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Turn a memcpy from a double* into a load/store of double instead of

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a load/store of i64.  The later prevents promotion/scalarrepl of the
source and dest in many cases.

This fixes the 300% performance regression of the byval stuff on 
stepanov_v1p2.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45945 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2008-01-14 00:28:35 +00:00
parent f497b028b8
commit 37ac608623
2 changed files with 60 additions and 9 deletions
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14
test/Transforms/InstCombine/memcpy-to-load.ll Normal file
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@@ -0,0 +1,14 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {load double}
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"
target triple = "i686-apple-darwin8"
define void @foo(double* %X, double* %Y) {
entry:
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
%tmp2 = bitcast double* %X to i8* ; <i8*> [#uses=1]
%tmp13 = bitcast double* %Y to i8* ; <i8*> [#uses=1]
call void @llvm.memcpy.i32( i8* %tmp2, i8* %tmp13, i32 8, i32 1 )
ret void
}
declare void @llvm.memcpy.i32(i8*, i8*, i32, i32) nounwind