116 lines
2.2 KiB
C
116 lines
2.2 KiB
C
// RUN: %clang_cc1 -S -emit-llvm -o - -O2 -disable-llvm-passes %s | FileCheck %s -check-prefixes=CHECK,O2
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// RUN: %clang_cc1 -S -emit-llvm -o - -O2 -disable-lifetime-markers %s \
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// RUN: | FileCheck %s -check-prefixes=CHECK,O0
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// RUN: %clang_cc1 -S -emit-llvm -o - -O0 %s | FileCheck %s -check-prefixes=CHECK,O0
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extern int bar(char *A, int n);
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// CHECK-LABEL: @foo
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// O0-NOT: @llvm.lifetime.start
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int foo (int n) {
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if (n) {
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// O2: @llvm.lifetime.start
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char A[100];
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return bar(A, 1);
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} else {
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// O2: @llvm.lifetime.start
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char A[100];
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return bar(A, 2);
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}
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}
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// CHECK-LABEL: @no_goto_bypass
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void no_goto_bypass() {
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// O2: @llvm.lifetime.start.p0i8(i64 1
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char x;
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l1:
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bar(&x, 1);
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char y[5];
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bar(y, 5);
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goto l1;
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// Infinite loop
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// O2-NOT: @llvm.lifetime.end.p0i8(
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}
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// CHECK-LABEL: @goto_bypass
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void goto_bypass() {
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{
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// O2-NOT: @llvm.lifetime.start.p0i8(i64 1
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// O2-NOT: @llvm.lifetime.end.p0i8(i64 1
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char x;
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l1:
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bar(&x, 1);
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}
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goto l1;
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}
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// CHECK-LABEL: @no_switch_bypass
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void no_switch_bypass(int n) {
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switch (n) {
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case 1: {
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// O2: @llvm.lifetime.start.p0i8(i64 1
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// O2: @llvm.lifetime.end.p0i8(i64 1
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char x;
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bar(&x, 1);
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break;
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}
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case 2:
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n = n;
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// O2: @llvm.lifetime.start.p0i8(i64 5
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// O2: @llvm.lifetime.end.p0i8(i64 5
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char y[5];
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bar(y, 5);
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break;
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}
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}
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// CHECK-LABEL: @switch_bypass
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void switch_bypass(int n) {
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switch (n) {
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case 1:
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n = n;
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// O2-NOT: @llvm.lifetime.start.p0i8(i64 1
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// O2-NOT: @llvm.lifetime.end.p0i8(i64 1
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char x;
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bar(&x, 1);
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break;
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case 2:
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bar(&x, 1);
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break;
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}
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}
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// CHECK-LABEL: @indirect_jump
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void indirect_jump(int n) {
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char x;
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// O2-NOT: @llvm.lifetime
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void *T[] = {&&L};
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goto *T[n];
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L:
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bar(&x, 1);
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}
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// O2-LABEL: @jump_backward_over_declaration(
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// O2: %[[p:.*]] = alloca i32*
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// O2: %[[v0:.*]] = bitcast i32** %[[p]] to i8*
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// O2: call void @llvm.lifetime.start.p0i8(i64 {{.*}}, i8* %[[v0]])
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// O2-NOT: call void @llvm.lifetime.start.p0i8(
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extern void foo2(int p);
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int jump_backward_over_declaration(int a) {
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int *p = 0;
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label1:
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if (p) {
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foo2(*p);
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return 0;
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}
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int i = 999;
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if (a != 2) {
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p = &i;
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goto label1;
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}
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return -1;
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}
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