forked from OSchip/llvm-project
235 lines
3.5 KiB
C
235 lines
3.5 KiB
C
// RUN: %clang_cc1 -triple i386-unknown-unknown -O0 %s -emit-llvm -o - | FileCheck %s
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// PR9322 and rdar://6970405
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// CHECK: @test1
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: add nsw i32 {{.*}}, 1
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: ret void
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int i;
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void dead();
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void test1() {
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switch (1)
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case 1:
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++i;
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switch (0)
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case 1:
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dead();
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}
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// CHECK: @test2
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: add nsw i32 {{.*}}, 2
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: ret void
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void test2() {
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switch (4) {
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case 1:
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dead();
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break;
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case 4:
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i += 2;
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// Fall off the end of the switch.
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}
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}
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// CHECK: @test3
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: add nsw i32 {{.*}}, 2
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: ret void
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void test3() {
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switch (4) {
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case 1:
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dead();
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break;
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case 4: {
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i += 2;
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break;
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}
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}
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}
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// CHECK: @test4
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: add nsw i32 {{.*}}, 2
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: ret void
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void test4() {
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switch (4) {
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case 1:
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dead();
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break;
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default: {
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i += 2;
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break;
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}
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}
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}
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// This shouldn't crash codegen, but we don't have to optimize out the switch
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// in this case.
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void test5() {
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switch (1) {
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int x; // eliding var decl?
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case 1:
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x = 4;
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i = x;
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break;
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}
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}
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// CHECK: @test6
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: ret void
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void test6() {
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// Neither case is reachable.
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switch (40) {
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case 1:
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dead();
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break;
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case 4: {
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dead();
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break;
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}
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}
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}
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// CHECK: @test7
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: add nsw i32
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: ret void
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void test7() {
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switch (4) {
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case 1:
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dead();
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break;
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{
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case 4: // crazy brace scenario
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++i;
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}
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break;
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}
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}
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// CHECK: @test8
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: add nsw i32
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: ret void
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void test8() {
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switch (4) {
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case 1:
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dead();
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break;
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case 4:
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++i;
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// Fall off the end of the switch.
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}
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}
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// CHECK: @test9
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: add nsw i32
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// CHECK: add nsw i32
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// CHECK-NOT: switch
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// CHECK-NOT: @dead
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// CHECK: ret void
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void test9(int i) {
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switch (1) {
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case 5:
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dead();
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case 1:
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++i;
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// Fall through is fine.
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case 4:
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++i;
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break;
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}
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}
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// CHECK: @test10
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// CHECK-NOT: switch
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// CHECK: ret i32
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int test10(void) {
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switch(8) {
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case 8:
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break;
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case 4:
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break;
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default:
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dead();
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}
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return 0;
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}
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// CHECK: @test11
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// CHECK-NOT: switch
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// CHECK: ret void
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void test11() {
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switch (1) {
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case 1:
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break;
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case 42: ;
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int x; // eliding var decl?
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x = 4;
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break;
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}
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}
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// CHECK: @test12
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// CHECK-NOT: switch
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// CHECK: ret void
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void test12() {
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switch (1) {
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case 2: {
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int a; // Ok to skip this vardecl.
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a = 42;
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}
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case 1:
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break;
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case 42: ;
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int x; // eliding var decl?
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x = 4;
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break;
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}
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}
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// Verify that case 42 only calls test14 once.
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// CHECK: @test13
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// CHECK: call void @test13(i32 97)
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// CHECK-NEXT: br label %[[EPILOG2:[0-9.a-z]+]]
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// CHECK: [[EPILOG2]]
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// CHECK-NEXT: br label [[EPILOG:%[0-9.a-z]+]]
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// CHECK: call void @test13(i32 42)
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// CHECK-NEXT: br label [[EPILOG]]
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void test13(int x) {
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switch (x) {
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case 42: test13(97); // fallthrough
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case 11: break;
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default: test13(42); break;
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}
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}
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