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Fix MachineLICM to actually visit inner loops.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108001 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-07-09 18:49:45 +00:00
parent e86b01c153
commit aa7426070d
2 changed files with 100 additions and 3 deletions
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14
lib/CodeGen/MachineLICM.cpp
View File

@ -199,9 +199,14 @@ FunctionPass *llvm::createMachineLICMPass(bool PreRegAlloc) {
/// LoopIsOuterMostWithPredecessor - Test if the given loop is the outer-most
/// loop that has a unique predecessor.
static bool LoopIsOuterMostWithPredecessor(MachineLoop *CurLoop) {
// Check whether this loop even has a unique predecessor.
if (!CurLoop->getLoopPredecessor())
return false;
// Ok, now check to see if any of its outer loops do.
for (MachineLoop *L = CurLoop->getParentLoop(); L; L = L->getParentLoop())
if (L->getLoopPredecessor())
return false;
// None of them did, so this is the outermost with a unique predecessor.
return true;
}
@ -224,14 +229,17 @@ bool MachineLICM::runOnMachineFunction(MachineFunction &MF) {
DT = &getAnalysis<MachineDominatorTree>();
AA = &getAnalysis<AliasAnalysis>();
for (MachineLoopInfo::iterator I = MLI->begin(), E = MLI->end(); I != E; ++I){
CurLoop = *I;
SmallVector<MachineLoop *, 8> Worklist(MLI->begin(), MLI->end());
while (!Worklist.empty()) {
CurLoop = Worklist.pop_back_val();
CurPreheader = 0;
// If this is done before regalloc, only visit outer-most preheader-sporting
// loops.
if (PreRegAlloc && !LoopIsOuterMostWithPredecessor(CurLoop))
if (PreRegAlloc && !LoopIsOuterMostWithPredecessor(CurLoop)) {
Worklist.append(CurLoop->begin(), CurLoop->end());
continue;
}
if (!PreRegAlloc)
HoistRegionPostRA();

89
test/CodeGen/X86/licm-nested.ll Normal file
View File

@ -0,0 +1,89 @@
; RUN: llc -march=x86-64 < %s -stats -info-output-file - | grep machine-licm | grep 2
; MachineLICM should be able to hoist the symbolic addresses out of
; the inner loops.
@main.flags = internal global [8193 x i8] zeroinitializer, align 16 ; <[8193 x i8]*> [#uses=3]
@.str = private constant [11 x i8] c"Count: %d\0A\00" ; <[11 x i8]*> [#uses=1]
define i32 @main(i32 %argc, i8** nocapture %argv) nounwind ssp {
entry:
%cmp = icmp eq i32 %argc, 2 ; <i1> [#uses=1]
br i1 %cmp, label %while.cond.preheader, label %bb.nph53
while.cond.preheader: ; preds = %entry
%arrayidx = getelementptr inbounds i8** %argv, i64 1 ; <i8**> [#uses=1]
%tmp2 = load i8** %arrayidx ; <i8*> [#uses=1]
%call = tail call i32 @atoi(i8* %tmp2) nounwind ; <i32> [#uses=2]
%tobool51 = icmp eq i32 %call, 0 ; <i1> [#uses=1]
br i1 %tobool51, label %while.end, label %bb.nph53
while.cond.loopexit: ; preds = %for.inc35
%indvar.next77 = add i32 %indvar76, 1 ; <i32> [#uses=2]
%exitcond78 = icmp eq i32 %indvar.next77, %NUM.0.ph80 ; <i1> [#uses=1]
br i1 %exitcond78, label %while.end, label %bb.nph
bb.nph53: ; preds = %entry, %while.cond.preheader
%NUM.0.ph80 = phi i32 [ %call, %while.cond.preheader ], [ 17000, %entry ] ; <i32> [#uses=1]
br label %bb.nph
bb.nph: ; preds = %while.cond.loopexit, %bb.nph53
%indvar76 = phi i32 [ 0, %bb.nph53 ], [ %indvar.next77, %while.cond.loopexit ] ; <i32> [#uses=1]
br label %for.body
for.body: ; preds = %for.body, %bb.nph
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ] ; <i64> [#uses=2]
%tmp = add i64 %indvar, 2 ; <i64> [#uses=1]
%arrayidx10 = getelementptr [8193 x i8]* @main.flags, i64 0, i64 %tmp ; <i8*> [#uses=1]
store i8 1, i8* %arrayidx10
%indvar.next = add i64 %indvar, 1 ; <i64> [#uses=2]
%exitcond = icmp eq i64 %indvar.next, 8191 ; <i1> [#uses=1]
br i1 %exitcond, label %for.body15, label %for.body
for.body15: ; preds = %for.body, %for.inc35
%indvar57 = phi i64 [ %indvar.next58, %for.inc35 ], [ 0, %for.body ] ; <i64> [#uses=4]
%count.248 = phi i32 [ %count.1, %for.inc35 ], [ 0, %for.body ] ; <i32> [#uses=2]
%tmp68 = add i64 %indvar57, 2 ; <i64> [#uses=2]
%tmp70 = mul i64 %indvar57, 3 ; <i64> [#uses=1]
%tmp71 = add i64 %tmp70, 6 ; <i64> [#uses=1]
%tmp73 = shl i64 %indvar57, 1 ; <i64> [#uses=1]
%add = add i64 %tmp73, 4 ; <i64> [#uses=2]
%arrayidx17 = getelementptr [8193 x i8]* @main.flags, i64 0, i64 %tmp68 ; <i8*> [#uses=1]
%tmp18 = load i8* %arrayidx17 ; <i8> [#uses=1]
%tobool19 = icmp eq i8 %tmp18, 0 ; <i1> [#uses=1]
br i1 %tobool19, label %for.inc35, label %if.then
if.then: ; preds = %for.body15
%cmp2443 = icmp slt i64 %add, 8193 ; <i1> [#uses=1]
br i1 %cmp2443, label %for.body25, label %for.end32
for.body25: ; preds = %if.then, %for.body25
%indvar55 = phi i64 [ %indvar.next56, %for.body25 ], [ 0, %if.then ] ; <i64> [#uses=2]
%tmp60 = mul i64 %tmp68, %indvar55 ; <i64> [#uses=2]
%tmp75 = add i64 %add, %tmp60 ; <i64> [#uses=1]
%arrayidx27 = getelementptr [8193 x i8]* @main.flags, i64 0, i64 %tmp75 ; <i8*> [#uses=1]
store i8 0, i8* %arrayidx27
%add31 = add i64 %tmp71, %tmp60 ; <i64> [#uses=1]
%cmp24 = icmp slt i64 %add31, 8193 ; <i1> [#uses=1]
%indvar.next56 = add i64 %indvar55, 1 ; <i64> [#uses=1]
br i1 %cmp24, label %for.body25, label %for.end32
for.end32: ; preds = %for.body25, %if.then
%inc34 = add nsw i32 %count.248, 1 ; <i32> [#uses=1]
br label %for.inc35
for.inc35: ; preds = %for.body15, %for.end32
%count.1 = phi i32 [ %inc34, %for.end32 ], [ %count.248, %for.body15 ] ; <i32> [#uses=2]
%indvar.next58 = add i64 %indvar57, 1 ; <i64> [#uses=2]
%exitcond67 = icmp eq i64 %indvar.next58, 8191 ; <i1> [#uses=1]
br i1 %exitcond67, label %while.cond.loopexit, label %for.body15
while.end: ; preds = %while.cond.loopexit, %while.cond.preheader
%count.0.lcssa = phi i32 [ 0, %while.cond.preheader ], [ %count.1, %while.cond.loopexit ] ; <i32> [#uses=1]
%call40 = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([11 x i8]* @.str, i64 0, i64 0), i32 %count.0.lcssa) nounwind ; <i32> [#uses=0]
ret i32 0
}
declare i32 @atoi(i8* nocapture) nounwind readonly
declare i32 @printf(i8* nocapture, ...) nounwind