1 ; RUN: opt < %s -analyze -iv-users | FileCheck %s 2 3 ; The value of %r is dependent on a polynomial iteration expression. 4 ; 5 ; CHECK-LABEL: IV Users for loop %foo.loop 6 ; CHECK: {1,+,3,+,2}<%foo.loop> 7 define i64 @foo(i64 %n) { 8 entry: 9 br label %foo.loop 10 11 foo.loop: 12 %indvar = phi i64 [ 0, %entry ], [ %indvar.next, %foo.loop ] 13 %indvar.next = add i64 %indvar, 1 14 %c = icmp eq i64 %indvar.next, %n 15 br i1 %c, label %exit, label %foo.loop 16 17 exit: 18 %r = mul i64 %indvar.next, %indvar.next 19 ret i64 %r 20 } 21 22 ; PR15470: LSR miscompile. The test2 function should return '1'. 23 ; 24 ; SCEV does not know how to denormalize chained recurrences, so make 25 ; sure they aren't marked as post-inc users. 26 ; 27 ; CHECK-LABEL: IV Users for loop %test2.loop 28 ; CHECK: %sext.us = {0,+,(16777216 + (-16777216 * %sub.us)),+,33554432}<%test2.loop> in %f = ashr i32 %sext.us, 24 29 define i32 @test2() { 30 entry: 31 br label %test2.loop 32 33 test2.loop: 34 %inc1115.us = phi i32 [ 0, %entry ], [ %inc11.us, %test2.loop ] 35 %inc11.us = add nsw i32 %inc1115.us, 1 36 %cmp.us = icmp slt i32 %inc11.us, 2 37 br i1 %cmp.us, label %test2.loop, label %for.end 38 39 for.end: 40 %tobool.us = icmp eq i32 %inc1115.us, 0 41 %sub.us = select i1 %tobool.us, i32 0, i32 0 42 %mul.us = shl i32 %inc1115.us, 24 43 %sub.cond.us = sub nsw i32 %inc1115.us, %sub.us 44 %sext.us = mul i32 %mul.us, %sub.cond.us 45 %f = ashr i32 %sext.us, 24 46 br label %exit 47 48 exit: 49 ret i32 %f 50 } 51
