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Limit LTO inlining even when profile is present

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Reduce the import instr limit from the LLVM default (100) to 40. This
helps reduce the binary size as well as improving performance slightly.

Size:
             Default(100)   40        30
libhwui.so   11059040       11058912  11060872
libart.so    10697576       10697160  10696568

Performance:
40 vs. default:  0.37% improvement
                 http://go/art-benchmark?p=BootImageProfileId:36054
30 vs. default:  0.36% improvement
                 http://go/art-benchmark?p=BootImageProfileId:36058

Test: presubmit
Change-Id: Id800ff7818cde908daab784bac0a312c6a71272d
This commit is contained in:
Yi Kong 2023-08-01 14:12:39 +09:00
parent 1e079dfdf2
commit d6ab48c660
1 changed files with 8 additions and 4 deletions
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12
cc/lto.go
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@ -135,10 +135,14 @@ func (lto *lto) flags(ctx BaseModuleContext, flags Flags) Flags {
ltoLdFlags = append(ltoLdFlags, cachePolicyFormat+policy)
}
// If the module does not have a profile, be conservative and limit cross TU inline
// limit to 5 LLVM IR instructions, to balance binary size increase and performance.
if !ctx.Darwin() && !ctx.isPgoCompile() && !ctx.isAfdoCompile() {
ltoLdFlags = append(ltoLdFlags, "-Wl,-plugin-opt,-import-instr-limit=5")
// Reduce the inlining threshold for a better balance of binary size and
// performance.
if !ctx.Darwin() {
if ctx.isPgoCompile() || ctx.isAfdoCompile() {
ltoLdFlags = append(ltoLdFlags, "-Wl,-plugin-opt,-import-instr-limit=40")
} else {
ltoLdFlags = append(ltoLdFlags, "-Wl,-plugin-opt,-import-instr-limit=5")
}
}
flags.Local.CFlags = append(flags.Local.CFlags, ltoCFlags...)