mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-02-02 09:33:59 +00:00
95fa2f9326
I've built some tests in WebRTC with and without this change. With this change number of __tsan_read/write calls is reduced by 20-40%, binary size decreases by 5-10% and execution time drops by ~5%. For example: $ ls -l old/modules_unittests new/modules_unittests -rwxr-x--- 1 dvyukov 41708976 Jan 20 18:35 old/modules_unittests -rwxr-x--- 1 dvyukov 38294008 Jan 20 18:29 new/modules_unittests $ objdump -d old/modules_unittests | egrep "callq.*__tsan_(read|write|unaligned)" | wc -l 239871 $ objdump -d new/modules_unittests | egrep "callq.*__tsan_(read|write|unaligned)" | wc -l 148365 http://reviews.llvm.org/D7069 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228917 91177308-0d34-0410-b5e6-96231b3b80d8
92 lines
2.3 KiB
LLVM
92 lines
2.3 KiB
LLVM
; RUN: opt < %s -tsan -S | FileCheck %s
|
|
|
|
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
|
|
|
|
declare void @escape(i32*)
|
|
|
|
@sink = global i32* null, align 4
|
|
|
|
define void @captured0() nounwind uwtable sanitize_thread {
|
|
entry:
|
|
%ptr = alloca i32, align 4
|
|
; escapes due to call
|
|
call void @escape(i32* %ptr)
|
|
store i32 42, i32* %ptr, align 4
|
|
ret void
|
|
}
|
|
; CHECK-LABEL: define void @captured0
|
|
; CHECK: __tsan_write
|
|
; CHECK: ret void
|
|
|
|
define void @captured1() nounwind uwtable sanitize_thread {
|
|
entry:
|
|
%ptr = alloca i32, align 4
|
|
; escapes due to store into global
|
|
store i32* %ptr, i32** @sink, align 8
|
|
store i32 42, i32* %ptr, align 4
|
|
ret void
|
|
}
|
|
; CHECK-LABEL: define void @captured1
|
|
; CHECK: __tsan_write
|
|
; CHECK: __tsan_write
|
|
; CHECK: ret void
|
|
|
|
define void @captured2() nounwind uwtable sanitize_thread {
|
|
entry:
|
|
%ptr = alloca i32, align 4
|
|
%tmp = alloca i32*, align 8
|
|
; transitive escape
|
|
store i32* %ptr, i32** %tmp, align 8
|
|
%0 = load i32** %tmp, align 8
|
|
store i32* %0, i32** @sink, align 8
|
|
store i32 42, i32* %ptr, align 4
|
|
ret void
|
|
}
|
|
; CHECK-LABEL: define void @captured2
|
|
; CHECK: __tsan_write
|
|
; CHECK: __tsan_write
|
|
; CHECK: ret void
|
|
|
|
define void @notcaptured0() nounwind uwtable sanitize_thread {
|
|
entry:
|
|
%ptr = alloca i32, align 4
|
|
store i32 42, i32* %ptr, align 4
|
|
; escapes due to call
|
|
call void @escape(i32* %ptr)
|
|
ret void
|
|
}
|
|
; CHECK-LABEL: define void @notcaptured0
|
|
; CHECK: __tsan_write
|
|
; CHECK: ret void
|
|
|
|
define void @notcaptured1() nounwind uwtable sanitize_thread {
|
|
entry:
|
|
%ptr = alloca i32, align 4
|
|
store i32 42, i32* %ptr, align 4
|
|
; escapes due to store into global
|
|
store i32* %ptr, i32** @sink, align 8
|
|
ret void
|
|
}
|
|
; CHECK-LABEL: define void @notcaptured1
|
|
; CHECK: __tsan_write
|
|
; CHECK: __tsan_write
|
|
; CHECK: ret void
|
|
|
|
define void @notcaptured2() nounwind uwtable sanitize_thread {
|
|
entry:
|
|
%ptr = alloca i32, align 4
|
|
%tmp = alloca i32*, align 8
|
|
store i32 42, i32* %ptr, align 4
|
|
; transitive escape
|
|
store i32* %ptr, i32** %tmp, align 8
|
|
%0 = load i32** %tmp, align 8
|
|
store i32* %0, i32** @sink, align 8
|
|
ret void
|
|
}
|
|
; CHECK-LABEL: define void @notcaptured2
|
|
; CHECK: __tsan_write
|
|
; CHECK: __tsan_write
|
|
; CHECK: ret void
|
|
|
|
|