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DeadStoreElimination can now trim the size of a store if the end of it is dead.

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Only currently done if the later store is writing to a power of 2 address or 
has the same alignment as the earlier store as then its likely to not break up
large stores into smaller ones

Fixes <rdar://problem/10140300>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143630 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper
2011-11-03 18:01:56 +00:00
parent fb6d79a58e
commit 2d32b86543
2 changed files with 186 additions and 32 deletions
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78
test/Transforms/DeadStoreElimination/OverwriteStoreEnd.ll Normal file
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; RUN: opt < %s -basicaa -dse -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-S128"
%struct.vec2 = type { <4 x i32>, <4 x i32> }
%struct.vec2plusi = type { <4 x i32>, <4 x i32>, i32 }
@glob1 = global %struct.vec2 zeroinitializer, align 16
@glob2 = global %struct.vec2plusi zeroinitializer, align 16
define void @write24to28(i32* nocapture %p) nounwind uwtable ssp {
; CHECK: @write24to28
entry:
%arrayidx0 = getelementptr inbounds i32* %p, i64 1
%p3 = bitcast i32* %arrayidx0 to i8*
; CHECK: call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 24, i32 4, i1 false)
call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false)
%arrayidx1 = getelementptr inbounds i32* %p, i64 7
store i32 1, i32* %arrayidx1, align 4
ret void
}
define void @write28to32(i32* nocapture %p) nounwind uwtable ssp {
; CHECK: @write28to32
entry:
%p3 = bitcast i32* %p to i8*
; CHECK: call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false)
call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 32, i32 4, i1 false)
%arrayidx1 = getelementptr inbounds i32* %p, i64 7
store i32 1, i32* %arrayidx1, align 4
ret void
}
define void @dontwrite28to32memset(i32* nocapture %p) nounwind uwtable ssp {
; CHECK: @dontwrite28to32memset
entry:
%p3 = bitcast i32* %p to i8*
; CHECK: call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 32, i32 16, i1 false)
call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 32, i32 16, i1 false)
%arrayidx1 = getelementptr inbounds i32* %p, i64 7
store i32 1, i32* %arrayidx1, align 4
ret void
}
define void @write32to36(%struct.vec2plusi* nocapture %p) nounwind uwtable ssp {
; CHECK: @write32to36
entry:
%0 = bitcast %struct.vec2plusi* %p to i8*
; CHECK: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.vec2plusi* @glob2 to i8*), i64 32, i32 16, i1 false)
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.vec2plusi* @glob2 to i8*), i64 36, i32 16, i1 false)
%c = getelementptr inbounds %struct.vec2plusi* %p, i64 0, i32 2
store i32 1, i32* %c, align 4
ret void
}
define void @write16to32(%struct.vec2* nocapture %p) nounwind uwtable ssp {
; CHECK: @write16to32
entry:
%0 = bitcast %struct.vec2* %p to i8*
; CHECK: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.vec2* @glob1 to i8*), i64 16, i32 16, i1 false)
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.vec2* @glob1 to i8*), i64 32, i32 16, i1 false)
%c = getelementptr inbounds %struct.vec2* %p, i64 0, i32 1
store <4 x i32> <i32 1, i32 2, i32 3, i32 4>, <4 x i32>* %c, align 4
ret void
}
define void @dontwrite28to32memcpy(%struct.vec2* nocapture %p) nounwind uwtable ssp {
; CHECK: @dontwrite28to32memcpy
entry:
%0 = bitcast %struct.vec2* %p to i8*
; CHECK: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.vec2* @glob1 to i8*), i64 32, i32 16, i1 false)
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.vec2* @glob1 to i8*), i64 32, i32 16, i1 false)
%arrayidx1 = getelementptr inbounds %struct.vec2* %p, i64 0, i32 0, i64 7
store i32 1, i32* %arrayidx1, align 4
ret void
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind