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instcombine: Migrate memmove optimizations

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This patch migrates the memmove optimizations from the simplify-libcalls
pass into the instcombine library call simplifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167687 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge
2012-11-11 06:22:40 +00:00
parent 11b04b40f2
commit d7cb600514
5 changed files with 56 additions and 36 deletions
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17
test/Transforms/InstCombine/memmove-1.ll Normal file
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@@ -0,0 +1,17 @@
; Test that the memmove library call simplifier works correctly.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
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"
declare i8* @memmove(i8*, i8*, i32)
; Check memmove(mem1, mem2, size) -> llvm.memmove(mem1, mem2, size, 1).
define i8* @test_simplify1(i8* %mem1, i8* %mem2, i32 %size) {
; CHECK: @test_simplify1
%ret = call i8* @memmove(i8* %mem1, i8* %mem2, i32 %size)
; CHECK: call void @llvm.memmove
ret i8* %ret
; CHECK: ret i8* %mem1
}