6d44a1ef55
zstd excels at scaling from low-ratio-very-fast to high-ratio-pretty-slow. Some users prioritize speed and prefer disk read speed, while others focus on achieving the highest compression ratio possible, similar to traditional high-ratio codecs like LZMA. Add an optional `level` to `--compress-sections` (#84855) to cater to these diverse needs. While we initially aimed for a one-size-fits-all approach, this no longer seems to work. (https://richg42.blogspot.com/2015/11/the-lossless-decompression-pareto.html) When --compress-debug-sections is used together, make --compress-sections take precedence since --compress-sections is usually more specific. Remove the level distinction between -O/-O1 and -O2 for --compress-debug-sections=zlib for a more consistent user experience. Pull Request: https://github.com/llvm/llvm-project/pull/90567
37 lines
1.2 KiB
Plaintext
37 lines
1.2 KiB
Plaintext
# REQUIRES: x86, zlib
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# RUN: yaml2obj %s -o %t.o
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## LLD uses zlib compression of level 1 by default. Unlike previous versions,
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## -O does not change the level.
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# RUN: ld.lld %t.o -o %t.default --compress-debug-sections=zlib
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# RUN: llvm-readelf --sections %t.default | FileCheck -check-prefixes=HEADER,LEVEL1 %s
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# RUN: ld.lld -O0 %t.o -o %t.O0 --compress-debug-sections=zlib
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# RUN: cmp %t.default %t.O0
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# RUN: ld.lld -O2 %t.o -o %t.O2 --compress-debug-sections=zlib
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# RUN: cmp %t.default %t.O2
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## --compression-level specifies the level.
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# RUN: ld.lld %t.o -o %t.6 --compress-sections=.debug_info=zlib:6
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# RUN: llvm-readelf --sections %t.6 | FileCheck -check-prefixes=HEADER,LEVEL6 %s
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# HEADER: [Nr] Name Type Address Off Size
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# LEVEL1: [ 1] .debug_info PROGBITS 00000000 000094 00001{{[bc]}}
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# LEVEL6: [ 1] .debug_info PROGBITS 00000000 000094 00001a
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## A little arbitrary debug section which has a different size after
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## applying compression of level 1 and 6.
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--- !ELF
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FileHeader:
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Class: ELFCLASS32
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Data: ELFDATA2LSB
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Type: ET_REL
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Machine: EM_386
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Sections:
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- Name: .debug_info
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Type: SHT_PROGBITS
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Content: '010101010101010201010201'
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