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llvm-mirror/test/Transforms/JumpThreading/2011-04-02-SimplifyDeadBlock.ll
Eli Friedman 8b6d220330 PR9446: RecursivelyDeleteTriviallyDeadInstructions can delete the instruction
after the given instruction; make sure to handle that case correctly.
(It's difficult to trigger; the included testcase involves a dead 
block, but I don't think that's a requirement.) 

While I'm here, get rid of the unnecessary warning about
SimplifyInstructionsInBlock, since it should work correctly as far as I know.

llvm-svn: 128782
2011-04-02 22:45:17 +00:00

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1.0 KiB
LLVM

; RUN: opt < %s -jump-threading
; PR9446
; Just check that it doesn't crash
define void @int327() nounwind {
entry:
unreachable
for.cond: ; preds = %for.cond4
%tobool3 = icmp eq i8 undef, 0
br i1 %tobool3, label %for.cond23, label %for.cond4
for.cond4: ; preds = %for.cond
br label %for.cond
for.cond23: ; preds = %for.body28, %for.cond23, %for.cond
%conv321 = phi i32 [ %conv32, %for.body28 ], [ 0, %for.cond ], [ %conv321, %for.cond23 ]
%l_266.0 = phi i32 [ %phitmp, %for.body28 ], [ 0, %for.cond ], [ 0, %for.cond23 ]
%cmp26 = icmp eq i32 %l_266.0, 0
br i1 %cmp26, label %for.body28, label %for.cond23
for.body28: ; preds = %for.cond23
%and = and i32 %conv321, 1
%conv32 = zext i8 undef to i32
%add = add nsw i32 %l_266.0, 1
%phitmp = and i32 %add, 255
br label %for.cond23
if.end43: ; No predecessors!
ret void
}