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https://github.com/c64scene-ar/llvm-6502.git
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5a7aeaa019
refusing to optimize two memcpy's like this: copy A <- B copy C <- A if it couldn't prove that noalias(B,C). We can eliminate the copy by producing a memmove instead of memcpy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119694 91177308-0d34-0410-b5e6-96231b3b80d8
65 lines
2.5 KiB
LLVM
65 lines
2.5 KiB
LLVM
; RUN: opt < %s -basicaa -memcpyopt -dse -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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target triple = "i686-apple-darwin9"
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define void @test1({ x86_fp80, x86_fp80 }* sret %agg.result, x86_fp80 %z.0, x86_fp80 %z.1) nounwind {
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entry:
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%tmp2 = alloca { x86_fp80, x86_fp80 } ; <{ x86_fp80, x86_fp80 }*> [#uses=1]
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%memtmp = alloca { x86_fp80, x86_fp80 }, align 16 ; <{ x86_fp80, x86_fp80 }*> [#uses=2]
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%tmp5 = fsub x86_fp80 0xK80000000000000000000, %z.1 ; <x86_fp80> [#uses=1]
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call void @ccoshl( { x86_fp80, x86_fp80 }* sret %memtmp, x86_fp80 %tmp5, x86_fp80 %z.0 ) nounwind
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%tmp219 = bitcast { x86_fp80, x86_fp80 }* %tmp2 to i8* ; <i8*> [#uses=2]
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%memtmp20 = bitcast { x86_fp80, x86_fp80 }* %memtmp to i8* ; <i8*> [#uses=1]
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call void @llvm.memcpy.i32( i8* %tmp219, i8* %memtmp20, i32 32, i32 16 )
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%agg.result21 = bitcast { x86_fp80, x86_fp80 }* %agg.result to i8* ; <i8*> [#uses=1]
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call void @llvm.memcpy.i32( i8* %agg.result21, i8* %tmp219, i32 32, i32 16 )
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; Check that one of the memcpy's are removed.
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;; FIXME: PR 8643 We should be able to eliminate the last memcpy here.
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; CHECK: @test1
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; CHECK: call void @ccoshl
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; CHECK: call void @llvm.memcpy
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; CHECK-NOT: llvm.memcpy
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; CHECK: ret void
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ret void
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}
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declare void @ccoshl({ x86_fp80, x86_fp80 }* sret , x86_fp80, x86_fp80) nounwind
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declare void @llvm.memcpy.i32(i8*, i8*, i32, i32) nounwind
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; The intermediate alloca and one of the memcpy's should be eliminated, the
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; other should be related with a memmove.
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define void @test2(i8* %P, i8* %Q) nounwind {
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%memtmp = alloca { x86_fp80, x86_fp80 }, align 16
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%R = bitcast { x86_fp80, x86_fp80 }* %memtmp to i8*
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call void @llvm.memcpy.i32( i8* %R, i8* %P, i32 32, i32 16 )
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call void @llvm.memcpy.i32( i8* %Q, i8* %R, i32 32, i32 16 )
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ret void
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; CHECK: @test2
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; CHECK-NEXT: call void @llvm.memmove{{.*}}(i8* %Q, i8* %P
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; CHECK-NEXT: ret void
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}
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@x = external global { x86_fp80, x86_fp80 }
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define void @test3({ x86_fp80, x86_fp80 }* noalias sret %agg.result) nounwind {
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%x.0 = alloca { x86_fp80, x86_fp80 }
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%x.01 = bitcast { x86_fp80, x86_fp80 }* %x.0 to i8*
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call void @llvm.memcpy.i32( i8* %x.01, i8* bitcast ({ x86_fp80, x86_fp80 }* @x to i8*), i32 32, i32 16 )
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%agg.result2 = bitcast { x86_fp80, x86_fp80 }* %agg.result to i8*
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call void @llvm.memcpy.i32( i8* %agg.result2, i8* %x.01, i32 32, i32 16 )
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ret void
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; CHECK: @test3
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; CHECK-NEXT: %agg.result2 = bitcast
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; CHECK-NEXT: call void @llvm.memcpy
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; CHECK-NEXT: ret void
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}
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