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# This checks that shrink wrapping correctly drops moving push/pops when
# there is a MOV instruction loading the value of the stack pointer in
# order to do pointer arithmetic with a stack address.
# REQUIRES: system-linux
# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \
# RUN: %s -o %t.o
# RUN: link_fdata %s %t.o %t.fdata
# RUN: llvm-strip --strip-unneeded %t.o
# RUN: ld.lld %t.o -o %t.exe -q
# RUN: llvm-bolt %t.exe -relocs -o %t.out -data %t.fdata \
# RUN: -frame-opt=all -simplify-conditional-tail-calls=false \
# RUN: -experimental-shrink-wrapping \
# RUN: -eliminate-unreachable=false | FileCheck %s
.globl _start
.type _start, %function
_start:
.cfi_startproc
# FDATA: 0 [unknown] 0 1 _start 0 0 1
push %rbp
mov %rsp, %rbp
push %rbx
push %r14
subq $0x20, %rsp
je b
c:
addq $0x20, %rsp
pop %r14
pop %rbx
pop %rbp
ret
b:
je f
jmp *JT(,%rdi,8)
d:
mov %r14, %rdi
mov %rbx, %rdi
mov %rbp, %rdi
sub 0x20, %rdi
f:
addq $0x20, %rsp
pop %r14
pop %rbx
pop %rbp
ret
.cfi_endproc
.size _start, .-_start
.data
JT:
.quad c
.quad d
.quad f
# CHECK: BOLT-INFO: Shrink wrapping moved 2 spills inserting load/stores and 0 spills inserting push/pops
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