mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-01 00:12:50 +01:00
db6c348f31
memcpy's like: memcpy(A, B) memcpy(A, C) we cannot delete the first memcpy as dead if A and C might be aliases. If so, we actually get: memcpy(A, B) memcpy(A, A) which is not correct to transform into: memcpy(A, A) This patch was heavily influenced by Jakub Staszak's patch in PR8728, thanks Jakub! llvm-svn: 120974
239 lines
6.3 KiB
LLVM
239 lines
6.3 KiB
LLVM
; RUN: opt < %s -basicaa -dse -S | FileCheck %s
|
|
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
|
|
|
|
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
|
|
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
|
|
declare void @llvm.memset.i64(i8*, i8, i64, i32)
|
|
declare void @llvm.memcpy.i64(i8*, i8*, i64, i32)
|
|
declare i8* @llvm.init.trampoline(i8*, i8*, i8*)
|
|
|
|
define void @test1(i32* %Q, i32* %P) {
|
|
%DEAD = load i32* %Q
|
|
store i32 %DEAD, i32* %P
|
|
store i32 0, i32* %P
|
|
ret void
|
|
; CHECK: @test1
|
|
; CHECK-NEXT: store i32 0, i32* %P
|
|
; CHECK-NEXT: ret void
|
|
}
|
|
|
|
; PR8576 - Should delete store of 10 even though p/q are may aliases.
|
|
define void @test2(i32 *%p, i32 *%q) {
|
|
store i32 10, i32* %p, align 4
|
|
store i32 20, i32* %q, align 4
|
|
store i32 30, i32* %p, align 4
|
|
ret void
|
|
; CHECK: @test2
|
|
; CHECK-NEXT: store i32 20
|
|
}
|
|
|
|
|
|
; PR8677
|
|
@g = global i32 1
|
|
|
|
define i32 @test3(i32* %g_addr) nounwind {
|
|
; CHECK: @test3
|
|
; CHECK: load i32* %g_addr
|
|
%g_value = load i32* %g_addr, align 4
|
|
store i32 -1, i32* @g, align 4
|
|
store i32 %g_value, i32* %g_addr, align 4
|
|
%tmp3 = load i32* @g, align 4
|
|
ret i32 %tmp3
|
|
}
|
|
|
|
|
|
define void @test4(i32* %Q) {
|
|
%a = load i32* %Q
|
|
volatile store i32 %a, i32* %Q
|
|
ret void
|
|
; CHECK: @test4
|
|
; CHECK-NEXT: load i32
|
|
; CHECK-NEXT: volatile store
|
|
; CHECK-NEXT: ret void
|
|
}
|
|
|
|
define void @test5(i32* %Q) {
|
|
%a = volatile load i32* %Q
|
|
store i32 %a, i32* %Q
|
|
ret void
|
|
; CHECK: @test5
|
|
; CHECK-NEXT: volatile load
|
|
; CHECK-NEXT: ret void
|
|
}
|
|
|
|
; Should delete store of 10 even though memset is a may-store to P (P and Q may
|
|
; alias).
|
|
define void @test6(i32 *%p, i8 *%q) {
|
|
store i32 10, i32* %p, align 4 ;; dead.
|
|
call void @llvm.memset.i64(i8* %q, i8 42, i64 900, i32 1)
|
|
store i32 30, i32* %p, align 4
|
|
ret void
|
|
; CHECK: @test6
|
|
; CHECK-NEXT: call void @llvm.memset
|
|
}
|
|
|
|
; Should delete store of 10 even though memcpy is a may-store to P (P and Q may
|
|
; alias).
|
|
define void @test7(i32 *%p, i8 *%q, i8* noalias %r) {
|
|
store i32 10, i32* %p, align 4 ;; dead.
|
|
call void @llvm.memcpy.i64(i8* %q, i8* %r, i64 900, i32 1)
|
|
store i32 30, i32* %p, align 4
|
|
ret void
|
|
; CHECK: @test7
|
|
; CHECK-NEXT: call void @llvm.memcpy
|
|
}
|
|
|
|
; Do not delete stores that are only partially killed.
|
|
define i32 @test8() {
|
|
%V = alloca i32
|
|
store i32 1234567, i32* %V
|
|
%V2 = bitcast i32* %V to i8*
|
|
store i8 0, i8* %V2
|
|
%X = load i32* %V
|
|
ret i32 %X
|
|
|
|
; CHECK: @test8
|
|
; CHECK: store i32 1234567
|
|
}
|
|
|
|
|
|
; Test for byval handling.
|
|
%struct.x = type { i32, i32, i32, i32 }
|
|
define void @test9(%struct.x* byval %a) nounwind {
|
|
%tmp2 = getelementptr %struct.x* %a, i32 0, i32 0
|
|
store i32 1, i32* %tmp2, align 4
|
|
ret void
|
|
; CHECK: @test9
|
|
; CHECK-NEXT: ret void
|
|
}
|
|
|
|
; va_arg has fuzzy dependence, the store shouldn't be zapped.
|
|
define double @test10(i8* %X) {
|
|
%X_addr = alloca i8*
|
|
store i8* %X, i8** %X_addr
|
|
%tmp.0 = va_arg i8** %X_addr, double
|
|
ret double %tmp.0
|
|
; CHECK: @test10
|
|
; CHECK: store
|
|
}
|
|
|
|
|
|
; DSE should delete the dead trampoline.
|
|
declare void @test11f()
|
|
define void @test11() {
|
|
; CHECK: @test11
|
|
%storage = alloca [10 x i8], align 16 ; <[10 x i8]*> [#uses=1]
|
|
; CHECK-NOT: alloca
|
|
%cast = getelementptr [10 x i8]* %storage, i32 0, i32 0 ; <i8*> [#uses=1]
|
|
%tramp = call i8* @llvm.init.trampoline( i8* %cast, i8* bitcast (void ()* @test11f to i8*), i8* null ) ; <i8*> [#uses=1]
|
|
; CHECK-NOT: trampoline
|
|
ret void
|
|
; CHECK: ret void
|
|
}
|
|
|
|
|
|
; PR2599 - load -> store to same address.
|
|
define void @test12({ i32, i32 }* %x) nounwind {
|
|
%tmp4 = getelementptr { i32, i32 }* %x, i32 0, i32 0
|
|
%tmp5 = load i32* %tmp4, align 4
|
|
%tmp7 = getelementptr { i32, i32 }* %x, i32 0, i32 1
|
|
%tmp8 = load i32* %tmp7, align 4
|
|
%tmp17 = sub i32 0, %tmp8
|
|
store i32 %tmp5, i32* %tmp4, align 4
|
|
store i32 %tmp17, i32* %tmp7, align 4
|
|
ret void
|
|
; CHECK: @test12
|
|
; CHECK-NOT: tmp5
|
|
; CHECK: ret void
|
|
}
|
|
|
|
|
|
; %P doesn't escape, the DEAD instructions should be removed.
|
|
declare void @test13f()
|
|
define i32* @test13() {
|
|
%p = tail call i8* @malloc(i32 4)
|
|
%P = bitcast i8* %p to i32*
|
|
%DEAD = load i32* %P
|
|
%DEAD2 = add i32 %DEAD, 1
|
|
store i32 %DEAD2, i32* %P
|
|
call void @test13f( )
|
|
store i32 0, i32* %P
|
|
ret i32* %P
|
|
; CHECK: @test13()
|
|
; CHECK-NEXT: malloc
|
|
; CHECK-NEXT: bitcast
|
|
; CHECK-NEXT: call void
|
|
}
|
|
|
|
declare noalias i8* @malloc(i32)
|
|
|
|
|
|
|
|
define void @test14(i32* %Q) {
|
|
%P = alloca i32
|
|
%DEAD = load i32* %Q
|
|
store i32 %DEAD, i32* %P
|
|
ret void
|
|
|
|
; CHECK: @test14
|
|
; CHECK-NEXT: ret void
|
|
}
|
|
|
|
|
|
; PR8701
|
|
|
|
;; Fully dead overwrite of memcpy.
|
|
define void @test15(i8* %P, i8* %Q) nounwind ssp {
|
|
tail call void @llvm.memcpy.i64(i8* %P, i8* %Q, i64 12, i32 1)
|
|
tail call void @llvm.memcpy.i64(i8* %P, i8* %Q, i64 12, i32 1)
|
|
ret void
|
|
; CHECK: @test15
|
|
; CHECK-NEXT: call void @llvm.memcpy
|
|
; CHECK-NEXT: ret
|
|
}
|
|
|
|
;; Full overwrite of smaller memcpy.
|
|
define void @test16(i8* %P, i8* %Q) nounwind ssp {
|
|
tail call void @llvm.memcpy.i64(i8* %P, i8* %Q, i64 8, i32 1)
|
|
tail call void @llvm.memcpy.i64(i8* %P, i8* %Q, i64 12, i32 1)
|
|
ret void
|
|
; CHECK: @test16
|
|
; CHECK-NEXT: call void @llvm.memcpy
|
|
; CHECK-NEXT: ret
|
|
}
|
|
|
|
;; Overwrite of memset by memcpy.
|
|
define void @test17(i8* %P, i8* noalias %Q) nounwind ssp {
|
|
tail call void @llvm.memset.i64(i8* %P, i8 42, i64 8, i32 1)
|
|
tail call void @llvm.memcpy.i64(i8* %P, i8* %Q, i64 12, i32 1)
|
|
ret void
|
|
; CHECK: @test17
|
|
; CHECK-NEXT: call void @llvm.memcpy
|
|
; CHECK-NEXT: ret
|
|
}
|
|
|
|
; Should not delete the volatile memset.
|
|
define void @test17v(i8* %P, i8* %Q) nounwind ssp {
|
|
tail call void @llvm.memset.p0i8.i64(i8* %P, i8 42, i64 8, i32 1, i1 true)
|
|
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i32 1, i1 false)
|
|
ret void
|
|
; CHECK: @test17v
|
|
; CHECK-NEXT: call void @llvm.memset
|
|
; CHECK-NEXT: call void @llvm.memcpy
|
|
; CHECK-NEXT: ret
|
|
}
|
|
|
|
; PR8728
|
|
; Do not delete instruction where possible situation is:
|
|
; A = B
|
|
; A = A
|
|
define void @test18(i8* %P, i8* %Q, i8* %R) nounwind ssp {
|
|
tail call void @llvm.memcpy.i64(i8* %P, i8* %Q, i64 12, i32 1)
|
|
tail call void @llvm.memcpy.i64(i8* %P, i8* %R, i64 12, i32 1)
|
|
ret void
|
|
; CHECK: @test18
|
|
; CHECK-NEXT: call void @llvm.memcpy
|
|
; CHECK-NEXT: call void @llvm.memcpy
|
|
; CHECK-NEXT: ret
|
|
}
|