6b3351792c
For a definition (of most linkage types), dso_local is set for ELF -fno-pic/-fpie
and COFF, but not for Mach-O. This nuance causes unneeded binary format differences.
This patch replaces (function) `define ` with `define{{.*}} `,
(variable/constant/alias) `= ` with `={{.*}} `, or inserts appropriate `{{.*}} `
if there is an explicit linkage.
* Clang will set dso_local for Mach-O, which is currently implied by TargetMachine.cpp. This will make COFF/Mach-O and executable ELF similar.
* Eventually I hope we can make dso_local the textual LLVM IR default (write explicit "dso_preemptable" when applicable) and -fpic ELF will be similar to everything else. This patch helps move toward that goal.
54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
// RUN: %clang_cc1 -emit-llvm -triple x86_64-apple-darwin10 < %s | FileCheck %s
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struct Test1S {
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long NumDecls;
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long X;
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long Y;
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};
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struct Test2S {
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long NumDecls;
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long X;
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};
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// Make sure we don't generate extra memcpy for lvalues
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void test1a(struct Test1S, struct Test2S);
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// CHECK-LABEL: define{{.*}} void @test1(
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// CHECK-NOT: memcpy
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// CHECK: call void @test1a
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void test1(struct Test1S *A, struct Test2S *B) {
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test1a(*A, *B);
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}
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// The above gets tricker when the byval argument requires higher alignment
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// than the natural alignment of the type in question.
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// rdar://9483886
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// Make sure we do generate a memcpy when we cannot guarantee alignment.
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struct Test3S {
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int a,b,c,d,e,f,g,h,i,j,k,l;
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};
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void test2a(struct Test3S q);
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// CHECK-LABEL: define{{.*}} void @test2(
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// CHECK: alloca %struct.Test3S, align 8
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// CHECK: memcpy
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// CHECK: call void @test2a
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void test2(struct Test3S *q) {
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test2a(*q);
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}
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// But make sure we don't generate a memcpy when we can guarantee alignment.
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void fooey(void);
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// CHECK-LABEL: define{{.*}} void @test3(
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// CHECK: alloca %struct.Test3S, align 8
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// CHECK: call void @fooey
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// CHECK-NOT: memcpy
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// CHECK: call void @test2a
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// CHECK-NOT: memcpy
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// CHECK: call void @test2a
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void test3(struct Test3S a) {
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struct Test3S b = a;
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fooey();
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test2a(a);
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test2a(b);
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}
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