blob: 6c4f0c085ecfed5ef657ce7bca4e61768976ea66 [file] [log] [blame]
; RUN: opt -S -O1 < %s -o %t1.ll
; RUN: opt -S < %t1.ll -o %t2.ll
; RUN: opt -S -passes=simplifycfg < %t1.ll -o %t3.ll
;; Show that there's no difference after running another simplify CFG
; RUN: diff %t2.ll %t3.ll
; Test from LoopSink pass, leaves some single-entry single-exit basic blocks.
; After LoopSink, we get a basic block .exit.loopexit which has one entry and
; one exit, the only instruction is a branch. Make sure it doesn't show up.
; Make sure they disappear at -O1.
@g = global i32 0, align 4
define i32 @t1(i32, i32) {
%3 = icmp eq i32 %1, 0
br i1 %3, label %.exit, label %.preheader
%invariant = load i32, ptr @g
br label %.b1
%iv = phi i32 [ %t7, %.b7 ], [ 0, %.preheader ]
%c1 = icmp sgt i32 %iv, %0
br i1 %c1, label %.b2, label %.b6
%c2 = icmp sgt i32 %iv, 1
br i1 %c2, label %.b3, label %.b4
%t3 = sub nsw i32 %invariant, %iv
br label %.b5
%t4 = add nsw i32 %invariant, %iv
br label %.b5
%p5 = phi i32 [ %t3, %.b3 ], [ %t4, %.b4 ]
%t5 = mul nsw i32 %p5, 5
br label %.b7
%t6 = add nsw i32 %iv, 100
br label %.b7
%p7 = phi i32 [ %t6, %.b6 ], [ %t5, %.b5 ]
%t7 = add nuw nsw i32 %iv, 1
%c7 = icmp eq i32 %t7, %p7
br i1 %c7, label %.b1, label %.exit
ret i32 10