptr @fn_nonnull_deref_or_null_arg(ptr [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
call ptr @fn_nonnull_deref_or_null_arg(ptr %phi)
ret void
}
define void @test9_undef(i1 %X, ptr %Y) {
; CHECK-LABEL: @test9_undef(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = call ptr @fn_noundef_arg(ptr [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ undef, %if ]
call ptr @fn_noundef_arg(ptr %phi)
ret void
}
define void @test9_undef_null_defined(i1 %X, ptr %Y) #0 {
; CHECK-LABEL: @test9_undef_null_defined(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = call ptr @fn_noundef_arg(ptr [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ undef, %if ]
call ptr @fn_noundef_arg(ptr %phi)
ret void
}
define void @test9_null_callsite(i1 %X, ptr %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 ptr @fn_nonnull_arg(ptr noundef nonnull [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
call ptr @fn_nonnull_arg(ptr nonnull noundef %phi)
ret void
}
define void @test9_gep_mismatch(i1 %X, ptr %Y, ptr %P) {
; CHECK-LABEL: @test9_gep_mismatch(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], ptr null, ptr [[Y:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = call ptr @fn_nonnull_noundef_arg(ptr [[P:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
call ptr @fn_nonnull_noundef_arg(ptr %P)
ret void
}
define void @test9_gep_zero(i1 %X, ptr %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: [[TMP1:%.*]] = call ptr @fn_nonnull_noundef_arg(ptr [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
call ptr @fn_nonnull_noundef_arg(ptr %phi)
ret void
}
define void @test9_gep_bitcast(i1 %X, ptr %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: [[TMP1:%.*]] = call ptr @fn_nonnull_noundef_arg(ptr [[Y:%.*]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
call ptr @fn_nonnull_noundef_arg(ptr %phi)
ret void
}
define void @test9_gep_nonzero(i1 %X, ptr %Y) {
; CHECK-LABEL: @test9_gep_nonzero(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], ptr null, ptr [[Y:%.*]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, ptr [[SPEC_SELECT]], i64 12
; CHECK-NEXT: [[TMP0:%.*]] = call ptr @fn_nonnull_noundef_arg(ptr [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
%gep = getelementptr i8, ptr %phi, i64 12
call ptr @fn_nonnull_noundef_arg(ptr %gep)
ret void
}
define void @test9_gep_inbounds_nonzero(i1 %X, ptr %Y) {
; CHECK-LABEL: @test9_gep_inbounds_nonzero(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[X:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, ptr [[Y:%.*]], i64 12
; CHECK-NEXT: [[TMP1:%.*]] = call ptr @fn_nonnull_noundef_arg(ptr [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
%gep = getelementptr inbounds i8, ptr %phi, i64 12
call ptr @fn_nonnull_noundef_arg(ptr %gep)
ret void
}
define void @test9_gep_inbounds_nonzero_null_defined(i1 %X, ptr %Y) #0 {
; CHECK-LABEL: @test9_gep_inbounds_nonzero_null_defined(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], ptr null, ptr [[Y:%.*]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, ptr [[SPEC_SELECT]], i64 12
; CHECK-NEXT: [[TMP0:%.*]] = call ptr @fn_nonnull_noundef_arg(ptr [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
%gep = getelementptr inbounds i8, ptr %phi, i64 12
call ptr @fn_nonnull_noundef_arg(ptr %gep)
ret void
}
define void @test9_gep_inbounds_unknown_null(i1 %X, ptr %Y, i64 %I) {
; CHECK-LABEL: @test9_gep_inbounds_unknown_null(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[X:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, ptr [[Y:%.*]], i64 [[I:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = call ptr @fn_nonnull_noundef_arg(ptr [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
%gep = getelementptr inbounds i8, ptr %phi, i64 %I
call ptr @fn_nonnull_noundef_arg(ptr %gep)
ret void
}
define void @test9_gep_inbounds_unknown_null_defined(i1 %X, ptr %Y, i64 %I) #0 {
; CHECK-LABEL: @test9_gep_inbounds_unknown_null_defined(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], ptr null, ptr [[Y:%.*]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, ptr [[SPEC_SELECT]], i64 [[I:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = call ptr @fn_nonnull_noundef_arg(ptr [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
%gep = getelementptr inbounds i8, ptr %phi, i64 %I
call ptr @fn_nonnull_noundef_arg(ptr %gep)
ret void
}
define void @test9_gep_inbounds_unknown_null_call_noundef(i1 %X, ptr %Y, i64 %I) {
; CHECK-LABEL: @test9_gep_inbounds_unknown_null_call_noundef(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], ptr null, ptr [[Y:%.*]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, ptr [[SPEC_SELECT]], i64 [[I:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = call ptr @fn_noundef_arg(ptr [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
%gep = getelementptr inbounds i8, ptr %phi, i64 %I
call ptr @fn_noundef_arg(ptr %gep)
ret void
}
define void @test9_gep_unknown_null(i1 %X, ptr %Y, i64 %I) {
; CHECK-LABEL: @test9_gep_unknown_null(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], ptr null, ptr [[Y:%.*]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, ptr [[SPEC_SELECT]], i64 [[I:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = call ptr @fn_nonnull_noundef_arg(ptr [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
%gep = getelementptr i8, ptr %phi, i64 %I
call ptr @fn_nonnull_noundef_arg(ptr %gep)
ret void
}
define void @test9_gep_unknown_undef(i1 %X, ptr %Y, i64 %I) {
; CHECK-LABEL: @test9_gep_unknown_undef(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, ptr [[Y:%.*]], i64 [[I:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = call ptr @fn_noundef_arg(ptr [[GEP]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ undef, %if ]
%gep = getelementptr i8, ptr %phi, i64 %I
call ptr @fn_noundef_arg(ptr %gep)
ret void
}
define void @test9_missing_noundef(i1 %X, ptr %Y) {
; CHECK-LABEL: @test9_missing_noundef(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], ptr null, ptr [[Y:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = call ptr @fn_nonnull_arg(ptr [[SPEC_SELECT]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
call ptr @fn_nonnull_arg(ptr %phi)
ret void
}
define void @test9_null_defined(i1 %X, ptr %Y) #0 {
; CHECK-LABEL: @test9_null_defined(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], ptr null, ptr [[Y:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = call ptr @fn_nonnull_noundef_arg(ptr [[SPEC_SELECT]])
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi ptr [ %Y, %entry ], [ null, %if ]
call ptr @fn_nonnull_noundef_arg(ptr %phi)
ret void
}
define i32 @test_assume_false(i32 %cond) {
; CHECK-LABEL: @test_assume_false(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i32 [[COND:%.*]], label [[DEFAULT:%.*]] [
; CHECK-NEXT: i32 0, label [[EXIT:%.*]]
; CHECK-NEXT: i32 1, label [[CASE1:%.*]]
; CHECK-NEXT: i32 2, label [[CASE2:%.*]]
; CHECK-NEXT: ]
; CHECK: case1:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: case2:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: default:
; CHECK-NEXT: unreachable
; CHECK: exit:
; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 2, [[CASE1]] ], [ 3, [[CASE2]] ], [ 1, [[ENTRY:%.*]] ]
; CHECK-NEXT: call void @llvm.assume(i1 true)
; CHECK-NEXT: ret i32 [[RES]]
;
entry:
switch i32 %cond, label %default [
i32 0, label %case0
i32 1, label %case1
i32 2, label %case2
]
case0:
br label %exit
case1:
br label %exit
case2:
br label %exit
default:
br label %exit
exit:
%bool = phi i1 [ false, %default ], [ true, %case0 ], [ true, %case1 ], [ true, %case2 ]
%res = phi i32 [ 0, %default ], [ 1, %case0 ], [ 2, %case1 ], [ 3, %case2 ]
call void @llvm.assume(i1 %bool)
ret i32 %res
}
define i32 @test_assume_undef(i32 %cond) {
; CHECK-LABEL: @test_assume_undef(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i32 [[COND:%.*]], label [[DEFAULT:%.*]] [
; CHECK-NEXT: i32 0, label [[EXIT:%.*]]
; CHECK-NEXT: i32 1, label [[CASE1:%.*]]
; CHECK-NEXT: i32 2, label [[CASE2:%.*]]
; CHECK-NEXT: ]
; CHECK: case1:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: case2:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: default:
; CHECK-NEXT: unreachable
; CHECK: exit:
; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 2, [[CASE1]] ], [ 3, [[CASE2]] ], [ 1, [[ENTRY:%.*]] ]
; CHECK-NEXT: call void @llvm.assume(i1 true)
; CHECK-NEXT: ret i32 [[RES]]
;
entry:
switch i32 %cond, label %default [
i32 0, label %case0
i32 1, label %case1
i32 2, label %case2
]
case0:
br label %exit
case1:
br label %exit
case2:
br label %exit
default:
br label %exit
exit:
%bool = phi i1 [ undef, %default ], [ true, %case0 ], [ true, %case1 ], [ true, %case2 ]
%res = phi i32 [ 0, %default ], [ 1, %case0 ], [ 2, %case1 ], [ 3, %case2 ]
call void @llvm.assume(i1 %bool)
ret i32 %res
}
define i32 @test_assume_var(i32 %cond, i1 %var) {
; CHECK-LABEL: @test_assume_var(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i32 [[COND:%.*]], label [[DEFAULT:%.*]] [
; CHECK-NEXT: i32 0, label [[EXIT:%.*]]
; CHECK-NEXT: i32 1, label [[CASE1:%.*]]
; CHECK-NEXT: i32 2, label [[CASE2:%.*]]
; CHECK-NEXT: ]
; CHECK: case1:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: case2:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: default:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[BOOL:%.*]] = phi i1 [ [[VAR:%.*]], [[DEFAULT]] ], [ true, [[CASE1]] ], [ true, [[CASE2]] ], [ true, [[ENTRY:%.*]] ]
; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[DEFAULT]] ], [ 2, [[CASE1]] ], [ 3, [[CASE2]] ], [ 1, [[ENTRY]] ]
; CHECK-NEXT: call void @llvm.assume(i1 [[BOOL]])
; CHECK-NEXT: ret i32 [[RES]]
;
entry:
switch i32 %cond, label %default [
i32 0, label %case0
i32 1, label %case1
i32 2, label %case2
]
case0:
br label %exit
case1:
br label %exit
case2:
br label %exit
default:
br label %exit
exit:
%bool = phi i1 [ %var, %default ], [ true, %case0 ], [ true, %case1 ], [ true, %case2 ]
%res = phi i32 [ 0, %default ], [ 1, %case0 ], [ 2, %case1 ], [ 3, %case2 ]
call void @llvm.assume(i1 %bool)
ret i32 %res
}
define i32 @test_assume_bundle_nonnull(i32 %cond, ptr nonnull %p) {
; CHECK-LABEL: @test_assume_bundle_nonnull(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i32 [[COND:%.*]], label [[DEFAULT:%.*]] [
; CHECK-NEXT: i32 0, label [[EXIT:%.*]]
; CHECK-NEXT: i32 1, label [[CASE1:%.*]]
; CHECK-NEXT: i32 2, label [[CASE2:%.*]]
; CHECK-NEXT: ]
; CHECK: case1:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: case2:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: default:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[PTR:%.*]] = phi ptr [ null, [[DEFAULT]] ], [ [[P:%.*]], [[CASE1]] ], [ [[P]], [[CASE2]] ], [ [[P]], [[ENTRY:%.*]] ]
; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[DEFAULT]] ], [ 2, [[CASE1]] ], [ 3, [[CASE2]] ], [ 1, [[ENTRY]] ]
; CHECK-NEXT: call void @llvm.assume(i1 true) [ "nonnull"(ptr [[PTR]]) ]
; CHECK-NEXT: ret i32 [[RES]]
;
entry:
switch i32 %cond, label %default [
i32 0, label %case0
i32 1, label %case1
i32 2, label %case2
]
case0:
br label %exit
case1:
br label %exit
case2:
br label %exit
default:
br label %exit
exit:
%ptr = phi ptr [ null, %default ], [ %p, %case0 ], [ %p, %case1 ], [ %p, %case2 ]
%res = phi i32 [ 0, %default ], [ 1, %case0 ], [ 2, %case1 ], [ 3, %case2 ]
call void @llvm.assume(i1 true) [ "nonnull"(ptr %ptr) ]
ret i32 %res
}
define i32 @test_assume_bundle_align(i32 %cond, ptr nonnull %p) {
; CHECK-LABEL: @test_assume_bundle_align(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i32 [[COND:%.*]], label [[DEFAULT:%.*]] [
; CHECK-NEXT: i32 0, label [[EXIT:%.*]]
; CHECK-NEXT: i32 1, label [[CASE1:%.*]]
; CHECK-NEXT: i32 2, label [[CASE2:%.*]]
; CHECK-NEXT: ]
; CHECK: case1:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: case2:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: default:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[PTR:%.*]] = phi ptr [ null, [[DEFAULT]] ], [ [[P:%.*]], [[CASE1]] ], [ [[P]], [[CASE2]] ], [ [[P]], [[ENTRY:%.*]] ]
; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[DEFAULT]] ], [ 2, [[CASE1]] ], [ 3, [[CASE2]] ], [ 1, [[ENTRY]] ]
; CHECK-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[PTR]], i32 8) ]
; CHECK-NEXT: ret i32 [[RES]]
;
entry:
switch i32 %cond, label %default [
i32 0, label %case0
i32 1, label %case1
i32 2, label %case2
]
case0:
br label %exit
case1:
br label %exit
case2:
br label %exit
default:
br label %exit
exit:
%ptr = phi ptr [ null, %default ], [ %p, %case0 ], [ %p, %case1 ], [ %p, %case2 ]
%res = phi i32 [ 0, %default ], [ 1, %case0 ], [ 2, %case1 ], [ 3, %case2 ]
call void @llvm.assume(i1 true) [ "align"(ptr %ptr, i32 8) ]
ret i32 %res
}
; From bb to bb5 is UB.
define i32 @test9_null_user_order_1(ptr %arg, i1 %arg1, ptr %arg2) {
; CHECK-LABEL: @test9_null_user_order_1(
; CHECK-NEXT: bb:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[ARG1:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: [[I:%.*]] = load ptr, ptr [[ARG:%.*]], align 8
; CHECK-NEXT: [[I4:%.*]] = getelementptr inbounds i8, ptr [[I]], i64 1
; CHECK-NEXT: store ptr [[I4]], ptr [[ARG]], align 8
; CHECK-NEXT: [[I7:%.*]] = load i32, ptr [[I]], align 4
; CHECK-NEXT: [[I8:%.*]] = icmp ne ptr [[I]], [[ARG2:%.*]]
; CHECK-NEXT: call void @fn_ptr_arg(i1 [[I8]])
; CHECK-NEXT: ret i32 [[I7]]
;
bb:
br i1 %arg1, label %bb5, label %bb3
bb3: ; preds = %bb
%i = load ptr, ptr %arg, align 8
%i4 = getelementptr inbounds i8, ptr %i, i64 1
store ptr %i4, ptr %arg, align 8
br label %bb5
bb5: ; preds = %bb3, %bb
%i6 = phi ptr [ %i, %bb3 ], [ null, %bb ]
%i7 = load i32, ptr %i6, align 4
%i8 = icmp ne ptr %i6, %arg2
call void @fn_ptr_arg(i1 %i8)
ret i32 %i7
}
define i32 @test9_null_user_order_2(ptr %arg, i1 %arg1, ptr %arg2) {
; CHECK-LABEL: @test9_null_user_order_2(
; CHECK-NEXT: bb:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[ARG1:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: [[I:%.*]] = load ptr, ptr [[ARG:%.*]], align 8
; CHECK-NEXT: [[I4:%.*]] = getelementptr inbounds i8, ptr [[I]], i64 1
; CHECK-NEXT: store ptr [[I4]], ptr [[ARG]], align 8
; CHECK-NEXT: [[I8:%.*]] = icmp ne ptr [[I]], [[ARG2:%.*]]
; CHECK-NEXT: call void @fn_ptr_arg_nounwind_willreturn(i1 [[I8]])
; CHECK-NEXT: [[I7:%.*]] = load i32, ptr [[I]], align 4
; CHECK-NEXT: ret i32 [[I7]]
;
bb:
br i1 %arg1, label %bb5, label %bb3
bb3: ; preds = %bb
%i = load ptr, ptr %arg, align 8
%i4 = getelementptr inbounds i8, ptr %i, i64 1
store ptr %i4, ptr %arg, align 8
br label %bb5
bb5: ; preds = %bb3, %bb
%i6 = phi ptr [ %i, %bb3 ], [ null, %bb ]
%i8 = icmp ne ptr %i6, %arg2
call void @fn_ptr_arg_nounwind_willreturn(i1 %i8)
%i7 = load i32, ptr %i6, align 4
ret i32 %i7
}
attributes #0 = { null_pointer_is_valid }
;.
; CHECK: attributes #[[ATTR0:[0-9]+]] = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write) }
; CHECK: attributes #[[ATTR1:[0-9]+]] = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
; CHECK: attributes #[[ATTR2:[0-9]+]] = { null_pointer_is_valid }
; CHECK: attributes #[[ATTR3:[0-9]+]] = { nounwind willreturn }
; CHECK: attributes #[[ATTR4]] = { nounwind }
;.