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Merge memsets followed by neighboring memsets and other stores into

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larger memsets.  Among other things, this fixes rdar://8760394 and
allows us to handle "Example 2" from http://blog.regehr.org/archives/320,
compiling it into a single 4096-byte memset:

_mad_synth_mute:                        ## @mad_synth_mute
## BB#0:                                ## %entry
	pushq	%rax
	movl	$4096, %esi             ## imm = 0x1000
	callq	___bzero
	popq	%rax
	ret



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123089 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2011-01-08 21:19:19 +00:00
parent 9fa11e94b5
commit d90a192279
2 changed files with 46 additions and 3 deletions
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test/Transforms/MemCpyOpt/form-memset.ll
+28
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@@ -164,6 +164,7 @@ entry:
declare void @foo(%struct.MV*, %struct.MV*, i8*)
; Store followed by memset.
define void @test3(i32* nocapture %P) nounwind ssp {
entry:
%arrayidx = getelementptr inbounds i32* %P, i64 1
@@ -177,6 +178,7 @@ entry:
; CHECK: call void @llvm.memset.p0i8.i64(i8* %1, i8 0, i64 15, i32 4, i1 false)
}
; store followed by memset, different offset scenario
define void @test4(i32* nocapture %P) nounwind ssp {
entry:
store i32 0, i32* %P, align 4
@@ -191,4 +193,30 @@ entry:
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
; Memset followed by store.
define void @test5(i32* nocapture %P) nounwind ssp {
entry:
%add.ptr = getelementptr inbounds i32* %P, i64 2
%0 = bitcast i32* %add.ptr to i8*
tail call void @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 11, i32 1, i1 false)
%arrayidx = getelementptr inbounds i32* %P, i64 1
store i32 0, i32* %arrayidx, align 4
ret void
; CHECK: @test5
; CHECK-NOT: store
; CHECK: call void @llvm.memset.p0i8.i64(i8* %1, i8 0, i64 15, i32 4, i1 false)
}
;; Memset followed by memset.
define void @test6(i32* nocapture %P) nounwind ssp {
entry:
%0 = bitcast i32* %P to i8*
tail call void @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 12, i32 1, i1 false)
%add.ptr = getelementptr inbounds i32* %P, i64 3
%1 = bitcast i32* %add.ptr to i8*
tail call void @llvm.memset.p0i8.i64(i8* %1, i8 0, i64 12, i32 1, i1 false)
ret void
; CHECK: @test6
; CHECK: call void @llvm.memset.p0i8.i64(i8* %2, i8 0, i64 24, i32 1, i1 false)
}