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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
127 lines
4.2 KiB
ArmAsm
127 lines
4.2 KiB
ArmAsm
@ RUN: llvm-mc %s -triple=armv7-unknown-linux-gnueabi -filetype=obj -o - \
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@ RUN: | llvm-readobj -s -sd -sr -t | FileCheck %s
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@ Check the .group section for the function in comdat section.
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@ In C++, the instantiation of the template will come with linkonce (or
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@ linkonce_odr) linkage, so that the linker can remove the duplicated
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@ instantiation. When the exception handling is enabled on those function,
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@ we have to group the corresponding .ARM.extab and .ARM.exidx with the
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@ text section together.
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@
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@ This test case will check the content of .group section. The section index
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@ of the grouped sections should be recorded in .group section.
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.syntax unified
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.section .TEST1,"axG",%progbits,func1,comdat
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.weak func1
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.align 2
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.type func1,%function
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func1:
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.fnstart
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.save {r4, lr}
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push {r4, lr}
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.vsave {d8, d9, d10, d11, d12}
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vpush {d8, d9, d10, d11, d12}
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.pad #24
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sub sp, sp, #24
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add sp, sp, #24
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vpop {d8, d9, d10, d11, d12}
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pop {r4, pc}
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.globl __gxx_personality_v0
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.personality __gxx_personality_v0
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.handlerdata
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.fnend
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@-------------------------------------------------------------------------------
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@ Check the .group section
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@-------------------------------------------------------------------------------
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@ CHECK: Sections [
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@ CHECK: Section {
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@ CHECK: Index: 1
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@ CHECK: Name: .group
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@ CHECK: Type: SHT_GROUP (0x11)
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@ CHECK: Flags [ (0x0)
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@ CHECK: ]
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@ CHECK: SectionData (
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@-------------------------------------------------------------------------------
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@ The second, third, and fourth word should correspond to the section index
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@ of .TEST1, .ARM.extab.TEST1, and .ARM.exidx.TEST1.
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@-------------------------------------------------------------------------------
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@ CHECK: 0000: 01000000 05000000 06000000 07000000 |................|
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@ CHECK: )
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@ CHECK: }
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@-------------------------------------------------------------------------------
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@ Check the .TEST1 section
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@-------------------------------------------------------------------------------
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@ CHECK: Section {
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@ CHECK: Index: 5
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@ CHECK: Name: .TEST1
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@ CHECK: Type: SHT_PROGBITS (0x1)
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@-------------------------------------------------------------------------------
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@ The flags should contain SHF_GROUP.
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@-------------------------------------------------------------------------------
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@ CHECK: Flags [ (0x206)
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@ CHECK: SHF_ALLOC (0x2)
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@ CHECK: SHF_EXECINSTR (0x4)
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@ CHECK: SHF_GROUP (0x200)
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@ CHECK: ]
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@ CHECK: }
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@-------------------------------------------------------------------------------
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@ Check the .ARM.extab.TEST1 section
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@-------------------------------------------------------------------------------
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@ CHECK: Section {
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@ CHECK: Index: 6
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@ CHECK: Name: .ARM.extab.TEST1
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@ CHECK: Type: SHT_PROGBITS (0x1)
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@-------------------------------------------------------------------------------
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@ The flags should contain SHF_GROUP.
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@-------------------------------------------------------------------------------
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@ CHECK: Flags [ (0x202)
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@ CHECK: SHF_ALLOC (0x2)
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@ CHECK: SHF_GROUP (0x200)
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@ CHECK: ]
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@ CHECK: }
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@-------------------------------------------------------------------------------
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@ Check the .ARM.exidx.TEST1 section
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@-------------------------------------------------------------------------------
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@ CHECK: Section {
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@ CHECK: Index: 7
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@ CHECK: Name: .ARM.exidx.TEST1
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@ CHECK: Type: SHT_ARM_EXIDX (0x70000001)
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@-------------------------------------------------------------------------------
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@ The flags should contain SHF_GROUP.
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@-------------------------------------------------------------------------------
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@ CHECK: Flags [ (0x282)
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@ CHECK: SHF_ALLOC (0x2)
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@ CHECK: SHF_GROUP (0x200)
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@ CHECK: SHF_LINK_ORDER (0x80)
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@ CHECK: ]
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@ CHECK: Link: 5
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@ CHECK: }
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@ CHECK: ]
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@-------------------------------------------------------------------------------
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@ Check symbol func1. It should be weak binding, and belong to .TEST1 section.
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@-------------------------------------------------------------------------------
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@ CHECK: Symbols [
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@ CHECK: Symbol {
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@ CHECK: Name: func1
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@ CHECK: Binding: Weak (0x2)
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@ CHECK: Type: Function (0x2)
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@ CHECK: Section: .TEST1 (0x5)
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@ CHECK: }
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@ CHECK: ]
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