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llvm-project/llvm/test/Analysis/BlockFrequencyInfo/irreducible_loop_crash.ll

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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). llvm-svn: 247050
2015-09-09 03:22:17 +08:00
; 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
}