mirror of
https://github.com/RPCSX/llvm.git
synced 2024-11-24 12:19:53 +00:00
Fix PR 24723 - Handle 0-mass backedges in irreducible loops
This corner case happens when we have an irreducible SCC that is deeply nested. As we work down the tree, the backedge masses start getting smaller and smaller until we reach one that is down to 0. Since we distribute the incoming mass using the backedge masses as weight, the distributor does not allow zero weights. So, we simply ignore them (which will just use the weights of the non-zero nodes). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247050 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Diego Novillo
parent
5bd1a50ca2
commit
965f2c2437
@ -743,7 +743,10 @@ void BlockFrequencyInfoImplBase::adjustLoopHeaderMass(LoopData &Loop) {
|
||||
auto &BackedgeMass = Loop.BackedgeMass[Loop.getHeaderIndex(HeaderNode)];
|
||||
DEBUG(dbgs() << " - Add back edge mass for node "
|
||||
<< getBlockName(HeaderNode) << ": " << BackedgeMass << "\n");
|
||||
Dist.addLocal(HeaderNode, BackedgeMass.getMass());
|
||||
if (BackedgeMass.getMass() > 0)
|
||||
Dist.addLocal(HeaderNode, BackedgeMass.getMass());
|
||||
else
|
||||
DEBUG(dbgs() << " Nothing added. Back edge mass is zero\n");
|
||||
}
|
||||
|
||||
DitheringDistributer D(Dist, LoopMass);
|
||||
|
||||
155
test/Analysis/BlockFrequencyInfo/irreducible_loop_crash.ll
Normal file
155
test/Analysis/BlockFrequencyInfo/irreducible_loop_crash.ll
Normal file
@ -0,0 +1,155 @@
|
||||
; RUN: opt < %s -analyze -block-freq
|
||||
|
||||
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
|
||||
target triple = "x86_64-unknown-linux-gnu"
|
||||
|
||||
define void @fn1(i32* %f) {
|
||||
entry:
|
||||
%tobool7 = icmp eq i32 undef, 0
|
||||
br i1 undef, label %if.end.12, label %for.body.5
|
||||
|
||||
for.inc:
|
||||
store i32 undef, i32* %f, align 4
|
||||
br label %for.body.5
|
||||
|
||||
for.body.5: ; preds = %for.cond.4.preheader
|
||||
br i1 %tobool7, label %for.inc.9, label %for.inc
|
||||
|
||||
for.inc.9: ; preds = %for.body.5
|
||||
br i1 %tobool7, label %for.inc.9.1, label %for.inc
|
||||
|
||||
if.end.12: ; preds = %if.end.12, %for.body
|
||||
br i1 undef, label %for.end.17, label %for.inc
|
||||
|
||||
for.end.17: ; preds = %entry
|
||||
ret void
|
||||
|
||||
for.inc.9.1: ; preds = %for.inc.9
|
||||
br i1 %tobool7, label %for.inc.9.2, label %for.inc
|
||||
|
||||
for.inc.9.2: ; preds = %for.inc.9.1
|
||||
br i1 %tobool7, label %for.inc.9.3, label %for.inc
|
||||
|
||||
for.inc.9.3: ; preds = %for.inc.9.2
|
||||
br i1 %tobool7, label %for.inc.9.4, label %for.inc
|
||||
|
||||
for.inc.9.4: ; preds = %for.inc.9.3
|
||||
br i1 %tobool7, label %for.inc.9.5, label %for.inc
|
||||
|
||||
for.inc.9.5: ; preds = %for.inc.9.4
|
||||
br i1 %tobool7, label %for.inc.9.6, label %for.inc
|
||||
|
||||
for.inc.9.6: ; preds = %for.inc.9.5
|
||||
br i1 %tobool7, label %for.inc.9.7, label %for.inc
|
||||
|
||||
for.inc.9.7: ; preds = %for.inc.9.6
|
||||
br i1 %tobool7, label %for.inc.9.8, label %for.inc
|
||||
|
||||
for.inc.9.8: ; preds = %for.inc.9.7
|
||||
br i1 %tobool7, label %for.inc.9.9, label %for.inc
|
||||
|
||||
for.inc.9.9: ; preds = %for.inc.9.8
|
||||
br i1 %tobool7, label %for.inc.9.10, label %for.inc
|
||||
|
||||
for.inc.9.10: ; preds = %for.inc.9.9
|
||||
br i1 %tobool7, label %for.inc.9.11, label %for.inc
|
||||
|
||||
for.inc.9.11: ; preds = %for.inc.9.10
|
||||
br i1 %tobool7, label %for.inc.9.12, label %for.inc
|
||||
|
||||
for.inc.9.12: ; preds = %for.inc.9.11
|
||||
br i1 %tobool7, label %for.inc.9.13, label %for.inc
|
||||
|
||||
for.inc.9.13: ; preds = %for.inc.9.12
|
||||
br i1 %tobool7, label %for.inc.9.14, label %for.inc
|
||||
|
||||
for.inc.9.14: ; preds = %for.inc.9.13
|
||||
br i1 %tobool7, label %for.inc.9.15, label %for.inc
|
||||
|
||||
for.inc.9.15: ; preds = %for.inc.9.14
|
||||
br i1 %tobool7, label %for.inc.9.16, label %for.inc
|
||||
|
||||
for.inc.9.16: ; preds = %for.inc.9.15
|
||||
br i1 %tobool7, label %for.inc.9.17, label %for.inc
|
||||
|
||||
for.inc.9.17: ; preds = %for.inc.9.16
|
||||
br i1 %tobool7, label %for.inc.9.18, label %for.inc
|
||||
|
||||
for.inc.9.18: ; preds = %for.inc.9.17
|
||||
br i1 %tobool7, label %for.inc.9.19, label %for.inc
|
||||
|
||||
for.inc.9.19: ; preds = %for.inc.9.18
|
||||
br i1 %tobool7, label %for.inc.9.20, label %for.inc
|
||||
|
||||
for.inc.9.20: ; preds = %for.inc.9.19
|
||||
br i1 %tobool7, label %for.inc.9.21, label %for.inc
|
||||
|
||||
for.inc.9.21: ; preds = %for.inc.9.20
|
||||
br i1 %tobool7, label %for.inc.9.22, label %for.inc
|
||||
|
||||
for.inc.9.22: ; preds = %for.inc.9.21
|
||||
br i1 %tobool7, label %for.inc.9.23, label %for.inc
|
||||
|
||||
for.inc.9.23: ; preds = %for.inc.9.22
|
||||
br i1 %tobool7, label %for.inc.9.24, label %for.inc
|
||||
|
||||
for.inc.9.24: ; preds = %for.inc.9.23
|
||||
br i1 %tobool7, label %for.inc.9.25, label %for.inc
|
||||
|
||||
for.inc.9.25: ; preds = %for.inc.9.24
|
||||
br i1 %tobool7, label %for.inc.9.26, label %for.inc
|
||||
|
||||
for.inc.9.26: ; preds = %for.inc.9.25
|
||||
br i1 %tobool7, label %for.inc.9.27, label %for.inc
|
||||
|
||||
for.inc.9.27: ; preds = %for.inc.9.26
|
||||
br i1 %tobool7, label %for.inc.9.28, label %for.inc
|
||||
|
||||
for.inc.9.28: ; preds = %for.inc.9.27
|
||||
br i1 %tobool7, label %for.inc.9.29, label %for.inc
|
||||
|
||||
for.inc.9.29: ; preds = %for.inc.9.28
|
||||
br i1 %tobool7, label %for.inc.9.30, label %for.inc
|
||||
|
||||
for.inc.9.30: ; preds = %for.inc.9.29
|
||||
br i1 %tobool7, label %for.inc.9.31, label %for.inc
|
||||
|
||||
for.inc.9.31: ; preds = %for.inc.9.30
|
||||
br i1 %tobool7, label %for.inc.9.32, label %for.inc
|
||||
|
||||
for.inc.9.32: ; preds = %for.inc.9.31
|
||||
br i1 %tobool7, label %for.inc.9.33, label %for.inc
|
||||
|
||||
for.inc.9.33: ; preds = %for.inc.9.32
|
||||
br i1 %tobool7, label %for.inc.9.34, label %for.inc
|
||||
|
||||
for.inc.9.34: ; preds = %for.inc.9.33
|
||||
br i1 %tobool7, label %for.inc.9.35, label %for.inc
|
||||
|
||||
for.inc.9.35: ; preds = %for.inc.9.34
|
||||
br i1 %tobool7, label %for.inc.9.36, label %for.inc
|
||||
|
||||
for.inc.9.36: ; preds = %for.inc.9.35
|
||||
br i1 %tobool7, label %for.inc.9.37, label %for.inc
|
||||
|
||||
for.inc.9.37: ; preds = %for.inc.9.36
|
||||
br i1 %tobool7, label %for.inc.9.38, label %for.inc
|
||||
|
||||
for.inc.9.38: ; preds = %for.inc.9.37
|
||||
br i1 %tobool7, label %for.inc.9.39, label %for.inc
|
||||
|
||||
for.inc.9.39: ; preds = %for.inc.9.38
|
||||
br i1 %tobool7, label %for.inc.9.40, label %for.inc
|
||||
|
||||
for.inc.9.40: ; preds = %for.inc.9.39
|
||||
br i1 %tobool7, label %for.inc.9.41, label %for.inc
|
||||
|
||||
for.inc.9.41: ; preds = %for.inc.9.40
|
||||
br i1 %tobool7, label %for.inc.9.42, label %for.inc
|
||||
|
||||
for.inc.9.42: ; preds = %for.inc.9.41
|
||||
br i1 %tobool7, label %for.inc.9.43, label %for.inc
|
||||
|
||||
for.inc.9.43: ; preds = %for.inc.9.42
|
||||
br i1 %tobool7, label %if.end.12, label %for.inc
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user