derek.holloway
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84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -O1 -emit-llvm -o - %s | FileCheck %s --check-prefixes=O1
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// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -O0 -emit-llvm -o - %s | FileCheck %s --check-prefix=O0
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//
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// Ensure that we place appropriate lifetime markers around indirectly returned
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// temporaries, and that the lifetime.ends appear in a timely manner.
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//
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// -O1 is used so lifetime markers actually get emitted and optnone is added
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// to avoid elimination of lifetime markers by optimizations.
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struct S {
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int ns[40];
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};
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struct S foo(void);
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// CHECK-LABEL: define dso_local void @bar
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__attribute__((optnone))
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struct S bar(void) {
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// O0-NOT: @llvm.lifetime.start
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// O0-NOT: @llvm.lifetime.end
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struct S r;
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// O1: %[[TMP1_ALLOCA:[^ ]+]] = alloca %struct.S
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// O1: %[[TMP2_ALLOCA:[^ ]+]] = alloca %struct.S
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// O1: %[[TMP3_ALLOCA:[^ ]+]] = alloca %struct.S
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// O1: call void @llvm.lifetime.start.p0(ptr %[[TMP1_ALLOCA]])
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// O1: call void @foo
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r = foo();
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// O1: memcpy
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// O1: call void @llvm.lifetime.end.p0(ptr %[[TMP1_ALLOCA]])
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// O1: call void @llvm.lifetime.start.p0(ptr %[[TMP2_ALLOCA]])
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// O1: call void @foo
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r = foo();
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// O1: memcpy
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// O1: call void @llvm.lifetime.end.p0(ptr %[[TMP2_ALLOCA]])
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// O1: call void @llvm.lifetime.start.p0(ptr %[[TMP3_ALLOCA]])
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// O1: call void @foo
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r = foo();
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// O1: memcpy
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// O1: call void @llvm.lifetime.end.p0(ptr %[[TMP3_ALLOCA]])
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return r;
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}
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struct S foo_int(int);
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// Be sure that we're placing the lifetime.end so that all paths go through it.
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// CHECK-LABEL: define dso_local void @baz
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__attribute__((optnone))
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struct S baz(int i, volatile int *j) {
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// O0-NOT: @llvm.lifetime.start
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// O0-NOT: @llvm.lifetime.end
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struct S r;
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// O1: %[[TMP1_ALLOCA:[^ ]+]] = alloca %struct.S
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// O1: %[[TMP2_ALLOCA:[^ ]+]] = alloca %struct.S
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do {
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// O1: call void @llvm.lifetime.start.p0(ptr %[[TMP1_ALLOCA]])
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//
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// O1: call void @llvm.lifetime.end.p0(ptr %[[TMP1_ALLOCA]])
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//
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// O1: call void @foo_int(ptr dead_on_unwind writable sret(%struct.S) align 4 %[[TMP1_ALLOCA]],
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// O1: call void @llvm.memcpy
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// O1: call void @llvm.lifetime.end.p0(ptr %[[TMP1_ALLOCA]])
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// O1: call void @llvm.lifetime.start.p0(ptr %[[TMP2_ALLOCA]])
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// O1: call void @foo_int(ptr dead_on_unwind writable sret(%struct.S) align 4 %[[TMP2_ALLOCA]],
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// O1: call void @llvm.memcpy
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// O1: call void @llvm.lifetime.end.p0(ptr %[[TMP2_ALLOCA]])
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r = foo_int(({
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if (*j)
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break;
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i++;
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}));
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r = foo_int(i++);
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} while (1);
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return r;
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}
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