llvm-6502/test/Analysis/ScalarEvolution/2007-09-06-MisinterpretBranch.ll
Nick Lewycky 06323bfe03 Don't assume it's safe to transform a loop just because it's dominated by any
comparison. Fixes bug 1598.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40866 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-06 18:33:46 +00:00

19 lines
592 B
LLVM

; RUN: llvm-as < %s | opt -indvars -adce -simplifycfg | llvm-dis | grep "icmp s"
; PR1598
define i32 @f(i32 %a, i32 %b, i32 %x, i32 %y) {
entry:
%tmp3 = icmp eq i32 %a, %b ; <i1> [#uses=1]
br i1 %tmp3, label %return, label %bb
bb: ; preds = %bb, %entry
%x_addr.0 = phi i32 [ %tmp6, %bb ], [ %x, %entry ] ; <i32> [#uses=1]
%tmp6 = add i32 %x_addr.0, 1 ; <i32> [#uses=3]
%tmp9 = icmp slt i32 %tmp6, %y ; <i1> [#uses=1]
br i1 %tmp9, label %bb, label %return
return: ; preds = %bb, %entry
%x_addr.1 = phi i32 [ %x, %entry ], [ %tmp6, %bb ] ; <i32> [#uses=1]
ret i32 %x_addr.1
}