de2ae96710
On Darwin, marking a section as "regular,live_support" means that a
symbol in the section should only be kept live if it has a reference to
something that is live. Otherwise, the linker is free to dead-strip it.
Turn this functionality on for the __llvm_prf_data section.
This means that counters and data associated with dead functions will be
removed from dead-stripped binaries. This will result in smaller
profiles and binaries, and should speed up profile collection.
Tested with check-profile, llvm-lit test/tools/llvm-{cov,profdata}, and
check-llvm.
Differential Revision: https://reviews.llvm.org/D25456
llvm-svn: 283947
40 lines
2.1 KiB
LLVM
40 lines
2.1 KiB
LLVM
; RUN: opt < %s -instrprof -S | FileCheck %s
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; RUN: opt < %s -passes=instrprof -S | FileCheck %s
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target triple = "x86_64-apple-macosx10.10.0"
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@__profn_foo = hidden constant [3 x i8] c"foo"
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; CHECK: @__profn_foo = private constant [3 x i8] c"foo"
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@__profn_bar = hidden constant [4 x i8] c"bar\00"
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; CHECK: @__profn_bar = private constant [4 x i8] c"bar\00"
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@__profn_baz = hidden constant [3 x i8] c"baz"
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; CHECK: @__profn_baz = private constant [3 x i8] c"baz"
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; CHECK: @__profc_foo = hidden global [1 x i64] zeroinitializer, section "__DATA,__llvm_prf_cnts", align 8
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; CHECK: @__profd_foo = hidden {{.*}}, section "__DATA,__llvm_prf_data,regular,live_support", align 8
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define void @foo() {
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call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_foo, i32 0, i32 0), i64 0, i32 1, i32 0)
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ret void
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}
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; CHECK: @__profc_bar = hidden global [1 x i64] zeroinitializer, section "__DATA,__llvm_prf_cnts", align 8
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; CHECK: @__profd_bar = hidden {{.*}}, section "__DATA,__llvm_prf_data,regular,live_support", align 8
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define void @bar() {
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call void @llvm.instrprof.increment(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @__profn_bar, i32 0, i32 0), i64 0, i32 1, i32 0)
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ret void
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}
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; CHECK: @__profc_baz = hidden global [3 x i64] zeroinitializer, section "__DATA,__llvm_prf_cnts", align 8
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; CHECK: @__profd_baz = hidden {{.*}}, section "__DATA,__llvm_prf_data,regular,live_support", align 8
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define void @baz() {
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call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_baz, i32 0, i32 0), i64 0, i32 3, i32 0)
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call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_baz, i32 0, i32 0), i64 0, i32 3, i32 1)
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call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_baz, i32 0, i32 0), i64 0, i32 3, i32 2)
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ret void
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}
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declare void @llvm.instrprof.increment(i8*, i64, i32, i32)
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; CHECK: @__llvm_profile_runtime = external global i32
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; CHECK: @llvm.used = appending global {{.*}} @__profd_foo {{.*}} @__profd_bar {{.*}} @__profd_baz {{.*}} section "llvm.metadata"
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