derek.holloway
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95 lines
2.1 KiB
ArmAsm
95 lines
2.1 KiB
ArmAsm
## Check that llvm-bolt successfully relaxes branches for compact (<128MB) code
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## model.
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# REQUIRES: system-linux
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# RUN: llvm-mc -filetype=obj -triple aarch64-unknown-unknown %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 -static
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# RUN: llvm-bolt %t.exe -o %t.bolt --data %t.fdata --split-functions \
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# RUN: --keep-nops --compact-code-model
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# RUN: llvm-objdump -d \
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# RUN: --disassemble-symbols=_start,_start.cold.0,foo,foo.cold.0 %t.bolt \
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# RUN: | FileCheck %s
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# RUN: llvm-nm -nS %t.bolt | FileCheck %s --check-prefix=CHECK-NM
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## Fragments of _start and foo will be separated by large_function which is over
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## 1MB in size - larger than all conditional branches can cover requiring branch
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## relaxation.
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# CHECK-NM: _start
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# CHECK-NM: foo
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# CHECK-NM: 0000000000124f84 T large_function
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# CHECK-NM: _start.cold.0
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# CHECK-NM: foo.cold.0
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.text
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.globl _start
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.type _start, %function
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_start:
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# CHECK: <_start>:
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# FDATA: 0 [unknown] 0 1 _start 0 0 100
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.cfi_startproc
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cmp x0, 1
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b.eq .L0
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# CHECK: b.eq
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# CHECK-NEXT: b
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# CHECK-NEXT: b
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bl large_function
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.L0:
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ret x30
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.cfi_endproc
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.size _start, .-_start
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## Check that long branch in foo() is reused during relaxation. I.e. we should
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## see just one branch to the cold fragment.
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.globl foo
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.type foo, %function
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foo:
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# CHECK: <foo>:
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# FDATA: 0 [unknown] 0 1 foo 0 0 100
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.cfi_startproc
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cmp x0, 0
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.T0:
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b.eq .ERROR
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# CHECK: b {{.*}} <foo.cold.0>
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# CHECK-NOT: b {{.*}} <foo.cold.0>
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# FDATA: 1 foo #.T0# 1 foo #.T1# 0 100
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.T1:
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bl large_function
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cmp x0, 1
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.T2:
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b.eq .ERROR
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# FDATA: 1 foo #.T2# 1 foo #.T3# 0 100
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.T3:
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mov x1, x0
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mov x0, 0
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ret x30
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# CHECK: <foo.cold.0>:
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# CHECK-NEXT: mov x0, #0x1
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# CHECK-NEXT: ret
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.ERROR:
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mov x0, 1
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ret x30
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.cfi_endproc
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.size foo, .-foo
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.globl large_function
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.type large_function, %function
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large_function:
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# FDATA: 0 [unknown] 0 1 large_function 0 0 100
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.cfi_startproc
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.rept 300000
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nop
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.endr
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ret x30
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.cfi_endproc
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.size large_function, .-large_function
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## Force relocation mode.
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.reloc 0, R_AARCH64_NONE
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