RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2025-01-27 06:54:30 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

[LIR] Avoid turning non-temporal stores into memset

Browse Source 
This is to fix PR26645.

llvm-svn: 261149
This commit is contained in:
Haicheng Wu 2016-02-17 21:00:06 +00:00
parent 2b359126ec
commit a14973fc4d
2 changed files with 35 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/Transforms/Scalar/LoopIdiomRecognize.cpp
View File

@ -314,6 +314,10 @@ bool LoopIdiomRecognize::isLegalStore(StoreInst *SI, bool &ForMemset,
if (!SI->isSimple())
return false;
// Avoid merging nontemporal stores.
if (SI->getMetadata(LLVMContext::MD_nontemporal))
return false;
Value *StoredVal = SI->getValueOperand();
Value *StorePtr = SI->getPointerOperand();

31
test/Transforms/LoopIdiom/nontemporal_store.ll Normal file
View File

@ -0,0 +1,31 @@
; RUN: opt -loop-idiom < %s -S | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%struct.bigBlock_t = type { [256 x <4 x float>] }
; CHECK-LABEL: @test(
; CHECK-NOT: llvm.memset
define void @test(%struct.bigBlock_t* %p) {
entry:
%0 = getelementptr inbounds %struct.bigBlock_t, %struct.bigBlock_t* %p, i64 0, i32 0, i64 0, i64 0
br label %for.body
for.body: ; preds = %entry, %for.body
%index.02 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%dst.01 = phi float* [ %0, %entry ], [ %add.ptr2, %for.body ]
%cast.i5 = bitcast float* %dst.01 to <4 x float>*
store <4 x float> zeroinitializer, <4 x float>* %cast.i5, align 16, !nontemporal !0
%add.ptr1 = getelementptr inbounds float, float* %dst.01, i64 4
%cast.i = bitcast float* %add.ptr1 to <4 x float>*
store <4 x float> zeroinitializer, <4 x float>* %cast.i, align 16, !nontemporal !0
%add.ptr2 = getelementptr inbounds float, float* %dst.01, i64 8
%add = add nuw nsw i32 %index.02, 32
%cmp = icmp ult i32 %add, 4096
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
!0 = !{i32 1}