llvm-6502/test/Transforms/MemCpyOpt/memmove.ll
Dan Gohman c1be92f3bb Make BasicAliasAnalysis a normal AliasAnalysis implementation which
does normal initialization and normal chaining. Change the default
AliasAnalysis implementation to NoAlias.

Update StandardCompileOpts.h and friends to explicitly request
BasicAliasAnalysis.

Update tests to explicitly request -basicaa.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116720 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-18 18:04:47 +00:00

38 lines
1.3 KiB
LLVM

; RUN: opt < %s -basicaa -memcpyopt -S | FileCheck %s
; These memmoves should get optimized to memcpys.
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"
target triple = "x86_64-apple-darwin9.0"
declare void @llvm.memmove.i64(i8* nocapture, i8* nocapture, i64, i32) nounwind
define i8* @test1(i8* nocapture %src) nounwind {
entry:
; CHECK: @test1
; CHECK: call void @llvm.memcpy
%call3 = malloc [13 x i8] ; <[13 x i8]*> [#uses=1]
%call3.sub = getelementptr inbounds [13 x i8]* %call3, i64 0, i64 0 ; <i8*> [#uses=2]
tail call void @llvm.memmove.i64(i8* %call3.sub, i8* %src, i64 13, i32 1)
ret i8* %call3.sub
}
define void @test2(i8* %P) nounwind {
entry:
; CHECK: @test2
; CHECK: call void @llvm.memcpy
%add.ptr = getelementptr i8* %P, i64 16 ; <i8*> [#uses=1]
tail call void @llvm.memmove.i64(i8* %P, i8* %add.ptr, i64 16, i32 1)
ret void
}
; This cannot be optimize because the src/dst really do overlap.
define void @test3(i8* %P) nounwind {
entry:
; CHECK: @test3
; CHECK: call void @llvm.memmove
%add.ptr = getelementptr i8* %P, i64 16 ; <i8*> [#uses=1]
tail call void @llvm.memmove.i64(i8* %P, i8* %add.ptr, i64 17, i32 1)
ret void
}