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https://github.com/c64scene-ar/llvm-6502.git
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b4b0b34181
Linkers normally read all the relocations upfront to compute the references between sections. Putting them together is a bit more cache friendly. I benchmarked linking a Release+Asserts clang with gold on a vm. I tried all 4 combinations of --gc-sections/no --gc-section hot and cold cache. I cleared the cache with echo 3 > /proc/sys/vm/drop_caches and warmed it up by running the link once before timing the subsequent ones. With cold cache and --gc-sections the time goes from 1.86130781665 +- 0.01713126697463843 seconds to 1.82370735105 +- 0.014127522318814516 seconds With cold cache and no --gc-sections the time goes from 1.6087245435500002 +- 0.012999066825178644 seconds to 1.5687122041500001 +- 0.013145850126026619 seconds With hot cache and no --gc-sections the time goes from 0.926200939 ( +- 0.33% ) seconds to 0.907200079 ( +- 0.31% ) seconds With hot cache and gc sections the time goes from 1.183038049 ( +- 0.34% ) seconds to 1.147355862 ( +- 0.39% ) seconds git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235165 91177308-0d34-0410-b5e6-96231b3b80d8
91 lines
2.2 KiB
ArmAsm
91 lines
2.2 KiB
ArmAsm
@ RUN: llvm-mc %s -triple=armv7-unknown-linux-gnueabi -filetype=obj -o - \
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@ RUN: | llvm-readobj -s | FileCheck %s
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@ Test that the ARM_EXIDX sections point (Link) to the corresponding text
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@ sections.
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@ FIXME: The section numbers are not important. If llvm-readobj printed the
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@ name first we could use a FileCheck variable.
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@ CHECK: Section {
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@ CHECK: Index: 6
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@ CHECK-NEXT: Name: .text
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@ CHECK-NEXT: Type: SHT_PROGBITS
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@ CHECK-NEXT: Flags [
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@ CHECK-NEXT: SHF_ALLOC
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@ CHECK-NEXT: SHF_EXECINSTR
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@ CHECK-NEXT: SHF_GROUP
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@ CHECK-NEXT: ]
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@ CHECK-NEXT: Address: 0x0
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@ CHECK-NEXT: Offset: 0x54
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@ CHECK-NEXT: Size: 4
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@ CHECK-NEXT: Link: 0
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@ CHECK-NEXT: Info: 0
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@ CHECK-NEXT: AddressAlignment: 1
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@ CHECK-NEXT: EntrySize: 0
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@ CHECK-NEXT: }
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@ CHECK-NEXT: Section {
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@ CHECK-NEXT: Index: 7
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@ CHECK-NEXT: Name: .ARM.exidx
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@ CHECK-NEXT: Type: SHT_ARM_EXIDX
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@ CHECK-NEXT: Flags [
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@ CHECK-NEXT: SHF_ALLOC
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@ CHECK-NEXT: SHF_GROUP
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@ CHECK-NEXT: SHF_LINK_ORDER
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@ CHECK-NEXT: ]
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@ CHECK-NEXT: Address: 0x0
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@ CHECK-NEXT: Offset: 0x58
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@ CHECK-NEXT: Size: 8
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@ CHECK-NEXT: Link: 6
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@ CHECK-NEXT: Info: 0
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@ CHECK-NEXT: AddressAlignment: 4
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@ CHECK-NEXT: EntrySize: 0
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@ CHECK-NEXT: }
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@ CHECK: Section {
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@ CHECK: Index: 8
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@ CHECK-NEXT: Name: .text
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@ CHECK-NEXT: Type: SHT_PROGBITS
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@ CHECK-NEXT: Flags [
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@ CHECK-NEXT: SHF_ALLOC
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@ CHECK-NEXT: SHF_EXECINSTR
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@ CHECK-NEXT: SHF_GROUP
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@ CHECK-NEXT: ]
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@ CHECK-NEXT: Address: 0x0
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@ CHECK-NEXT: Offset:
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@ CHECK-NEXT: Size: 4
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@ CHECK-NEXT: Link: 0
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@ CHECK-NEXT: Info: 0
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@ CHECK-NEXT: AddressAlignment: 1
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@ CHECK-NEXT: EntrySize: 0
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@ CHECK-NEXT: }
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@ CHECK-NEXT: Section {
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@ CHECK-NEXT: Index: 9
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@ CHECK-NEXT: Name: .ARM.exidx
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@ CHECK-NEXT: Type: SHT_ARM_EXIDX
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@ CHECK-NEXT: Flags [
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@ CHECK-NEXT: SHF_ALLOC
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@ CHECK-NEXT: SHF_GROUP
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@ CHECK-NEXT: SHF_LINK_ORDER
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@ CHECK-NEXT: ]
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@ CHECK-NEXT: Address: 0x0
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@ CHECK-NEXT: Offset:
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@ CHECK-NEXT: Size: 8
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@ CHECK-NEXT: Link: 8
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@ CHECK-NEXT: Info: 0
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@ CHECK-NEXT: AddressAlignment: 4
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@ CHECK-NEXT: EntrySize: 0
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@ CHECK-NEXT: }
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.section .text,"axG",%progbits,f,comdat
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f:
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.fnstart
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mov pc, lr
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.fnend
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.section .text,"axG",%progbits,g,comdat
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g:
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.fnstart
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mov pc, lr
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.fnend
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