6f54fb0052
The MergeFunctions pass was originally intended to emit aliases instead of thunks where possible (unnamed_addr). However, for a long time this functionality was behind a flag hardcoded to false, bitrotted and was eventually removed in r309313. Originally the functionality was first disabled in r108417 due to lack of support for aliases in Mach-O. I believe that this is no longer the case nowadays, but not really familiar with this area. In the interest of being conservative, this patch reintroduces the aliasing functionality behind a default disabled -mergefunc-use-aliases flag. Differential Revision: https://reviews.llvm.org/D53285 llvm-svn: 347407
117 lines
3.5 KiB
LLVM
117 lines
3.5 KiB
LLVM
; RUN: opt -S -mergefunc -mergefunc-use-aliases < %s | FileCheck %s
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; Aliases should always be created for the weak functions, and
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; for external functions if there is no local function
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; CHECK: @external_external_2 = unnamed_addr alias void (float*), bitcast (void (i32*)* @external_external_1 to void (float*)*)
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; CHECK: @weak_weak_2 = weak unnamed_addr alias void (float*), bitcast (void (i32*)* @0 to void (float*)*)
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; CHECK: @weak_weak_1 = weak unnamed_addr alias void (i32*), void (i32*)* @0
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; CHECK: @weak_external_1 = weak unnamed_addr alias void (i32*), bitcast (void (float*)* @weak_external_2 to void (i32*)*)
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; CHECK: @external_weak_2 = weak unnamed_addr alias void (float*), bitcast (void (i32*)* @external_weak_1 to void (float*)*)
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; CHECK: @weak_internal_1 = weak unnamed_addr alias void (i32*), bitcast (void (float*)* @weak_internal_2 to void (i32*)*)
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; CHECK: @internal_weak_2 = weak unnamed_addr alias void (float*), bitcast (void (i32*)* @internal_weak_1 to void (float*)*)
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; A strong backing function had to be created for the weak-weak pair
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; CHECK: define private void @0(i32* %a) unnamed_addr
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; CHECK_NEXT: call void @dummy4()
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; These internal functions are dropped in favor of the external ones
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; CHECK-NOT: define internal void @external_internal_2(float *%a) unnamed_addr
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; CHECK-NOT: define internal void @internal_external_1(i32 *%a) unnamed_addr
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; CHECK-NOT: define internal void @internal_external_1(i32 *%a) unnamed_addr
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; CHECK-NOT: define internal void @internal_external_2(float *%a) unnamed_addr
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; Only used to mark which functions should be merged.
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declare void @dummy1()
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declare void @dummy2()
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declare void @dummy3()
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declare void @dummy4()
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declare void @dummy5()
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declare void @dummy6()
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declare void @dummy7()
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declare void @dummy8()
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declare void @dummy9()
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define void @external_external_1(i32 *%a) unnamed_addr {
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call void @dummy1()
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ret void
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}
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define void @external_external_2(float *%a) unnamed_addr {
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call void @dummy1()
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ret void
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}
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define void @external_internal_1(i32 *%a) unnamed_addr {
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call void @dummy2()
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ret void
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}
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define internal void @external_internal_2(float *%a) unnamed_addr {
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call void @dummy2()
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ret void
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}
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define internal void @internal_external_1(i32 *%a) unnamed_addr {
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call void @dummy3()
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ret void
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}
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define void @internal_external_2(float *%a) unnamed_addr {
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call void @dummy3()
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ret void
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}
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define weak void @weak_weak_1(i32 *%a) unnamed_addr {
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call void @dummy4()
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ret void
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}
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define weak void @weak_weak_2(float *%a) unnamed_addr {
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call void @dummy4()
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ret void
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}
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define weak void @weak_external_1(i32 *%a) unnamed_addr {
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call void @dummy5()
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ret void
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}
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define external void @weak_external_2(float *%a) unnamed_addr {
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call void @dummy5()
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ret void
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}
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define external void @external_weak_1(i32 *%a) unnamed_addr {
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call void @dummy6()
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ret void
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}
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define weak void @external_weak_2(float *%a) unnamed_addr {
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call void @dummy6()
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ret void
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}
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define weak void @weak_internal_1(i32 *%a) unnamed_addr {
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call void @dummy7()
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ret void
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}
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define internal void @weak_internal_2(float *%a) unnamed_addr {
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call void @dummy7()
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ret void
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}
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define internal void @internal_weak_1(i32 *%a) unnamed_addr {
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call void @dummy8()
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ret void
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}
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define weak void @internal_weak_2(float *%a) unnamed_addr {
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call void @dummy8()
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ret void
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}
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define internal void @internal_internal_1(i32 *%a) unnamed_addr {
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call void @dummy9()
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ret void
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}
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define internal void @internal_internal_2(float *%a) unnamed_addr {
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call void @dummy9()
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ret void
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}
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