158d72d728
Set the writable and dead_on_unwind attributes for sret arguments. These indicate that the argument points to writable memory (and it's legal to introduce spurious writes to it on entry to the function) and that the argument memory will not be used if the call unwinds. This enables additional MemCpyOpt/DSE/LICM optimizations.
105 lines
4.1 KiB
C++
105 lines
4.1 KiB
C++
// RUN: %clang_cc1 -no-enable-noundef-analysis -O1 -triple wasm32-unknown-unknown -emit-llvm -o - %s \
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// RUN: | FileCheck %s
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// RUN: %clang_cc1 -no-enable-noundef-analysis -O1 -triple wasm64-unknown-unknown -emit-llvm -o - %s \
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// RUN: | FileCheck %s
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#define concat_(x, y) x##y
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#define concat(x, y) concat_(x, y)
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#define test(T) \
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T forward(T x) { return x; } \
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void use(T x); \
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T concat(def_, T)(void); \
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void concat(test_, T)(void) { use(concat(def_, T)()); }
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struct one_field {
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double d;
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};
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test(one_field);
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// CHECK: define double @_Z7forward9one_field(double returned %{{.*}})
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//
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// CHECK: define void @_Z14test_one_fieldv()
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// CHECK: %[[call:.*]] = tail call double @_Z13def_one_fieldv()
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// CHECK: call void @_Z3use9one_field(double %[[call]])
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// CHECK: ret void
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//
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// CHECK: declare void @_Z3use9one_field(double)
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// CHECK: declare double @_Z13def_one_fieldv()
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struct two_fields {
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double d, e;
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};
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test(two_fields);
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// CHECK: define void @_Z7forward10two_fields(ptr dead_on_unwind noalias nocapture writable writeonly sret(%struct.two_fields) align 8 %{{.*}}, ptr nocapture readonly byval(%struct.two_fields) align 8 %{{.*}})
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//
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// CHECK: define void @_Z15test_two_fieldsv()
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// CHECK: %[[tmp:.*]] = alloca %struct.two_fields, align 8
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// CHECK: call void @_Z14def_two_fieldsv(ptr dead_on_unwind nonnull writable sret(%struct.two_fields) align 8 %[[tmp]])
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// CHECK: call void @_Z3use10two_fields(ptr nonnull byval(%struct.two_fields) align 8 %[[tmp]])
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// CHECK: ret void
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//
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// CHECK: declare void @_Z3use10two_fields(ptr byval(%struct.two_fields) align 8)
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// CHECK: declare void @_Z14def_two_fieldsv(ptr dead_on_unwind writable sret(%struct.two_fields) align 8)
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struct copy_ctor {
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double d;
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copy_ctor(copy_ctor const &);
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};
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test(copy_ctor);
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// CHECK: define void @_Z7forward9copy_ctor(ptr dead_on_unwind noalias {{[^,]*}} sret(%struct.copy_ctor) align 8 %{{.*}}, ptr nonnull %{{.*}})
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//
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// CHECK: declare ptr @_ZN9copy_ctorC1ERKS_(ptr {{[^,]*}} returned {{[^,]*}}, ptr nonnull align 8 dereferenceable(8))
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//
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// CHECK: define void @_Z14test_copy_ctorv()
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// CHECK: %[[tmp:.*]] = alloca %struct.copy_ctor, align 8
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// CHECK: call void @_Z13def_copy_ctorv(ptr dead_on_unwind nonnull writable sret(%struct.copy_ctor) align 8 %[[tmp]])
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// CHECK: call void @_Z3use9copy_ctor(ptr nonnull %[[tmp]])
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// CHECK: ret void
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//
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// CHECK: declare void @_Z3use9copy_ctor(ptr)
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// CHECK: declare void @_Z13def_copy_ctorv(ptr dead_on_unwind writable sret(%struct.copy_ctor) align 8)
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struct __attribute__((aligned(16))) aligned_copy_ctor {
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double d, e;
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aligned_copy_ctor(aligned_copy_ctor const &);
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};
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test(aligned_copy_ctor);
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// CHECK: define void @_Z7forward17aligned_copy_ctor(ptr dead_on_unwind noalias {{[^,]*}} sret(%struct.aligned_copy_ctor) align 16 %{{.*}}, ptr nonnull %{{.*}})
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//
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// CHECK: declare ptr @_ZN17aligned_copy_ctorC1ERKS_(ptr {{[^,]*}} returned {{[^,]*}}, ptr nonnull align 16 dereferenceable(16))
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//
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// CHECK: define void @_Z22test_aligned_copy_ctorv()
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// CHECK: %[[tmp:.*]] = alloca %struct.aligned_copy_ctor, align 16
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// CHECK: call void @_Z21def_aligned_copy_ctorv(ptr dead_on_unwind nonnull writable sret(%struct.aligned_copy_ctor) align 16 %[[tmp]])
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// CHECK: call void @_Z3use17aligned_copy_ctor(ptr nonnull %[[tmp]])
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// CHECK: ret void
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//
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// CHECK: declare void @_Z3use17aligned_copy_ctor(ptr)
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// CHECK: declare void @_Z21def_aligned_copy_ctorv(ptr dead_on_unwind writable sret(%struct.aligned_copy_ctor) align 16)
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struct empty {};
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test(empty);
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// CHECK: define void @_Z7forward5empty()
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//
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// CHECK: define void @_Z10test_emptyv()
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// CHECK: call void @_Z9def_emptyv()
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// CHECK: call void @_Z3use5empty()
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// CHECK: ret void
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//
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// CHECK: declare void @_Z3use5empty()
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// CHECK: declare void @_Z9def_emptyv()
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struct one_bitfield {
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int d : 3;
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};
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test(one_bitfield);
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// CHECK: define i32 @_Z7forward12one_bitfield(i32 returned %{{.*}})
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//
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// CHECK: define void @_Z17test_one_bitfieldv()
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// CHECK: %[[call:.*]] = tail call i32 @_Z16def_one_bitfieldv()
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// CHECK: call void @_Z3use12one_bitfield(i32 %[[call]])
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// CHECK: ret void
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//
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// CHECK: declare void @_Z3use12one_bitfield(i32)
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// CHECK: declare i32 @_Z16def_one_bitfieldv()
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