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llvm-mirror/test/Transforms/ScalarRepl/only-memcpy-uses.ll
Cameron Zwarich 7fd94ea393 Only convert allocas to scalars if it is profitable. The profitability metric I
chose is having a non-memcpy/memset use and being larger than any native integer
type. Originally I chose having an access of a size smaller than the total size
of the alloca, but this caused some minor issues on the spirit benchmark where
SRoA runs again after some inlining.

This fixes <rdar://problem/8613163>.

llvm-svn: 127718
2011-03-16 00:13:44 +00:00

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LLVM

; RUN: opt < %s -scalarrepl -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"
target triple = "x86_64-apple-darwin10.0.0"
%struct.S = type { [12 x i32] }
; CHECK: @bar4
define void @bar4(%struct.S* byval %s) nounwind ssp {
entry:
; CHECK: alloca
; CHECK-NOT: load
; CHECK: memcpy
%t = alloca %struct.S, align 4
%agg.tmp = alloca %struct.S, align 4
%tmp = bitcast %struct.S* %t to i8*
%tmp1 = bitcast %struct.S* %s to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %tmp, i8* %tmp1, i64 48, i32 4, i1 false)
%tmp2 = bitcast %struct.S* %agg.tmp to i8*
%tmp3 = bitcast %struct.S* %t to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %tmp2, i8* %tmp3, i64 48, i32 4, i1 false)
%call = call i32 (...)* @bazz(%struct.S* byval %agg.tmp)
ret void
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
declare i32 @bazz(...)