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We don't want to replace function A by Function B in one module and Function B by Function A in another module. If these functions are marked with linkonce_odr we would end up with a function stub calling B in one module and a function stub calling A in another module. If the linker decides to pick these two we will have two stubs calling each other. rdar://21265586 llvm-svn: 239367
31 lines
891 B
LLVM
31 lines
891 B
LLVM
; RUN: opt -S -mergefunc < %s | FileCheck %s
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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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;
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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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; CHECK-LABEL: define linkonce_odr i32 @funA
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; CHECK-NEXT: add
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; CHECK: ret
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; CHECK-LABEL: define linkonce_odr i32 @funB
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; CHECK-NEXT: tail call i32 @funA(i32 %0, i32 %1)
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; CHECK-NEXT: ret
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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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