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https://github.com/c64scene-ar/llvm-6502.git
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d1b6ca23b4
Instead of a custom implementation of replaceAllUsesWith, we just call
replaceAllUsesWith and recreate llvm.used and llvm.compiler-used.
This change is particularity interesting because it makes llvm see
through what clang is doing with static used functions in extern "C"
contexts. With this change, running clang -O2 in
extern "C" {
__attribute__((used)) static void foo() {}
}
produces
@llvm.used = appending global [1 x i8*] [i8* bitcast (void ()* @foo to
i8*)], section "llvm.metadata"
define internal void @foo() #0 {
entry:
ret void
}
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183756 91177308-0d34-0410-b5e6-96231b3b80d8
48 lines
1.5 KiB
LLVM
48 lines
1.5 KiB
LLVM
; RUN: opt < %s -globalopt -S | FileCheck %s
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@c = global i8 42
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@i = internal global i8 42
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; CHECK: @ia = internal global i8 42
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@ia = alias internal i8* @i
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@llvm.used = appending global [3 x i8*] [i8* bitcast (void ()* @fa to i8*), i8* bitcast (void ()* @f to i8*), i8* @ca], section "llvm.metadata"
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; CHECK-DAG: @llvm.used = appending global [3 x i8*] [i8* bitcast (void ()* @fa to i8*), i8* bitcast (void ()* @f to i8*), i8* @ca], section "llvm.metadata"
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@llvm.compiler_used = appending global [4 x i8*] [i8* bitcast (void ()* @fa3 to i8*), i8* bitcast (void ()* @fa to i8*), i8* @ia, i8* @i], section "llvm.metadata"
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; CHECK-DAG: @llvm.compiler_used = appending global [2 x i8*] [i8* bitcast (void ()* @fa3 to i8*), i8* @ia], section "llvm.metadata"
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@sameAsUsed = global [3 x i8*] [i8* bitcast (void ()* @fa to i8*), i8* bitcast (void ()* @f to i8*), i8* @ca]
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; CHECK-DAG: @sameAsUsed = global [3 x i8*] [i8* bitcast (void ()* @f to i8*), i8* bitcast (void ()* @f to i8*), i8* @c]
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@other = global i32* bitcast (void ()* @fa to i32*)
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; CHECK-DAG: @other = global i32* bitcast (void ()* @f to i32*)
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@fa = alias internal void ()* @f
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; CHECK: @fa = alias internal void ()* @f
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@fa2 = alias internal void ()* @f
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; CHECK-NOT: @fa2
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@fa3 = alias internal void ()* @f
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; CHECK: @fa3
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@ca = alias internal i8* @c
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; CHECK: @ca = alias internal i8* @c
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define void @f() {
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ret void
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}
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define i8* @g() {
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ret i8* bitcast (void ()* @fa to i8*);
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}
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define i8* @g2() {
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ret i8* bitcast (void ()* @fa2 to i8*);
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}
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define i8* @h() {
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ret i8* @ca
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}
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