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clang-p2996/llvm/test/Transforms/Attributor/nofree.ll
Johannes Doerfert d445b6dfec [Attributor] Cleanup ::initialize of various AAs 
This commit cleans up the ::initialize method of various AAs in the
following ways:
  - If an associated function is required, give up on declarations.
    This was discovered as a real problem when lots of llvm.dbg.XXX
    call sites were assumed `noreturn` until proven otherwise. That
    does not make any sense and caused huge regressions and missed
    deductions.
  - Require more associated declarations for function interface AAs.
  - Use the IRAttribute::initialize to determine if function interface
    AAs can be used in IPO, don't replicate the checks (especially
    isFunctionIPOAmendable) all over the place. Arguably the function
    declaration check should be moved to some central place to.
2020-09-09 01:38:25 -05:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --check-attributes
; RUN: opt -attributor -enable-new-pm=0 -attributor-manifest-internal -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=3 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_NPM,NOT_CGSCC_OPM,NOT_TUNIT_NPM,IS__TUNIT____,IS________OPM,IS__TUNIT_OPM
; RUN: opt -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=3 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_OPM,NOT_CGSCC_NPM,NOT_TUNIT_OPM,IS__TUNIT____,IS________NPM,IS__TUNIT_NPM
; RUN: opt -attributor-cgscc -enable-new-pm=0 -attributor-manifest-internal -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_TUNIT_NPM,NOT_TUNIT_OPM,NOT_CGSCC_NPM,IS__CGSCC____,IS________OPM,IS__CGSCC_OPM
; RUN: opt -aa-pipeline=basic-aa -passes=attributor-cgscc -attributor-manifest-internal -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_TUNIT_NPM,NOT_TUNIT_OPM,NOT_CGSCC_OPM,IS__CGSCC____,IS________NPM,IS__CGSCC_NPM
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
; Test cases specifically designed for the "nofree" function attribute.
; We use FIXME's to indicate problems and missing attributes.
; Free functions
declare void @free(i8* nocapture) local_unnamed_addr #1
declare noalias i8* @realloc(i8* nocapture, i64) local_unnamed_addr #0
declare void @_ZdaPv(i8*) local_unnamed_addr #2
; TEST 1 (positive case)
define void @only_return() #0 {
; IS__TUNIT____: Function Attrs: nofree noinline nosync nounwind readnone uwtable willreturn
; IS__TUNIT____-LABEL: define {{[^@]+}}@only_return
; IS__TUNIT____-SAME: () [[ATTR3:#.*]] {
; IS__TUNIT____-NEXT: ret void
;
; IS__CGSCC____: Function Attrs: nofree noinline norecurse nosync nounwind readnone uwtable willreturn
; IS__CGSCC____-LABEL: define {{[^@]+}}@only_return
; IS__CGSCC____-SAME: () [[ATTR3:#.*]] {
; IS__CGSCC____-NEXT: ret void
;
ret void
}
; TEST 2 (negative case)
; Only free
; void only_free(char* p) {
; free(p);
; }
define void @only_free(i8* nocapture %0) local_unnamed_addr #0 {
; CHECK: Function Attrs: noinline nounwind uwtable
; CHECK-LABEL: define {{[^@]+}}@only_free
; CHECK-SAME: (i8* nocapture [[TMP0:%.*]]) local_unnamed_addr [[ATTR1:#.*]] {
; CHECK-NEXT: tail call void @free(i8* nocapture [[TMP0]]) [[ATTR0:#.*]]
; CHECK-NEXT: ret void
;
tail call void @free(i8* %0) #1
ret void
}
; TEST 3 (negative case)
; Free occurs in same scc.
; void free_in_scc1(char*p){
; free_in_scc2(p);
; }
; void free_in_scc2(char*p){
; free_in_scc1(p);
; free(p);
; }
define void @free_in_scc1(i8* nocapture %0) local_unnamed_addr #0 {
; CHECK: Function Attrs: noinline nounwind uwtable
; CHECK-LABEL: define {{[^@]+}}@free_in_scc1
; CHECK-SAME: (i8* nocapture [[TMP0:%.*]]) local_unnamed_addr [[ATTR1]] {
; CHECK-NEXT: tail call void @free_in_scc2(i8* nocapture [[TMP0]]) [[ATTR0]]
; CHECK-NEXT: ret void
;
tail call void @free_in_scc2(i8* %0) #1
ret void
}
define void @free_in_scc2(i8* nocapture %0) local_unnamed_addr #0 {
; CHECK: Function Attrs: noinline nounwind uwtable
; CHECK-LABEL: define {{[^@]+}}@free_in_scc2
; CHECK-SAME: (i8* nocapture [[TMP0:%.*]]) local_unnamed_addr [[ATTR1]] {
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8* [[TMP0]], null
; CHECK-NEXT: br i1 [[CMP]], label [[REC:%.*]], label [[CALL:%.*]]
; CHECK: call:
; CHECK-NEXT: tail call void @free(i8* nocapture [[TMP0]]) [[ATTR0]]
; CHECK-NEXT: br label [[END:%.*]]
; CHECK: rec:
; CHECK-NEXT: tail call void @free_in_scc1(i8* nocapture [[TMP0]]) [[ATTR0]]
; CHECK-NEXT: br label [[END]]
; CHECK: end:
; CHECK-NEXT: ret void
;
%cmp = icmp eq i8* %0, null
br i1 %cmp, label %rec, label %call
call:
tail call void @free(i8* %0) #1
br label %end
rec:
tail call void @free_in_scc1(i8* %0)
br label %end
end:
ret void
}
; TEST 4 (positive case)
; Free doesn't occur.
; void mutual_recursion1(){
; mutual_recursion2();
; }
; void mutual_recursion2(){
; mutual_recursion1();
; }
define void @mutual_recursion1() #0 {
; NOT_CGSCC_NPM: Function Attrs: nofree noinline noreturn nosync nounwind readnone uwtable willreturn
; NOT_CGSCC_NPM-LABEL: define {{[^@]+}}@mutual_recursion1
; NOT_CGSCC_NPM-SAME: () [[ATTR4:#.*]] {
; NOT_CGSCC_NPM-NEXT: unreachable
;
; IS__CGSCC_NPM: Function Attrs: nofree noinline norecurse noreturn nosync nounwind readnone uwtable willreturn
; IS__CGSCC_NPM-LABEL: define {{[^@]+}}@mutual_recursion1
; IS__CGSCC_NPM-SAME: () [[ATTR4:#.*]] {
; IS__CGSCC_NPM-NEXT: unreachable
;
call void @mutual_recursion2()
ret void
}
define void @mutual_recursion2() #0 {
; NOT_CGSCC_NPM: Function Attrs: nofree noinline noreturn nosync nounwind readnone uwtable willreturn
; NOT_CGSCC_NPM-LABEL: define {{[^@]+}}@mutual_recursion2
; NOT_CGSCC_NPM-SAME: () [[ATTR4]] {
; NOT_CGSCC_NPM-NEXT: unreachable
;
; IS__CGSCC_NPM: Function Attrs: nofree noinline norecurse noreturn nosync nounwind readnone uwtable willreturn
; IS__CGSCC_NPM-LABEL: define {{[^@]+}}@mutual_recursion2
; IS__CGSCC_NPM-SAME: () [[ATTR4]] {
; IS__CGSCC_NPM-NEXT: unreachable
;
call void @mutual_recursion1()
ret void
}
; TEST 5
; C++ delete operation (negative case)
; void delete_op (char p[]){
; delete [] p;
; }
define void @_Z9delete_opPc(i8* %0) local_unnamed_addr #0 {
; CHECK: Function Attrs: noinline nounwind uwtable
; CHECK-LABEL: define {{[^@]+}}@_Z9delete_opPc
; CHECK-SAME: (i8* [[TMP0:%.*]]) local_unnamed_addr [[ATTR1]] {
; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8* [[TMP0]], null
; CHECK-NEXT: br i1 [[TMP2]], label [[TMP4:%.*]], label [[TMP3:%.*]]
; CHECK: 3:
; CHECK-NEXT: tail call void @_ZdaPv(i8* nonnull [[TMP0]]) [[ATTR2:#.*]]
; CHECK-NEXT: br label [[TMP4]]
; CHECK: 4:
; CHECK-NEXT: ret void
;
%2 = icmp eq i8* %0, null
br i1 %2, label %4, label %3
; <label>:3: ; preds = %1
tail call void @_ZdaPv(i8* nonnull %0) #2
br label %4
; <label>:4: ; preds = %3, %1
ret void
}
; TEST 6 (negative case)
; Call realloc
define noalias i8* @call_realloc(i8* nocapture %0, i64 %1) local_unnamed_addr #0 {
; CHECK: Function Attrs: noinline nounwind uwtable
; CHECK-LABEL: define {{[^@]+}}@call_realloc
; CHECK-SAME: (i8* nocapture [[TMP0:%.*]], i64 [[TMP1:%.*]]) local_unnamed_addr [[ATTR1]] {
; CHECK-NEXT: [[RET:%.*]] = tail call i8* @realloc(i8* nocapture [[TMP0]], i64 [[TMP1]]) [[ATTR2]]
; CHECK-NEXT: ret i8* [[RET]]
;
%ret = tail call i8* @realloc(i8* %0, i64 %1) #2
ret i8* %ret
}
; TEST 7 (positive case)
; Call function declaration with "nofree"
; CHECK: Function Attrs: nofree noinline nounwind readnone uwtable
; CHECK-NEXT: declare void @nofree_function()
declare void @nofree_function() nofree readnone #0
define void @call_nofree_function() #0 {
; IS__TUNIT____: Function Attrs: nofree noinline nosync nounwind readnone uwtable willreturn
; IS__TUNIT____-LABEL: define {{[^@]+}}@call_nofree_function
; IS__TUNIT____-SAME: () [[ATTR3]] {
; IS__TUNIT____-NEXT: ret void
;
; IS__CGSCC____: Function Attrs: nofree noinline norecurse nosync nounwind readnone uwtable willreturn
; IS__CGSCC____-LABEL: define {{[^@]+}}@call_nofree_function
; IS__CGSCC____-SAME: () [[ATTR3]] {
; IS__CGSCC____-NEXT: ret void
;
tail call void @nofree_function()
ret void
}
; TEST 8 (negative case)
; Call function declaration without "nofree"
; CHECK: Function Attrs: noinline nounwind uwtable
; CHECK-NEXT: declare void @maybe_free()
declare void @maybe_free() #0
define void @call_maybe_free() #0 {
; CHECK: Function Attrs: noinline nounwind uwtable
; CHECK-LABEL: define {{[^@]+}}@call_maybe_free
; CHECK-SAME: () [[ATTR1]] {
; CHECK-NEXT: tail call void @maybe_free() [[ATTR0]]
; CHECK-NEXT: ret void
;
tail call void @maybe_free()
ret void
}
; TEST 9 (negative case)
; Call both of above functions
define void @call_both() #0 {
; CHECK: Function Attrs: noinline nounwind uwtable
; CHECK-LABEL: define {{[^@]+}}@call_both
; CHECK-SAME: () [[ATTR1]] {
; CHECK-NEXT: tail call void @maybe_free() [[ATTR0]]
; CHECK-NEXT: ret void
;
tail call void @maybe_free()
tail call void @nofree_function()
ret void
}
; TEST 10 (positive case)
; Call intrinsic function
; CHECK: Function Attrs: nounwind readnone speculatable
; CHECK-NEXT: declare float @llvm.floor.f32(float)
declare float @llvm.floor.f32(float)
define void @call_floor(float %a) #0 {
; IS__TUNIT____: Function Attrs: nofree noinline nosync nounwind readnone uwtable willreturn
; IS__TUNIT____-LABEL: define {{[^@]+}}@call_floor
; IS__TUNIT____-SAME: (float [[A:%.*]]) [[ATTR3]] {
; IS__TUNIT____-NEXT: ret void
;
; IS__CGSCC____: Function Attrs: nofree noinline norecurse nosync nounwind readnone uwtable willreturn
; IS__CGSCC____-LABEL: define {{[^@]+}}@call_floor
; IS__CGSCC____-SAME: (float [[A:%.*]]) [[ATTR3]] {
; IS__CGSCC____-NEXT: ret void
;
tail call float @llvm.floor.f32(float %a)
ret void
}
; FIXME: missing nofree
define float @call_floor2(float %a) #0 {
; CHECK: Function Attrs: noinline nosync nounwind readnone uwtable willreturn
; CHECK-LABEL: define {{[^@]+}}@call_floor2
; CHECK-SAME: (float [[A:%.*]]) [[ATTR7:#.*]] {
; CHECK-NEXT: [[C:%.*]] = tail call float @llvm.floor.f32(float [[A]]) [[ATTR11:#.*]]
; CHECK-NEXT: ret float [[C]]
;
%c = tail call float @llvm.floor.f32(float %a)
ret float %c
}
; TEST 11 (positive case)
; Check propagation.
define void @f1() #0 {
; IS__TUNIT____: Function Attrs: nofree noinline nosync nounwind readnone uwtable willreturn
; IS__TUNIT____-LABEL: define {{[^@]+}}@f1
; IS__TUNIT____-SAME: () [[ATTR3]] {
; IS__TUNIT____-NEXT: ret void
;
; IS__CGSCC____: Function Attrs: nofree noinline norecurse nosync nounwind readnone uwtable willreturn
; IS__CGSCC____-LABEL: define {{[^@]+}}@f1
; IS__CGSCC____-SAME: () [[ATTR3]] {
; IS__CGSCC____-NEXT: ret void
;
tail call void @nofree_function()
ret void
}
define void @f2() #0 {
; IS__TUNIT____: Function Attrs: nofree noinline nosync nounwind readnone uwtable willreturn
; IS__TUNIT____-LABEL: define {{[^@]+}}@f2
; IS__TUNIT____-SAME: () [[ATTR3]] {
; IS__TUNIT____-NEXT: ret void
;
; IS__CGSCC____: Function Attrs: nofree noinline norecurse nosync nounwind readnone uwtable willreturn
; IS__CGSCC____-LABEL: define {{[^@]+}}@f2
; IS__CGSCC____-SAME: () [[ATTR3]] {
; IS__CGSCC____-NEXT: ret void
;
tail call void @f1()
ret void
}
; TEST 12 NoFree argument - positive.
define double @test12(double* nocapture readonly %a) {
; CHECK: Function Attrs: nofree nounwind
; CHECK-LABEL: define {{[^@]+}}@test12
; CHECK-SAME: (double* nocapture nofree nonnull readonly align 8 dereferenceable(8) [[A:%.*]]) [[ATTR8:#.*]] {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = load double, double* [[A]], align 8
; CHECK-NEXT: [[CALL:%.*]] = tail call double @cos(double [[TMP0]]) [[ATTR2]]
; CHECK-NEXT: ret double [[CALL]]
;
entry:
%0 = load double, double* %a, align 8
%call = tail call double @cos(double %0) #2
ret double %call
}
declare double @cos(double) nobuiltin nounwind nofree
; FIXME: %a should be nofree.
; TEST 13 NoFree argument - positive.
define noalias i32* @test13(i64* nocapture readonly %a) {
; CHECK: Function Attrs: nounwind
; CHECK-LABEL: define {{[^@]+}}@test13
; CHECK-SAME: (i64* nocapture nonnull readonly align 8 dereferenceable(8) [[A:%.*]]) [[ATTR0]] {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = load i64, i64* [[A]], align 8
; CHECK-NEXT: [[CALL:%.*]] = tail call noalias i8* @malloc(i64 [[TMP0]]) [[ATTR2]]
; CHECK-NEXT: [[TMP1:%.*]] = bitcast i8* [[CALL]] to i32*
; CHECK-NEXT: ret i32* [[TMP1]]
;
entry:
%0 = load i64, i64* %a, align 8
%call = tail call noalias i8* @malloc(i64 %0) #2
%1 = bitcast i8* %call to i32*
ret i32* %1
}
define void @test14(i8* nocapture %0, i8* nocapture %1) {
; CHECK: Function Attrs: nounwind
; CHECK-LABEL: define {{[^@]+}}@test14
; CHECK-SAME: (i8* nocapture [[TMP0:%.*]], i8* nocapture nofree readnone [[TMP1:%.*]]) [[ATTR0]] {
; CHECK-NEXT: tail call void @free(i8* nocapture [[TMP0]]) [[ATTR0]]
; CHECK-NEXT: ret void
;
tail call void @free(i8* %0) #1
ret void
}
; UTC_ARGS: --enable
define void @nonnull_assume_pos(i8* %arg1, i8* %arg2, i8* %arg3, i8* %arg4) {
; ATTRIBUTOR-LABEL: define {{[^@]+}}@nonnull_assume_pos
; ATTRIBUTOR-SAME: (i8* nofree [[ARG1:%.*]], i8* [[ARG2:%.*]], i8* nofree [[ARG3:%.*]], i8* [[ARG4:%.*]])
; ATTRIBUTOR-NEXT: call void @llvm.assume(i1 true) #11 [ "nofree"(i8* [[ARG1]]), "nofree"(i8* [[ARG3]]) ]
; ATTRIBUTOR-NEXT: call void @unknown(i8* nofree [[ARG1]], i8* [[ARG2]], i8* nofree [[ARG3]], i8* [[ARG4]])
; ATTRIBUTOR-NEXT: ret void
;
; CHECK-LABEL: define {{[^@]+}}@nonnull_assume_pos
; CHECK-SAME: (i8* nofree [[ARG1:%.*]], i8* [[ARG2:%.*]], i8* nofree [[ARG3:%.*]], i8* [[ARG4:%.*]]) {
; CHECK-NEXT: call void @llvm.assume(i1 noundef true) [[ATTR11]] [ "nofree"(i8* [[ARG1]]), "nofree"(i8* [[ARG3]]) ]
; CHECK-NEXT: call void @unknown(i8* nofree [[ARG1]], i8* [[ARG2]], i8* nofree [[ARG3]], i8* [[ARG4]])
; CHECK-NEXT: ret void
;
call void @llvm.assume(i1 true) ["nofree"(i8* %arg1), "nofree"(i8* %arg3)]
call void @unknown(i8* %arg1, i8* %arg2, i8* %arg3, i8* %arg4)
ret void
}
define void @nonnull_assume_neg(i8* %arg1, i8* %arg2, i8* %arg3, i8* %arg4) {
; ATTRIBUTOR-LABEL: define {{[^@]+}}@nonnull_assume_neg
; ATTRIBUTOR-SAME: (i8* [[ARG1:%.*]], i8* [[ARG2:%.*]], i8* [[ARG3:%.*]], i8* [[ARG4:%.*]])
; ATTRIBUTOR-NEXT: call void @unknown(i8* [[ARG1]], i8* [[ARG2]], i8* [[ARG3]], i8* [[ARG4]])
; ATTRIBUTOR-NEXT: call void @llvm.assume(i1 true) [ "nofree"(i8* [[ARG1]]), "nofree"(i8* [[ARG3]]) ]
; ATTRIBUTOR-NEXT: ret void
;
; CHECK-LABEL: define {{[^@]+}}@nonnull_assume_neg
; CHECK-SAME: (i8* [[ARG1:%.*]], i8* [[ARG2:%.*]], i8* [[ARG3:%.*]], i8* [[ARG4:%.*]]) {
; CHECK-NEXT: call void @unknown(i8* [[ARG1]], i8* [[ARG2]], i8* [[ARG3]], i8* [[ARG4]])
; CHECK-NEXT: call void @llvm.assume(i1 noundef true) [ "nofree"(i8* [[ARG1]]), "nofree"(i8* [[ARG3]]) ]
; CHECK-NEXT: ret void
;
call void @unknown(i8* %arg1, i8* %arg2, i8* %arg3, i8* %arg4)
call void @llvm.assume(i1 true) ["nofree"(i8* %arg1), "nofree"(i8* %arg3)]
ret void
}
define void @nonnull_assume_call(i8* %arg1, i8* %arg2, i8* %arg3, i8* %arg4) {
; ATTRIBUTOR-LABEL: define {{[^@]+}}@nonnull_assume_call
; ATTRIBUTOR-SAME: (i8* [[ARG1:%.*]], i8* [[ARG2:%.*]], i8* [[ARG3:%.*]], i8* [[ARG4:%.*]])
; ATTRIBUTOR-NEXT: call void @unknown(i8* [[ARG1]], i8* [[ARG2]], i8* [[ARG3]], i8* [[ARG4]])
; ATTRIBUTOR-NEXT: call void @use_i8_ptr(i8* noalias readnone [[ARG1]])
; ATTRIBUTOR-NEXT: call void @use_i8_ptr(i8* noalias readnone [[ARG2]])
; ATTRIBUTOR-NEXT: call void @llvm.assume(i1 true) [ "nofree"(i8* [[ARG1]]), "nofree"(i8* [[ARG3]]) ]
; ATTRIBUTOR-NEXT: call void @use_i8_ptr(i8* noalias nofree readnone [[ARG3]])
; ATTRIBUTOR-NEXT: call void @use_i8_ptr(i8* noalias readnone [[ARG4]])
; ATTRIBUTOR-NEXT: call void @use_i8_ptr_ret(i8* noalias nofree readnone [[ARG1]])
; ATTRIBUTOR-NEXT: call void @use_i8_ptr_ret(i8* noalias readnone [[ARG2]])
; ATTRIBUTOR-NEXT: call void @llvm.assume(i1 true) [ "nofree"(i8* [[ARG1]]), "nofree"(i8* [[ARG4]]) ]
; ATTRIBUTOR-NEXT: call void @use_i8_ptr_ret(i8* noalias nofree readnone [[ARG3]])
; ATTRIBUTOR-NEXT: call void @use_i8_ptr_ret(i8* noalias nofree readnone [[ARG4]])
; ATTRIBUTOR-NEXT: ret void
;
; CHECK-LABEL: define {{[^@]+}}@nonnull_assume_call
; CHECK-SAME: (i8* [[ARG1:%.*]], i8* [[ARG2:%.*]], i8* [[ARG3:%.*]], i8* [[ARG4:%.*]]) {
; CHECK-NEXT: call void @unknown(i8* [[ARG1]], i8* [[ARG2]], i8* [[ARG3]], i8* [[ARG4]])
; CHECK-NEXT: call void @use_i8_ptr(i8* noalias nocapture readnone [[ARG1]]) [[ATTR0]]
; CHECK-NEXT: call void @use_i8_ptr(i8* noalias nocapture readnone [[ARG2]]) [[ATTR0]]
; CHECK-NEXT: call void @llvm.assume(i1 noundef true) [ "nofree"(i8* [[ARG1]]), "nofree"(i8* [[ARG3]]) ]
; CHECK-NEXT: call void @use_i8_ptr(i8* noalias nocapture nofree readnone [[ARG3]]) [[ATTR0]]
; CHECK-NEXT: call void @use_i8_ptr(i8* noalias nocapture readnone [[ARG4]]) [[ATTR0]]
; CHECK-NEXT: call void @use_i8_ptr_ret(i8* noalias nocapture nofree readnone [[ARG1]]) [[ATTR0]]
; CHECK-NEXT: call void @use_i8_ptr_ret(i8* noalias nocapture readnone [[ARG2]]) [[ATTR0]]
; CHECK-NEXT: call void @llvm.assume(i1 noundef true) [ "nofree"(i8* [[ARG1]]), "nofree"(i8* [[ARG4]]) ]
; CHECK-NEXT: call void @use_i8_ptr_ret(i8* noalias nocapture nofree readnone [[ARG3]]) [[ATTR0]]
; CHECK-NEXT: call void @use_i8_ptr_ret(i8* noalias nocapture nofree readnone [[ARG4]]) [[ATTR0]]
; CHECK-NEXT: ret void
;
call void @unknown(i8* %arg1, i8* %arg2, i8* %arg3, i8* %arg4)
call void @use_i8_ptr(i8* %arg1)
call void @use_i8_ptr(i8* %arg2)
call void @llvm.assume(i1 true) ["nofree"(i8* %arg1), "nofree"(i8* %arg3)]
call void @use_i8_ptr(i8* %arg3)
call void @use_i8_ptr(i8* %arg4)
call void @use_i8_ptr_ret(i8* %arg1)
call void @use_i8_ptr_ret(i8* %arg2)
call void @llvm.assume(i1 true) ["nofree"(i8* %arg1), "nofree"(i8* %arg4)]
call void @use_i8_ptr_ret(i8* %arg3)
call void @use_i8_ptr_ret(i8* %arg4)
ret void
}
declare void @llvm.assume(i1)
declare void @unknown(i8*, i8*, i8*, i8*)
declare void @use_i8_ptr(i8* nocapture readnone) nounwind
declare void @use_i8_ptr_ret(i8* nocapture readnone) nounwind willreturn
declare noalias i8* @malloc(i64)
attributes #0 = { nounwind uwtable noinline }
attributes #1 = { nounwind }
attributes #2 = { nobuiltin nounwind }
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