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It looks like this isn't necessary (in any tests I've done, it results in the global being described with no location or value in the imported side - while it's still fully described in the place it's imported from) & results in significant/pathological debug info growth to home these location-less global variable descriptions on the import side. This is a rather pressing/important issue to address - this regressed executable size for one example I'm looking at by 15%, object size is probably similar though I haven't measured it, and a 22x increase in the number of CUs in the cu_index in split DWARF DWP files, creating a similarly large regression in the time it takes llvm-symbolizer to run on such binaries. Reviewers: tejohnson, evgeny777 Differential Revision: https://reviews.llvm.org/D55309 llvm-svn: 348416
50 lines
2.2 KiB
LLVM
50 lines
2.2 KiB
LLVM
; Check constant propagation in thinlto combined summary. This allows us to do 2 things:
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; 1. Internalize global definition which is not used externally if all accesses to it are read-only
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; 2. Make a local copy of internal definition if all accesses to it are readonly. This allows constant
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; folding it during optimziation phase.
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; -stats requires asserts
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; REQUIRES: asserts
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; RUN: opt -module-summary %s -o %t1.bc
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; RUN: opt -module-summary %p/Inputs/index-const-prop.ll -o %t2.bc
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; RUN: llvm-lto -thinlto-action=thinlink -o %t3.index.bc %t1.bc %t2.bc
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; RUN: llvm-lto -thinlto-action=import -exported-symbol=main %t1.bc -thinlto-index=%t3.index.bc -o %t1.imported.bc -stats 2>&1 | FileCheck %s --check-prefix=STATS
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; RUN: llvm-dis %t1.imported.bc -o - | FileCheck %s --check-prefix=IMPORT
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; RUN: llvm-lto -thinlto-action=optimize %t1.imported.bc -o - | llvm-dis - -o - | FileCheck %s --check-prefix=OPTIMIZE
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; STATS: 2 module-summary-index - Number of live global variables marked read only
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; Check that we don't internalize gBar when it is exported
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; RUN: llvm-lto -thinlto-action=import -exported-symbol main -exported-symbol gBar %t1.bc -thinlto-index=%t3.index.bc -o %t1.imported2.bc
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; RUN: llvm-dis %t1.imported2.bc -o - | FileCheck %s --check-prefix=IMPORT2
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; IMPORT: @gFoo.llvm.0 = internal unnamed_addr global i32 1, align 4, !dbg !0
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; IMPORT-NEXT: @gBar = internal local_unnamed_addr global i32 2, align 4, !dbg !5
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; IMPORT: !DICompileUnit({{.*}})
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; OPTIMIZE: define i32 @main
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; OPTIMIZE-NEXT: ret i32 3
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; IMPORT2: @gBar = available_externally local_unnamed_addr global i32 2, align 4, !dbg !5
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-linux-gnu"
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@gBar = external global i32
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; Should not be counted in the stats of live read only variables since it is
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; dead and will be dropped anyway.
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@gDead = internal unnamed_addr global i32 1, align 4
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define i32 @main() local_unnamed_addr {
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%call = tail call i32 bitcast (i32 (...)* @foo to i32 ()*)()
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%call1 = tail call i32 bitcast (i32 (...)* @bar to i32 ()*)()
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%add = add nsw i32 %call1, %call
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ret i32 %add
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}
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declare i32 @foo(...) local_unnamed_addr
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declare i32 @bar(...) local_unnamed_addr
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