forked from OSchip/llvm-project
94 lines
3.0 KiB
C
94 lines
3.0 KiB
C
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -O1 -S -emit-llvm -o - %s | FileCheck %s --check-prefix=O1
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// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -O0 -S -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.
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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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struct S bar() {
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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: call void @llvm.lifetime.start.p0i8({{[^,]*}}, i8* nonnull %[[TMP1:[^)]+]])
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// O1: call void @foo
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r = foo();
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// O1: call void @llvm.lifetime.end.p0i8({{[^,]*}}, i8* nonnull %[[TMP1]])
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// O1: call void @llvm.lifetime.start.p0i8({{[^,]*}}, i8* nonnull %[[TMP2:[^)]+]])
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// O1: call void @foo
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r = foo();
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// O1: call void @llvm.lifetime.end.p0i8({{[^,]*}}, i8* nonnull %[[TMP2]])
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// O1: call void @llvm.lifetime.start.p0i8({{[^,]*}}, i8* nonnull %[[TMP3:[^)]+]])
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// O1: call void @foo
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r = foo();
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// O1: call void @llvm.lifetime.end.p0i8({{[^,]*}}, i8* nonnull %[[TMP3]])
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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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// Since this function turns out to be large-ish, optnone to hopefully keep it
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// stable.
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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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// O1: br label %[[DO_BODY:.+]]
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do {
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// O1: [[DO_BODY]]:
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// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP1_ALLOCA]] to i8*
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// O1: call void @llvm.lifetime.start.p0i8({{[^,]*}}, i8* %[[P]])
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// O1: br i1 {{[^,]+}}, label %[[IF_THEN:[^,]+]], label %[[IF_END:[^,]+]]
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//
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// O1: [[IF_THEN]]:
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// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP1_ALLOCA]] to i8*
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// O1: call void @llvm.lifetime.end.p0i8({{[^,]*}}, i8* %[[P]])
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// O1: br label %[[DO_END:.*]]
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//
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// O1: [[IF_END]]:
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// O1: call void @foo_int(%struct.S* sret %[[TMP1_ALLOCA]],
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// O1: call void @llvm.memcpy
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// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP1_ALLOCA]] to i8*
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// O1: call void @llvm.lifetime.end.p0i8({{[^,]*}}, i8* %[[P]])
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// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP2_ALLOCA]] to i8*
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// O1: call void @llvm.lifetime.start.p0i8({{[^,]*}}, i8* %[[P]])
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// O1: call void @foo_int(%struct.S* sret %[[TMP2_ALLOCA]],
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// O1: call void @llvm.memcpy
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// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP2_ALLOCA]] to i8*
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// O1: call void @llvm.lifetime.end.p0i8({{[^,]*}}, i8* %[[P]])
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// O1: br label %[[DO_COND:.*]]
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//
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// O1: [[DO_COND]]:
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// O1: br label %[[DO_BODY]]
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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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// O1: [[DO_END]]:
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// O1-NEXT: ret void
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return r;
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}
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