56 lines
1.9 KiB
LLVM
56 lines
1.9 KiB
LLVM
|
; RUN: opt < %s -loop-predication -S | FileCheck %s
|
||
|
|
|
||
|
|
;; This is a simplified copy of @unswitch_exit_form test that should trigger loop-predication
|
||
|
|
;; activity and properly bail out when discovering that widenable check does not lead to deopt.
|
||
|
|
;;
|
||
|
|
;; Error checking is rather silly here - it should pass compilation successfully,
|
||
|
|
;; in bad case it will just timeout.
|
||
|
|
;;
|
||
|
|
define i32 @unswitch_exit_form_with_endless_loop(i32* %array, i32 %length, i32 %n, i1 %cond_0) {
|
||
|
|
; CHECK-LABEL: @unswitch_exit_form_with_endless_loop
|
||
|
|
entry:
|
||
|
|
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
|
||
|
|
%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
|
||
|
|
br i1 %exiplicit_guard_cond, label %loop.preheader, label %not_really_a_deopt, !prof !0
|
||
|
|
|
||
|
|
not_really_a_deopt:
|
||
|
|
br label %looping
|
||
|
|
|
||
|
|
looping:
|
||
|
|
;; synthetic corner case that demonstrates the need for more careful traversal
|
||
|
|
;; of unique successors when walking through the exit for profitability checks.
|
||
|
|
br label %looping
|
||
|
|
|
||
|
|
loop.preheader:
|
||
|
|
br label %loop
|
||
|
|
|
||
|
|
loop:
|
||
|
|
%loop.acc = phi i32 [ %loop.acc.next, %guarded ], [ 0, %loop.preheader ]
|
||
|
|
%i = phi i32 [ %i.next, %guarded ], [ 0, %loop.preheader ]
|
||
|
|
%within.bounds = icmp ult i32 %i, %length
|
||
|
|
br i1 %within.bounds, label %guarded, label %not_really_a_deopt, !prof !0
|
||
|
|
|
||
|
|
guarded:
|
||
|
|
%i.i64 = zext i32 %i to i64
|
||
|
|
%array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
|
||
|
|
%array.i = load i32, i32* %array.i.ptr, align 4
|
||
|
|
store i32 0, i32* %array.i.ptr
|
||
|
|
%loop.acc.next = add i32 %loop.acc, %array.i
|
||
|
|
%i.next = add nuw i32 %i, 1
|
||
|
|
%continue = icmp ult i32 %i.next, %n
|
||
|
|
br i1 %continue, label %loop, label %exit
|
||
|
|
|
||
|
|
exit:
|
||
|
|
%result = phi i32 [ %loop.acc.next, %guarded ]
|
||
|
|
ret i32 %result
|
||
|
|
}
|
||
|
|
|
||
|
|
declare void @unknown()
|
||
|
|
|
||
|
|
declare i1 @llvm.experimental.widenable.condition()
|
||
|
|
declare i32 @llvm.experimental.deoptimize.i32(...)
|
||
|
|
|
||
|
|
!0 = !{!"branch_weights", i32 1048576, i32 1}
|
||
|
|
!1 = !{i32 1, i32 -2147483648}
|
||
|
|
!2 = !{i32 0, i32 50}
|