fd739804e0
For a default visibility external linkage definition, dso_local is set for ELF
-fno-pic/-fpie and COFF and Mach-O. Since default clang -cc1 for ELF is similar
to -fpic ("PIC Level" is not set), this nuance causes unneeded binary format differences.
To make emitted IR similar, ELF -cc1 -fpic will default to -fno-semantic-interposition,
which sets dso_local for default visibility external linkage definitions.
To make this flip smooth and enable future (dso_local as definition default),
this patch replaces (function) `define ` with `define{{.*}} `,
(variable/constant/alias) `= ` with `={{.*}} `, or inserts appropriate `{{.*}} `.
42 lines
1.0 KiB
C++
42 lines
1.0 KiB
C++
// For MSVC ABI compatibility, all structures returned by value using the
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// thiscall calling convention must use the hidden parameter.
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//
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// RUN: %clang_cc1 -triple i386-PC-Win32 %s -fms-compatibility -emit-llvm -o - | FileCheck %s
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// This structure would normally be returned via EAX
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struct S {
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int i;
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};
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// This structure would normally be returned via EAX/EDX
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struct M {
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int i;
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int j;
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};
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class C {
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public:
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C() {}
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struct S __attribute__((thiscall)) Small() const {
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struct S s = { 0 };
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return s;
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}
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struct M __attribute__((thiscall)) Medium() const {
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struct M m = { 0 };
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return m;
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}
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};
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// CHECK-LABEL: define{{.*}} void @_Z4testv()
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void test( void ) {
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// CHECK: call void @_ZN1CC1Ev(%class.C* {{[^,]*}} [[C:%.+]])
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C c;
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// CHECK: call x86_thiscallcc void @_ZNK1C5SmallEv(%struct.S* sret(%struct.S) align 4 %{{.+}}, %class.C* {{[^,]*}} [[C]])
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(void)c.Small();
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// CHECK: call x86_thiscallcc void @_ZNK1C6MediumEv(%struct.M* sret(%struct.M) align 4 %{{.+}}, %class.C* {{[^,]*}} [[C]])
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(void)c.Medium();
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}
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