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324950270d
Summary: This is a relatively simple scheme: we use the index emitted in the bitcode to avoid loading all the global metadata. Instead we load the index with their position in the bitcode so that we can load each of them individually. Materializing the global metadata block in this condition only triggers loading the named metadata, and the ones referenced from there (transitively). When materializing a function, metadata from the global block are loaded lazily as they are referenced. Two main current limitations are: 1) Global values other than functions are not materialized on demand, so we need to eagerly load METADATA_GLOBAL_DECL_ATTACHMENT records (and their transitive dependencies). 2) When we load a single metadata, we don't recurse on the operands, instead we use a placeholder or a temporary metadata. Unfortunately tepmorary nodes are very expensive. This is why we don't have it always enabled and only for importing. These two limitations can be lifted in a subsequent improvement if needed. With this change, the total link time of opt with ThinLTO and Debug Info enabled is going down from 282s to 224s (~20%). Reviewers: pcc, tejohnson, dexonsmith Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D28113 llvm-svn: 291027
55 lines
1.8 KiB
LLVM
55 lines
1.8 KiB
LLVM
; Do setup work for all below tests: generate bitcode and combined index
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; RUN: opt -module-summary %s -o %t.bc -bitcode-mdindex-threshold=0
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; RUN: opt -module-summary %p/Inputs/lazyload_metadata.ll -o %t2.bc -bitcode-mdindex-threshold=0
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; RUN: llvm-lto -thinlto-action=thinlink -o %t3.bc %t.bc %t2.bc
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; Check that importing @globalfunc1 does not trigger loading all the global
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; metadata for @globalfunc2 and @globalfunc3
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; RUN: llvm-lto -thinlto-action=import %t2.bc -thinlto-index=%t3.bc \
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; RUN: -o /dev/null -stats \
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; RUN: 2>&1 | FileCheck %s -check-prefix=LAZY
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; LAZY: 49 bitcode-reader - Number of Metadata records loaded
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; LAZY: 1 bitcode-reader - Number of MDStrings loaded
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; RUN: llvm-lto -thinlto-action=import %t2.bc -thinlto-index=%t3.bc \
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; RUN: -o /dev/null -disable-ondemand-mds-loading -stats \
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; RUN: 2>&1 | FileCheck %s -check-prefix=NOTLAZY
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; NOTLAZY: 58 bitcode-reader - Number of Metadata records loaded
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; NOTLAZY: 8 bitcode-reader - Number of MDStrings loaded
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.11.0"
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define void @globalfunc1(i32 %arg) {
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%tmp = add i32 %arg, 0, !metadata !2
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ret void
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}
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; We need two functions here that will both reference the same metadata.
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; This is to force the metadata to be emitted in the global metadata block and
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; not in the function specific metadata.
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; These function are not imported and so we don't want to load their metadata.
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define void @globalfunc2(i32 %arg) {
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%tmp = add i32 %arg, 0, !metadata !1
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ret void
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}
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define void @globalfunc3(i32 %arg) {
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%tmp = add i32 %arg, 0, !metadata !1
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ret void
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}
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!1 = !{!2, !3, !4, !5, !6, !7, !8, !9}
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!2 = !{!"Hello World"}
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!3 = !{!"3"}
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!4 = !{!"4"}
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!5 = !{!"5"}
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!6 = !{!"6"}
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!7 = !{!"7"}
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!8 = !{!"8"}
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!9 = !{!"9"}
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