icf-preemptible.s
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# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
# RUN: ld.lld -pie %t.o --icf=all --print-icf-sections -o /dev/null | \
# RUN: FileCheck --check-prefixes=EXE %s
# RUN: ld.lld -shared %t.o --icf=all --print-icf-sections -o /dev/null | \
# RUN: FileCheck --check-prefix=DSO %s --implicit-check-not=removing
## Definitions are non-preemptible in an executable.
# EXE: selected section {{.*}}:(.text.h1)
# EXE-NEXT: removing identical section {{.*}}:(.text.h2)
# EXE-NEXT: removing identical section {{.*}}:(.text.h3)
# EXE: selected section {{.*}}:(.text.f1)
# EXE-NEXT: removing identical section {{.*}}:(.text.f2)
# EXE-NEXT: selected section {{.*}}:(.text.g1)
# EXE: removing identical section {{.*}}:(.text.g2)
# EXE-NEXT: removing identical section {{.*}}:(.text.g3)
## Definitions are preemptible in a DSO. Only leaf functions can be folded.
# DSO: selected section {{.*}}:(.text.f1)
# DSO-NEXT: removing identical section {{.*}}:(.text.f2)
# DSO-NEXT: selected section {{.*}}:(.text.g1)
# DSO-NEXT: removing identical section {{.*}}:(.text.g3)
.globl f1, f2, g1, g2, g3
.section .text.f1
f1: ret
.section .text.f2
f2: ret
## In -shared mode, .text.g1 and .text.g2 cannot be folded because f1 and f2 are
## preemptible and may refer to different functions at runtime.
.section .text.g1
g1: jmp f1@plt
.section .text.g2
g2: jmp f2@plt
.section .text.g3
g3: jmp f1@plt
## In -shared mode, the sections below cannot be folded because g1, g2 and g3
## are preemptible and may refer to different functions at runtime.
.section .text.h1
jmp g1@plt
.section .text.h2
jmp g2@plt
.section .text.h3
jmp g3@plt