derek.holloway
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89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 5
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// RUN: %clang_cc1 -std=c23 -Wno-error=odr -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
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// This tests the codegen behavior of redefined tag types to ensure the
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// generated code looks reasonable.
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enum E {
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One = 1,
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Zero = 0,
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Two = 2
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};
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struct S {
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int x;
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int y;
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};
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struct S func(struct S s, enum E e);
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struct S {
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int x, y;
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} what();
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// CHECK-LABEL: define dso_local i64 @func(
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// CHECK-SAME: i64 [[S_COERCE:%.*]], i32 noundef [[E:%.*]]) #[[ATTR0:[0-9]+]] {
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// CHECK-NEXT: [[ENTRY:.*:]]
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// CHECK-NEXT: [[RETVAL:%.*]] = alloca [[STRUCT_S:%.*]], align 4
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// CHECK-NEXT: [[S:%.*]] = alloca [[STRUCT_S]], align 4
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// CHECK-NEXT: [[E_ADDR:%.*]] = alloca i32, align 4
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// CHECK-NEXT: store i64 [[S_COERCE]], ptr [[S]], align 4
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// CHECK-NEXT: store i32 [[E]], ptr [[E_ADDR]], align 4
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// CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[E_ADDR]], align 4
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// CHECK-NEXT: [[X:%.*]] = getelementptr inbounds nuw [[STRUCT_S]], ptr [[S]], i32 0, i32 0
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// CHECK-NEXT: store i32 [[TMP0]], ptr [[X]], align 4
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// CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr align 4 [[RETVAL]], ptr align 4 [[S]], i64 8, i1 false)
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// CHECK-NEXT: [[TMP1:%.*]] = load i64, ptr [[RETVAL]], align 4
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// CHECK-NEXT: ret i64 [[TMP1]]
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//
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struct S func(struct S s, enum E e) {
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s.x = (int)e;
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return s;
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}
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enum E {
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Zero,
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One,
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Two
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};
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// Ensure that ignoring the incompatibility due to attributes does not cause a
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// crash. Note, this is undefined behavior in Clang until we implement
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// attribute structural compatibility logic, so this is not intended to verify
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// any particular behavior beyond "don't crash."
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struct T {
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_Alignas(double) int x;
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};
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// CHECK-LABEL: define dso_local i32 @foo(
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// CHECK-SAME: i32 [[T_COERCE:%.*]]) #[[ATTR0]] {
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// CHECK-NEXT: [[ENTRY:.*:]]
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// CHECK-NEXT: [[T:%.*]] = alloca [[STRUCT_T:%.*]], align 8
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// CHECK-NEXT: [[COERCE_DIVE:%.*]] = getelementptr inbounds nuw [[STRUCT_T]], ptr [[T]], i32 0, i32 0
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// CHECK-NEXT: store i32 [[T_COERCE]], ptr [[COERCE_DIVE]], align 8
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// CHECK-NEXT: [[X:%.*]] = getelementptr inbounds nuw [[STRUCT_T]], ptr [[T]], i32 0, i32 0
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// CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[X]], align 8
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// CHECK-NEXT: ret i32 [[TMP0]]
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//
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int foo(struct T t) {
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return t.x;
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}
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struct T {
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int x;
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};
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// CHECK-LABEL: define dso_local i32 @bar(
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// CHECK-SAME: i32 [[T_COERCE:%.*]]) #[[ATTR0]] {
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// CHECK-NEXT: [[ENTRY:.*:]]
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// CHECK-NEXT: [[T:%.*]] = alloca [[STRUCT_T:%.*]], align 8
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// CHECK-NEXT: [[COERCE_DIVE:%.*]] = getelementptr inbounds nuw [[STRUCT_T]], ptr [[T]], i32 0, i32 0
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// CHECK-NEXT: store i32 [[T_COERCE]], ptr [[COERCE_DIVE]], align 8
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// CHECK-NEXT: [[X:%.*]] = getelementptr inbounds nuw [[STRUCT_T]], ptr [[T]], i32 0, i32 0
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// CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[X]], align 8
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// CHECK-NEXT: ret i32 [[TMP0]]
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//
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int bar(struct T t) {
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return t.x;
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}
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