forked from OSchip/llvm-project
56 lines
1.7 KiB
ArmAsm
56 lines
1.7 KiB
ArmAsm
# This checks that shrink wrapping does attempt at accessing stack elements
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# using RSP when the function is aligning RSP and changing offsets.
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# REQUIRES: system-linux
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \
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# RUN: %s -o %t.o
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# RUN: link_fdata %s %t.o %t.fdata
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# RUN: llvm-strip --strip-unneeded %t.o
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# RUN: %clang %cflags %t.o -o %t.exe -Wl,-q -nostdlib
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# RUN: llvm-bolt %t.exe -o %t.out --data %t.fdata \
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# RUN: --frame-opt=all --simplify-conditional-tail-calls=false \
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# RUN: --eliminate-unreachable=false | FileCheck %s
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# Here we have a function that aligns the stack at prologue. Stack pointer
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# analysis can't try to infer offset positions after AND because that depends
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# on the runtime value of the stack pointer of callee (whether it is misaligned
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# or not).
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.globl _start
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.type _start, %function
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_start:
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.cfi_startproc
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# FDATA: 0 [unknown] 0 1 _start 0 0 1
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push %rbp
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mov %rsp, %rbp
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push %rbx
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push %r14
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and $0xffffffffffffffe0,%rsp
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subq $0x20, %rsp
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b: je hot_path
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# FDATA: 1 _start #b# 1 _start #hot_path# 0 1
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cold_path:
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mov %r14, %rdi
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mov %rbx, %rdi
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# Block push-pop mode by using an instruction that requires the
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# stack to be aligned to 128B. This will force the pass
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# to try to index stack elements by using RSP +offset directly, but
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# we do not know how to access individual elements of the stack thanks
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# to the alignment.
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movdqa %xmm8, (%rsp)
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addq $0x20, %rsp
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pop %r14
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pop %rbx
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pop %rbp
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ret
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hot_path:
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addq $0x20, %rsp
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pop %r14
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pop %rbx
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pop %rbp
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ret
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.cfi_endproc
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.size _start, .-_start
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# CHECK: BOLT-INFO: Shrink wrapping moved 0 spills inserting load/stores and 0 spills inserting push/pops
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