only-lower-check.ll
1.33 KB
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; RUN: opt -irce-print-range-checks -irce-print-changed-loops -verify-loop-info -irce < %s 2>&1 | FileCheck %s
; RUN: opt -irce-print-range-checks -irce-print-changed-loops -verify-loop-info -passes='require<branch-prob>,loop(irce)' < %s 2>&1 | FileCheck %s
; CHECK: irce: loop has 1 inductive range checks:
; CHECK-NEXT: InductiveRangeCheck:
; CHECK-NEXT: Begin: (-1 + %n) Step: -1 End: 2147483647
; CHECK-NEXT: CheckUse: br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1 Operand: 0
; CHECK-NEXT: irce: in function only_lower_check: constrained Loop at depth 1 containing: %loop<header><exiting>,%in.bounds<latch><exiting>
define void @only_lower_check(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
entry:
%len = load i32, i32* %a_len_ptr, !range !0
%first.itr.check = icmp sgt i32 %n, 0
%start = sub i32 %n, 1
br i1 %first.itr.check, label %loop, label %exit
loop:
%idx = phi i32 [ %start, %entry ] , [ %idx.dec, %in.bounds ]
%idx.dec = sub i32 %idx, 1
%abc = icmp sge i32 %idx, 0
br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp sgt i32 %idx.dec, -1
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
!0 = !{i32 0, i32 2147483647}
!1 = !{!"branch_weights", i32 64, i32 4}