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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.
117 lines
3.0 KiB
C++
117 lines
3.0 KiB
C++
// RUN: %clang_cc1 -triple i386-apple-darwin9 -emit-llvm -o - %s | FileCheck %s
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// Non-trivial dtors, should both be passed indirectly.
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struct S {
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~S();
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short s;
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};
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// CHECK-LABEL: define{{.*}} void @_Z1fv(ptr dead_on_unwind noalias writable sret(%struct.S) align 2 %
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S f() { return S(); }
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// CHECK-LABEL: define{{.*}} void @_Z1f1S(ptr noundef %0)
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void f(S) { }
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// Non-trivial dtors, should both be passed indirectly.
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class C {
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public:
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~C();
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double c;
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};
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// CHECK-LABEL: define{{.*}} void @_Z1gv(ptr dead_on_unwind noalias writable sret(%class.C) align 4 %
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C g() { return C(); }
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// CHECK-LABEL: define{{.*}} void @_Z1f1C(ptr noundef %0)
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void f(C) { }
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// PR7058 - Missing byval on MI thunk definition.
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// CHECK-LABEL: define{{.*}} void @_ZThn4_N18BasicAliasAnalysis13getModRefInfoE8CallSite
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// ...
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// CHECK: ptr noundef byval(%struct.CallSite) align 4 %CS)
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struct CallSite {
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unsigned Ptr;
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CallSite(unsigned XX) : Ptr(XX) {}
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};
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struct AliasAnalysis {
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virtual void xyz();
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virtual void getModRefInfo(CallSite CS) = 0;
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};
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struct ModulePass {
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virtual void xx();
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};
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struct BasicAliasAnalysis : public ModulePass, public AliasAnalysis {
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void getModRefInfo(CallSite CS);
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};
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void BasicAliasAnalysis::getModRefInfo(CallSite CS) {
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}
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// Check various single element struct type conditions.
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//
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// PR7098.
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// CHECK-LABEL: define{{.*}} i64 @_Z2f0v()
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struct s0_0 { int x; };
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struct s0_1 : s0_0 { int* y; };
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s0_1 f0() { return s0_1(); }
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// CHECK-LABEL: define{{.*}} i32 @_Z2f1v()
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struct s1_0 { int x; };
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struct s1_1 : s1_0 { };
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s1_1 f1() { return s1_1(); }
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// CHECK-LABEL: define{{.*}} double @_Z2f2v()
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struct s2_0 { double x; };
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struct s2_1 : s2_0 { };
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s2_1 f2() { return s2_1(); }
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// CHECK-LABEL: define{{.*}} double @_Z2f3v()
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struct s3_0 { };
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struct s3_1 { double x; };
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struct s3_2 : s3_0, s3_1 { };
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s3_2 f3() { return s3_2(); }
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// CHECK-LABEL: define{{.*}} i64 @_Z2f4v()
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struct s4_0 { float x; };
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struct s4_1 { float x; };
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struct s4_2 : s4_0, s4_1 { };
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s4_2 f4() { return s4_2(); }
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// CHECK-LABEL: define{{.*}} ptr @_Z2f5v()
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struct s5 { s5(); int &x; };
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s5 f5() { return s5(); }
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// CHECK-LABEL: define{{.*}} i32 @_Z4f6_0M2s6i(i32 %a)
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// CHECK: define{{.*}} i64 @_Z4f6_1M2s6FivE(ptr noundef byval({ i32, i32 }) align 4 %0)
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// FIXME: It would be nice to avoid byval on the previous case.
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struct s6 {};
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typedef int s6::* s6_mdp;
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typedef int (s6::*s6_mfp)();
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s6_mdp f6_0(s6_mdp a) { return a; }
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s6_mfp f6_1(s6_mfp a) { return a; }
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// CHECK-LABEL: define{{.*}} double @_Z2f7v()
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struct s7_0 { unsigned : 0; };
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struct s7_1 { double x; };
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struct s7 : s7_0, s7_1 { };
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s7 f7() { return s7(); }
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// CHECK-LABEL: define{{.*}} void @_Z2f8v(ptr dead_on_unwind noalias writable sret(%struct.s8) align 4 %agg.result)
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struct s8_0 { };
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struct s8_1 { double x; };
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struct s8 { s8_0 a; s8_1 b; };
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s8 f8() { return s8(); }
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// CHECK-LABEL: define{{.*}} void @_Z2f9v(ptr dead_on_unwind noalias writable sret(%struct.s9) align 4 %agg.result)
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struct s9_0 { unsigned : 0; };
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struct s9_1 { double x; };
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struct s9 { s9_0 a; s9_1 b; };
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s9 f9() { return s9(); }
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