1b1c8d83d3
Turning on `enable_noundef_analysis` flag allows better codegen by removing freeze instructions. I modified clang by renaming `enable_noundef_analysis` flag to `disable-noundef-analysis` and turning it off by default. Test updates are made as a separate patch: D108453 Reviewed By: eugenis Differential Revision: https://reviews.llvm.org/D105169
28 lines
703 B
C++
28 lines
703 B
C++
// RUN: %clang_cc1 -triple=i686 -emit-llvm -o - %s | FileCheck %s
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struct X;
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typedef void (X::*memptr)();
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struct A {
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virtual memptr f();
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};
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struct B {
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virtual memptr f();
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};
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struct C : A, B {
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C();
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memptr f() override __attribute__((noinline)) { return nullptr; };
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};
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C::C() {}
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// Make sure the member pointer is returned from the thunk via the return slot.
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// Because of the tail call, the return value cannot be copied into a local
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// alloca. (PR39901)
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// CHECK-LABEL: define linkonce_odr void @_ZThn4_N1C1fEv({ i32, i32 }* noalias sret({ i32, i32 }) align 4 %agg.result, %struct.C* noundef %this)
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// CHECK: tail call void @_ZN1C1fEv({ i32, i32 }* sret({ i32, i32 }) align 4 %agg.result
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