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eb9d6d122a
This patch imports constant variables even when they can't be internalized (which results in promotion). This offers some extra constant folding opportunities. Differential revision: https://reviews.llvm.org/D70404
35 lines
1.3 KiB
LLVM
35 lines
1.3 KiB
LLVM
; Check that we internalize external constant if it is accessed
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; purely by non-volatile loads.
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; RUN: opt -thinlto-bc %s -o %t-main
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; RUN: opt -thinlto-bc %p/Inputs/import-ro-constant-foo.ll -o %t-foo
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; RUN: opt -thinlto-bc %p/Inputs/import-ro-constant-bar.ll -o %t-bar
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; RUN: llvm-lto2 run -save-temps -o %t-out %t-main %t-foo %t-bar \
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; RUN: -r=%t-foo,foo,pl \
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; RUN: -r=%t-main,main,plx \
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; RUN: -r=%t-main,_Z3barv,l \
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; RUN: -r=%t-main,foo, \
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; RUN: -r=%t-bar,_Z3barv,pl \
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; RUN: -r=%t-bar,foo,
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; RUN: llvm-dis %t-out.1.3.import.bc -o - | FileCheck %s --check-prefix=IMPORT
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; RUN: llvm-dis %t-out.1.4.opt.bc -o - | FileCheck %s --check-prefix=OPT
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; IMPORT: @foo = internal local_unnamed_addr constant i32 21, align 4 #0
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; IMPORT: attributes #0 = { "thinlto-internalize" }
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; OPT: i32 @main()
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; OPT-NEXT: entry:
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; OPT-NEXT: ret i32 42
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source_filename = "main.c"
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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-unknown-linux-gnu"
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@foo = external dso_local local_unnamed_addr constant i32, align 4
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define dso_local i32 @main() local_unnamed_addr {
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entry:
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%0 = load i32, i32* @foo, align 4
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%call = tail call i32 @_Z3barv()
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%add = add nsw i32 %call, %0
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ret i32 %add
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}
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declare dso_local i32 @_Z3barv() local_unnamed_addr
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