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.
221 lines
6.2 KiB
C++
221 lines
6.2 KiB
C++
// RUN: %clang_cc1 -no-enable-noundef-analysis -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
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// Basic base class test.
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struct f0_s0 { unsigned a; };
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struct f0_s1 : public f0_s0 { void *b; };
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// CHECK-LABEL: define{{.*}} void @_Z2f05f0_s1(i32 %a0.coerce0, ptr %a0.coerce1)
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void f0(f0_s1 a0) { }
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// Check with two eight-bytes in base class.
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struct f1_s0 { unsigned a; unsigned b; float c; };
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struct f1_s1 : public f1_s0 { float d;};
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// CHECK-LABEL: define{{.*}} void @_Z2f15f1_s1(i64 %a0.coerce0, <2 x float> %a0.coerce1)
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void f1(f1_s1 a0) { }
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// Check with two eight-bytes in base class and merge.
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struct f2_s0 { unsigned a; unsigned b; float c; };
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struct f2_s1 : public f2_s0 { char d;};
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// CHECK-LABEL: define{{.*}} void @_Z2f25f2_s1(i64 %a0.coerce0, i64 %a0.coerce1)
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void f2(f2_s1 a0) { }
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// PR5831
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// CHECK-LABEL: define{{.*}} void @_Z2f34s3_1(i64 %x.coerce)
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struct s3_0 {};
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struct s3_1 { struct s3_0 a; long b; };
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void f3(struct s3_1 x) {}
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// CHECK-LABEL: define{{.*}} i64 @_Z4f4_0M2s4i(i64 %a)
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// CHECK: define {{.*}} @_Z4f4_1M2s4FivE(i64 %a.coerce0, i64 %a.coerce1)
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struct s4 {};
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typedef int s4::* s4_mdp;
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typedef int (s4::*s4_mfp)();
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s4_mdp f4_0(s4_mdp a) { return a; }
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s4_mfp f4_1(s4_mfp a) { return a; }
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// A struct with <= one eightbyte before a member data pointer should still
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// be allowed in registers.
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// CHECK-LABEL: define{{.*}} void @{{.*}}f_struct_with_mdp{{.*}}(ptr %a.coerce0, i64 %a.coerce1)
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struct struct_with_mdp { char *a; s4_mdp b; };
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void f_struct_with_mdp(struct_with_mdp a) { (void)a; }
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// A struct with anything before a member function will be too big and
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// goes in memory.
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// CHECK-LABEL: define{{.*}} void @{{.*}}f_struct_with_mfp_0{{.*}}(ptr byval(%struct{{.*}}) align 8 %a)
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struct struct_with_mfp_0 { char a; s4_mfp b; };
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void f_struct_with_mfp_0(struct_with_mfp_0 a) { (void)a; }
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// CHECK-LABEL: define{{.*}} void @{{.*}}f_struct_with_mfp_1{{.*}}(ptr byval(%struct{{.*}}) align 8 %a)
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struct struct_with_mfp_1 { void *a; s4_mfp b; };
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void f_struct_with_mfp_1(struct_with_mfp_1 a) { (void)a; }
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namespace PR7523 {
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struct StringRef {
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char *a;
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};
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void AddKeyword(StringRef, int x);
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void foo() {
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// CHECK-LABEL: define{{.*}} void @_ZN6PR75233fooEv()
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// CHECK: call void @_ZN6PR752310AddKeywordENS_9StringRefEi(ptr {{.*}}, i32 4)
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AddKeyword(StringRef(), 4);
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}
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}
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namespace PR7742 {
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struct s2 {
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float a[2];
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};
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struct c2 : public s2 {};
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// CHECK-LABEL: define{{.*}} <2 x float> @_ZN6PR77423fooEPNS_2c2E(ptr %P)
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c2 foo(c2 *P) {
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return c2();
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}
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}
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namespace PR5179 {
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struct B {};
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struct B1 : B {
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int* pa;
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};
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struct B2 : B {
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B1 b1;
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};
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// CHECK-LABEL: define{{.*}} ptr @_ZN6PR51793barENS_2B2E(ptr %b2.coerce)
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const void *bar(B2 b2) {
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return b2.b1.pa;
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}
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}
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namespace test5 {
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struct Xbase { };
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struct Empty { };
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struct Y;
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struct X : public Xbase {
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Empty empty;
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Y f();
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};
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struct Y : public X {
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Empty empty;
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};
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X getX();
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int takeY(const Y&, int y);
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void g() {
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// The temporary for the X object needs to have a defined address when
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// passed into X::f as 'this'.
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takeY(getX().f(), 42);
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}
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// CHECK: void @_ZN5test51gEv()
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// CHECK: alloca %"struct.test5::Y"
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// CHECK: alloca %"struct.test5::X"
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// CHECK: alloca %"struct.test5::Y"
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}
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namespace test6 {
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struct outer {
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int x;
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struct epsilon_matcher {} e;
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int f;
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};
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int test(outer x) {
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return x.x + x.f;
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}
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// CHECK-LABEL: define{{.*}} i32 @_ZN5test64testENS_5outerE(i64 %x.coerce0, i32 %x.coerce1)
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}
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namespace test7 {
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struct StringRef {char* ptr; long len; };
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class A { public: ~A(); };
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A x(A, A, long, long, StringRef) { return A(); }
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// Check that the StringRef is passed byval instead of expanded
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// (which would split it between registers and memory).
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// CHECK: define{{.*}} void @_ZN5test71xENS_1AES0_llNS_9StringRefE({{.*}} byval({{.*}}) align 8 {{%.*}})
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// And a couple extra related tests:
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A y(A, long double, long, long, StringRef) { return A(); }
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// CHECK: define{{.*}} void @_ZN5test71yENS_1AEellNS_9StringRefE({{.*}} ptr
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struct StringDouble {char * ptr; double d;};
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A z(A, A, A, A, A, StringDouble) { return A(); }
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A zz(A, A, A, A, StringDouble) { return A(); }
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// CHECK: define{{.*}} void @_ZN5test71zENS_1AES0_S0_S0_S0_NS_12StringDoubleE({{.*}} byval({{.*}}) align 8 {{%.*}})
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// CHECK: define{{.*}} void @_ZN5test72zzENS_1AES0_S0_S0_NS_12StringDoubleE({{.*}} ptr
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}
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namespace test8 {
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// CHECK: declare void @_ZN5test83fooENS_1BE(ptr byval(%"class.test8::B") align 8)
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class A {
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char big[17];
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};
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class B : public A {};
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void foo(B b);
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void bar() {
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B b;
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foo(b);
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}
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}
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// PR4242
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namespace test9 {
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// Large enough to be passed indirectly.
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struct S { void *data[3]; };
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struct T { void *data[2]; };
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// CHECK: define{{.*}} void @_ZN5test93fooEPNS_1SEPNS_1TE(ptr %0, ptr %1)
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void foo(S*, T*) {}
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// CHECK: define{{.*}} void @_ZN5test91aEiiiiNS_1TEPv(ptr dead_on_unwind noalias writable sret([[S:%.*]]) align 8 {{%.*}}, i32 %0, i32 %1, i32 %2, i32 %3, ptr byval([[T:%.*]]) align 8 %4, ptr %5)
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S a(int, int, int, int, T, void*) {
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return S();
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}
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// CHECK: define{{.*}} ptr @_ZN5test91bEPNS_1SEiiiiNS_1TEPv(ptr {{%.*}}, i32 %0, i32 %1, i32 %2, i32 %3, ptr byval([[T]]) align 8 %4, ptr %5)
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S* b(S* sret, int, int, int, int, T, void*) {
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return sret;
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}
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// CHECK: define{{.*}} void @_ZN5test91cEiiiNS_1TEPv(ptr dead_on_unwind noalias writable sret([[S]]) align 8 {{%.*}}, i32 %0, i32 %1, i32 %2, ptr {{%.*}}, ptr {{%.*}}, ptr %3)
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S c(int, int, int, T, void*) {
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return S();
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}
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// CHECK: define{{.*}} ptr @_ZN5test91dEPNS_1SEiiiNS_1TEPv(ptr {{%.*}}, i32 %0, i32 %1, i32 %2, ptr {{%.*}}, ptr {{%.*}}, ptr %3)
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S* d(S* sret, int, int, int, T, void*) {
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return sret;
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}
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}
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namespace test10 {
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#pragma pack(1)
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struct BasePacked {
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char one;
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short two;
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};
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#pragma pack()
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struct DerivedPacked : public BasePacked {
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int three;
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};
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// CHECK-LABEL: define{{.*}} i32 @_ZN6test1020FuncForDerivedPackedENS_13DerivedPackedE(ptr byval({{.*}}) align 8
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int FuncForDerivedPacked(DerivedPacked d) {
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return d.three;
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}
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}
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namespace test11 {
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union U {
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float f1;
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char __attribute__((__vector_size__(1))) f2;
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};
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int f(union U u) { return u.f2[1]; }
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// CHECK-LABEL: define{{.*}} i32 @_ZN6test111fENS_1UE(i32
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}
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