RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-24 03:33:20 +01:00
Code Issues Projects Releases Wiki Activity

If all of the write objects are identified then we can vectorize the loop even if the read objects are unidentified.

Browse Source 
PR14719.

llvm-svn: 171124
This commit is contained in:
Nadav Rotem 2012-12-26 23:30:53 +00:00
parent 9e3cb122f1
commit 4cad811734
2 changed files with 58 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
lib/Transforms/Vectorize/LoopVectorize.cpp
View File

@ -1704,6 +1704,7 @@ bool LoopVectorizationLegality::canVectorizeMemory() {
// Check that the read-writes do not conflict with other read-write
// pointers.
bool AllWritesIdentified = true;
for (I = ReadWrites.begin(), IE = ReadWrites.end(); I != IE; ++I) {
GetUnderlyingObjects(*I, TempObjects, DL);
for (ValueVector::iterator it=TempObjects.begin(), e=TempObjects.end();
@ -1711,6 +1712,7 @@ bool LoopVectorizationLegality::canVectorizeMemory() {
if (!isIdentifiedObject(*it)) {
DEBUG(dbgs() << "LV: Found an unidentified write ptr:"<< **it <<"\n");
NeedRTCheck = true;
AllWritesIdentified = false;
}
if (!WriteObjects.insert(*it)) {
DEBUG(dbgs() << "LV: Found a possible write-write reorder:"
@ -1726,7 +1728,9 @@ bool LoopVectorizationLegality::canVectorizeMemory() {
GetUnderlyingObjects(*I, TempObjects, DL);
for (ValueVector::iterator it=TempObjects.begin(), e=TempObjects.end();
it != e; ++it) {
if (!isIdentifiedObject(*it)) {
// If all of the writes are identified then we don't care if the read
// pointer is identified or not.
if (!AllWritesIdentified && !isIdentifiedObject(*it)) {
DEBUG(dbgs() << "LV: Found an unidentified read ptr:"<< **it <<"\n");
NeedRTCheck = true;
}

53
test/Transforms/LoopVectorize/calloc.ll Normal file
View File

@ -0,0 +1,53 @@
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -dce -instcombine -licm -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"
target triple = "x86_64-apple-macosx10.9.0"
;CHECK: hexit
;CHECK: zext <4 x i8>
;CHECK: ret
define noalias i8* @hexit(i8* nocapture %bytes, i64 %length) nounwind uwtable ssp {
entry:
%shl = shl i64 %length, 1
%add28 = or i64 %shl, 1
%call = tail call i8* @calloc(i64 1, i64 %add28) nounwind
%cmp29 = icmp eq i64 %shl, 0
br i1 %cmp29, label %for.end, label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
%0 = shl i64 %length, 1
br label %for.body
for.body: ; preds = %for.body, %for.body.lr.ph
%i.030 = phi i64 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%shr = lshr i64 %i.030, 1
%arrayidx = getelementptr inbounds i8* %bytes, i64 %shr
%1 = load i8* %arrayidx, align 1, !tbaa !0
%conv = zext i8 %1 to i32
%and = shl i64 %i.030, 2
%neg = and i64 %and, 4
%and3 = xor i64 %neg, 4
%sh_prom = trunc i64 %and3 to i32
%shl4 = shl i32 15, %sh_prom
%and5 = and i32 %conv, %shl4
%shr11 = lshr i32 %and5, %sh_prom
%conv13 = and i32 %shr11, 254
%cmp15 = icmp ugt i32 %conv13, 9
%cond = select i1 %cmp15, i32 87, i32 48
%add17 = add nsw i32 %cond, %shr11
%conv18 = trunc i32 %add17 to i8
%arrayidx19 = getelementptr inbounds i8* %call, i64 %i.030
store i8 %conv18, i8* %arrayidx19, align 1, !tbaa !0
%inc = add i64 %i.030, 1
%exitcond = icmp eq i64 %inc, %0
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret i8* %call
}
declare noalias i8* @calloc(i64, i64) nounwind
!0 = metadata !{metadata !"omnipotent char", metadata !1}
!1 = metadata !{metadata !"Simple C/C++ TBAA"}