81429abd83
This was reported as PR49104. The reproducer uses varargs but the issue is the same, we know an argument is dead but can't change the signature for some reason. The PR49104 situation was: We are in an CG-SCC traversal and we remove all the uses of an argument and proof it thereby dead. However, if we do not remove the argument, via signature rewrite, we need to ensure that the `undef` we introduce at the call site doesn't clash with a `noundef` attribute.
127 lines
5.0 KiB
LLVM
127 lines
5.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --check-attributes
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; RUN: opt -attributor -enable-new-pm=0 -attributor-manifest-internal -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=1 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_NPM,NOT_CGSCC_OPM,NOT_TUNIT_NPM,IS__TUNIT____,IS________OPM,IS__TUNIT_OPM
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; RUN: opt -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=1 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_OPM,NOT_CGSCC_NPM,NOT_TUNIT_OPM,IS__TUNIT____,IS________NPM,IS__TUNIT_NPM
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; 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
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; 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
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declare void @unknown()
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declare void @bar(i32*)
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define void @foo() {
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; CHECK-LABEL: define {{[^@]+}}@foo() {
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; CHECK-NEXT: [[X:%.*]] = alloca i32, align 4
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; CHECK-NEXT: call void @unknown()
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; CHECK-NEXT: call void @bar(i32* noundef nonnull align 4 dereferenceable(4) [[X]])
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; CHECK-NEXT: ret void
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;
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%x = alloca i32
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call void @unknown()
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call void @bar(i32* %x)
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ret void
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}
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define internal i8* @returned_dead() {
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; CHECK-LABEL: define {{[^@]+}}@returned_dead() {
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; CHECK-NEXT: call void @unknown()
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; CHECK-NEXT: ret i8* undef
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;
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call void @unknown()
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ret i8* null
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}
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define void @caller1() {
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; CHECK-LABEL: define {{[^@]+}}@caller1() {
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; CHECK-NEXT: [[TMP1:%.*]] = call i8* @returned_dead()
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; CHECK-NEXT: ret void
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;
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call i8* @returned_dead()
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ret void
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}
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define internal void @argument_dead_callback_callee(i8* %c) {
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; CHECK-LABEL: define {{[^@]+}}@argument_dead_callback_callee
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; CHECK-SAME: (i8* noalias nocapture nofree readnone align 536870912 [[C:%.*]]) {
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; CHECK-NEXT: call void @unknown()
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; CHECK-NEXT: ret void
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;
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call void @unknown()
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ret void
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}
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define void @callback_caller() {
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; IS__TUNIT____-LABEL: define {{[^@]+}}@callback_caller() {
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; IS__TUNIT____-NEXT: call void @callback_broker(void (i8*)* noundef @argument_dead_callback_callee, i8* noalias nocapture nofree readnone align 536870912 undef)
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; IS__TUNIT____-NEXT: ret void
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;
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; IS__CGSCC____-LABEL: define {{[^@]+}}@callback_caller() {
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; IS__CGSCC____-NEXT: call void @callback_broker(void (i8*)* noundef @argument_dead_callback_callee, i8* noalias nocapture nofree noundef readnone align 536870912 null)
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; IS__CGSCC____-NEXT: ret void
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;
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call void @callback_broker(void (i8*)* @argument_dead_callback_callee, i8* null)
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ret void
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}
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; Drop the noundef if when we replace the call argument with `undef`. We use a
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; varargs function as we cannot (yet) rewrite their signature. If we ever can,
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; try to come up with a different scheme to verify the `noundef` is dropped if
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; signature rewriting is not happening.
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define internal void @callee_with_dead_noundef_arg(i1 noundef %create, ...) {
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; CHECK-LABEL: define {{[^@]+}}@callee_with_dead_noundef_arg
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; CHECK-SAME: (i1 [[CREATE:%.*]], ...) {
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; CHECK-NEXT: call void @unknown()
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; CHECK-NEXT: ret void
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;
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call void @unknown()
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ret void
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}
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define void @caller_with_unused_arg(i1 %c) {
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; CHECK-LABEL: define {{[^@]+}}@caller_with_unused_arg
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; CHECK-SAME: (i1 [[C:%.*]]) {
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; CHECK-NEXT: call void (i1, ...) @callee_with_dead_noundef_arg(i1 undef)
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; CHECK-NEXT: ret void
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;
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call void (i1, ...) @callee_with_dead_noundef_arg(i1 %c)
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ret void
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}
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define internal void @callee_with_dead_arg(i1 %create, ...) {
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; CHECK-LABEL: define {{[^@]+}}@callee_with_dead_arg
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; CHECK-SAME: (i1 [[CREATE:%.*]], ...) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[IF_THEN3:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: unreachable
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; CHECK: if.then3:
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; CHECK-NEXT: call void @unknown()
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; CHECK-NEXT: ret void
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;
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entry:
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br i1 %create, label %if.then3, label %if.then
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if.then: ; preds = %entry
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ret void
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if.then3: ; preds = %entry
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call void @unknown()
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ret void
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}
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; Drop the noundef if when we replace the call argument with `undef`. We use a
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; varargs function as we cannot (yet) rewrite their signature. If we ever can,
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; try to come up with a different scheme to verify the `noundef` is dropped if
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; signature rewriting is not happening.
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define void @caller_with_noundef_arg() {
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; CHECK-LABEL: define {{[^@]+}}@caller_with_noundef_arg() {
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; CHECK-NEXT: call void (i1, ...) @callee_with_dead_arg(i1 undef)
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; CHECK-NEXT: ret void
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;
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call void (i1, ...) @callee_with_dead_arg(i1 noundef true)
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ret void
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}
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declare !callback !0 void @callback_broker(void (i8*)*, i8*)
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!1 = !{i64 0, i64 1, i1 false}
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!0 = !{!1}
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