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a5dac4e339
Summary: Add an option to allow the attribute propagation on the index to be disabled, to allow a workaround for issues (such as that fixed by D70977). Also move the setting of the WithAttributePropagation flag on the index into propagateAttributes(), and remove some old stale code that predated this flag and cleared the maybe read/write only bits when we need to disable the propagation (previously only when importing disabled, now also when the new option disables it). Reviewers: evgeny777, steven_wu Subscribers: mehdi_amini, inglorion, hiraditya, dexonsmith, arphaman, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D70984
49 lines
2.2 KiB
LLVM
49 lines
2.2 KiB
LLVM
; Checks that we optimize writeonly variables and corresponding stores using llvm-lto
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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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; Check that we optimize write-only variables
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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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; IMPORT: @gFoo.llvm.0 = internal unnamed_addr global i32 0, align 4, !dbg !0
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; IMPORT-NEXT: @gBar = internal local_unnamed_addr global i32 0, align 4, !dbg !5
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; IMPORT: !DICompileUnit({{.*}})
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; STATS: 2 module-summary-index - Number of live global variables marked write only
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; Check that we've optimized out variables and corresponding stores
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; OPTIMIZE-NOT: gFoo
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; OPTIMIZE-NOT: gBar
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; OPTIMIZE: i32 @main
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; OPTIMIZE-NEXT: %1 = tail call i32 @rand()
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; OPTIMIZE-NEXT: %2 = tail call i32 @rand()
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; OPTIMIZE-NEXT: ret i32 0
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; Confirm that with -propagate-attrs=false we no longer do write-only importing
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; RUN: llvm-lto -propagate-attrs=false -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-NOPROP
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; RUN: llvm-dis %t1.imported.bc -o - | FileCheck %s --check-prefix=IMPORT-NOPROP
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; STATS-NOPROP-NOT: Number of live global variables marked write only
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; IMPORT-NOPROP: @gFoo.llvm.0 = available_externally
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; IMPORT-NOPROP-NEXT: @gBar = available_externally
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-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 write 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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tail call void @baz()
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ret i32 0
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}
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declare void @baz() local_unnamed_addr
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