derek.holloway
7502bf64a4
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50 lines
1.6 KiB
LLVM
50 lines
1.6 KiB
LLVM
; RUN: opt -S -passes=mergefunc < %s | FileCheck %s -implicit-check-not=funA -implicit-check-not=funC
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; Replacments should be totally ordered on the function name.
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; If we don't do this we can end up with one module defining a thunk for @funA
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; and another module defining a thunk for @funB.
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; The problem with this is that the linker could then choose these two stubs
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; each of the two modules and we end up with two stubs calling each other.
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define linkonce_odr i32 @funC(i32 %x, i32 %y) {
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%sum = add i32 %x, %y
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%sum2 = add i32 %x, %sum
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%sum3 = add i32 %x, %sum2
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ret i32 %sum3
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}
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define linkonce_odr i32 @funB(i32 %x, i32 %y) {
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%sum = add i32 %x, %y
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%sum2 = add i32 %x, %sum
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%sum3 = add i32 %x, %sum2
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ret i32 %sum3
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}
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define linkonce_odr i32 @funA(i32 %x, i32 %y) {
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%sum = add i32 %x, %y
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%sum2 = add i32 %x, %sum
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%sum3 = add i32 %x, %sum2
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ret i32 %sum3
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}
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; This creates a use of @funB, preventing -passes=mergefunc from deleting it.
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; @funC, however, can safely be deleted as it has no uses, and is discardable
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; if unused.
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@take_addr_of_funB = global ptr @funB
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;.
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; CHECK: @take_addr_of_funB = global ptr @funB
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;.
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; CHECK-LABEL: define private i32 @0(
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; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
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; CHECK-NEXT: [[SUM:%.*]] = add i32 [[X]], [[Y]]
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; CHECK-NEXT: [[SUM2:%.*]] = add i32 [[X]], [[SUM]]
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; CHECK-NEXT: [[SUM3:%.*]] = add i32 [[X]], [[SUM2]]
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; CHECK-NEXT: ret i32 [[SUM3]]
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;
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;
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; CHECK-LABEL: define linkonce_odr i32 @funB(
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; CHECK-SAME: i32 [[TMP0:%.*]], i32 [[TMP1:%.*]]) {
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; CHECK-NEXT: [[TMP3:%.*]] = tail call i32 @0(i32 [[TMP0]], i32 [[TMP1]])
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; CHECK-NEXT: ret i32 [[TMP3]]
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;
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