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llvm-project/lld/test/ELF/compressed-debug-level.test

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[LLD][ELF] - Make compression level be dependent on -On. Currently LLD always use zlib compression level 6. This patch changes it to use 1 for -O0, -O1 and 6 for -O2. It fixes https://bugs.llvm.org/show_bug.cgi?id=44089. There was also a thread in llvm-dev on this topic: https://lists.llvm.org/pipermail/llvm-dev/2018-August/125020.html Here is a table with results of building clang mentioned there: ``` Level Time Size 0 0m17.128s 2045081496 Z_NO_COMPRESSION 1 0m31.471s 922618584 Z_BEST_SPEED 2 0m32.659s 903642376 3 0m36.749s 890805856 4 0m41.532s 876697184 5 0m48.383s 862778576 6 1m3.176s 855251640 Z_DEFAULT_COMPRESSION 7 1m15.335s 853755920 8 2m0.561s 852497560 9 2m33.972s 852397408 Z_BEST_COMPRESSION ``` It shows that it is probably not reasonable to use values greater than 6. Differential revision: https://reviews.llvm.org/D70658
2019-11-25 17:39:03 +08:00
# REQUIRES: x86, zlib
# RUN: yaml2obj %s -o %t.o
# RUN: ld.lld %t.o -o %t.default --compress-debug-sections=zlib
# RUN: llvm-readelf --sections %t.default | FileCheck -check-prefixes=HEADER,LEVEL1 %s
# RUN: ld.lld -O0 %t.o -o %t.O0 --compress-debug-sections=zlib
# RUN: llvm-readelf --sections %t.O0 | FileCheck -check-prefixes=HEADER,LEVEL1 %s
# RUN: cmp %t.default %t.O0
# RUN: ld.lld -O1 %t.o -o %t.O1 --compress-debug-sections=zlib
# RUN: llvm-readelf --sections %t.O1 | FileCheck -check-prefixes=HEADER,LEVEL1 %s
# RUN: cmp %t.default %t.O1
# RUN: ld.lld -O2 %t.o -o %t.O2 --compress-debug-sections=zlib
# RUN: llvm-readelf --sections %t.O2 | FileCheck -check-prefixes=HEADER,LEVEL6 %s
## LLD uses zlib compression of level 1 when -O0, -O1 and level 6 when -O2.
## Here we check how -O flag affects the size of compressed sections produced.
# HEADER: [Nr] Name Type Address Off Size
# LEVEL1: [ 1] .debug_info PROGBITS 00000000 000094 00001c
[ELF] Adjust test to work for zlib 1.2.8 The previous data had the same length with compression levels 1 and 6 for zlib 1.2.8. Adjust the test to work for this library version. I've also tested this with zlib 1.2.7 and zlib 1.2.11.
2019-11-27 09:17:21 +08:00
# LEVEL6: [ 1] .debug_info PROGBITS 00000000 000094 00001a
[LLD][ELF] - Make compression level be dependent on -On. Currently LLD always use zlib compression level 6. This patch changes it to use 1 for -O0, -O1 and 6 for -O2. It fixes https://bugs.llvm.org/show_bug.cgi?id=44089. There was also a thread in llvm-dev on this topic: https://lists.llvm.org/pipermail/llvm-dev/2018-August/125020.html Here is a table with results of building clang mentioned there: ``` Level Time Size 0 0m17.128s 2045081496 Z_NO_COMPRESSION 1 0m31.471s 922618584 Z_BEST_SPEED 2 0m32.659s 903642376 3 0m36.749s 890805856 4 0m41.532s 876697184 5 0m48.383s 862778576 6 1m3.176s 855251640 Z_DEFAULT_COMPRESSION 7 1m15.335s 853755920 8 2m0.561s 852497560 9 2m33.972s 852397408 Z_BEST_COMPRESSION ``` It shows that it is probably not reasonable to use values greater than 6. Differential revision: https://reviews.llvm.org/D70658
2019-11-25 17:39:03 +08:00
## A little arbitrary debug section which has a different size after
## applying compression of level 1 and 6.
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_386
Sections:
- Name: .debug_info
Type: SHT_PROGBITS
[ELF] Adjust test to work for zlib 1.2.8 The previous data had the same length with compression levels 1 and 6 for zlib 1.2.8. Adjust the test to work for this library version. I've also tested this with zlib 1.2.7 and zlib 1.2.11.
2019-11-27 09:17:21 +08:00
Content: '010101010101010201010201'