llvm-6502/test/Analysis/ScalarEvolution/2008-07-12-UnneededSelect2.ll
Nick Lewycky 59cff12f88 Stop creating extraneous smax/umax in SCEV. This removes a regression where we
started complicating many loops ('for' loops, in fact).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53508 91177308-0d34-0410-b5e6-96231b3b80d8
2008-07-12 07:41:32 +00:00

31 lines
861 B
LLVM

; RUN: llvm-as < %s | opt -analyze -scalar-evolution |& not grep smax
; PR2070
define i32 @a(i32 %x) nounwind {
entry:
icmp sgt i32 %x, 1 ; <i1>:0 [#uses=1]
br i1 %0, label %bb.nph, label %bb2
bb.nph: ; preds = %entry
br label %bb
bb: ; preds = %bb1, %bb.nph
%z.02 = phi i32 [ %1, %bb1 ], [ 1, %bb.nph ] ; <i32> [#uses=1]
%i.01 = phi i32 [ %2, %bb1 ], [ 1, %bb.nph ] ; <i32> [#uses=2]
mul i32 %z.02, %i.01 ; <i32>:1 [#uses=2]
add i32 %i.01, 1 ; <i32>:2 [#uses=2]
br label %bb1
bb1: ; preds = %bb
icmp slt i32 %2, %x ; <i1>:3 [#uses=1]
br i1 %3, label %bb, label %bb1.bb2_crit_edge
bb1.bb2_crit_edge: ; preds = %bb1
%.lcssa = phi i32 [ %1, %bb1 ] ; <i32> [#uses=1]
br label %bb2
bb2: ; preds = %bb1.bb2_crit_edge, %entry
%z.0.lcssa = phi i32 [ %.lcssa, %bb1.bb2_crit_edge ], [ 1, %entry ] ; <i32> [#uses=1]
ret i32 %z.0.lcssa
}