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utils: Fix segfault in flattencfg

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v2: continue iterating through the rest of the bb
    use for loop

v3: initialize FlattenCFG pass in ScalarOps
    add test

v4: split off initializing flattencfg to a separate patch
    add comment

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215574 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jan Vesely
2014-08-13 20:31:53 +00:00
parent f7a325b3a1
commit d3fa093dc9
2 changed files with 31 additions and 4 deletions
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26
test/Transforms/Util/flattencfg.ll Normal file
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@@ -0,0 +1,26 @@
; RUN: opt -flattencfg -S < %s | FileCheck %s
; This test checks whether the pass completes without a crash.
; The code is not transformed in any way
;
; CHECK-LABEL: @test_not_crash
define void @test_not_crash(i32 %in_a) #0 {
entry:
%cmp0 = icmp eq i32 %in_a, -1
%cmp1 = icmp ne i32 %in_a, 0
%cond0 = and i1 %cmp0, %cmp1
br i1 %cond0, label %b0, label %b1
b0: ; preds = %entry
%cmp2 = icmp eq i32 %in_a, 0
%cmp3 = icmp ne i32 %in_a, 1
%cond1 = or i1 %cmp2, %cmp3
br i1 %cond1, label %exit, label %b1
b1: ; preds = %entry, %b0
br label %exit
exit: ; preds = %entry, %b0, %b1
ret void
}