forked from OSchip/llvm-project
80 lines
1.7 KiB
LLVM
80 lines
1.7 KiB
LLVM
; Tests to ensure that we are not placing backedge safepoints in
|
|
; loops which are clearly finite.
|
|
;; RUN: opt %s -place-safepoints -S | FileCheck %s
|
|
|
|
|
|
; A simple counted loop with trivially known range
|
|
define void @test1(i32) gc "statepoint-example" {
|
|
; CHECK-LABEL: test1
|
|
; CHECK-LABEL: entry
|
|
; CHECK: statepoint
|
|
; CHECK-LABEL: loop
|
|
; CHECK-NOT: statepoint
|
|
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%counter = phi i32 [ 0 , %entry ], [ %counter.inc , %loop ]
|
|
%counter.inc = add i32 %counter, 1
|
|
%counter.cmp = icmp slt i32 %counter.inc, 16
|
|
br i1 %counter.cmp, label %loop, label %exit
|
|
|
|
exit:
|
|
ret void
|
|
}
|
|
|
|
; The same counted loop, but with an unknown early exit
|
|
define void @test2(i32) gc "statepoint-example" {
|
|
; CHECK-LABEL: test2
|
|
; CHECK-LABEL: entry
|
|
; CHECK: statepoint
|
|
; CHECK-LABEL: loop
|
|
; CHECK-NOT: statepoint
|
|
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%counter = phi i32 [ 0 , %entry ], [ %counter.inc , %continue ]
|
|
%counter.inc = add i32 %counter, 1
|
|
%counter.cmp = icmp slt i32 %counter.inc, 16
|
|
br i1 undef, label %continue, label %exit
|
|
|
|
continue:
|
|
br i1 %counter.cmp, label %loop, label %exit
|
|
|
|
exit:
|
|
ret void
|
|
}
|
|
|
|
; The range is a 8 bit value and we can't overflow
|
|
define void @test3(i8 %upper) gc "statepoint-example" {
|
|
; CHECK-LABEL: test3
|
|
; CHECK-LABEL: entry
|
|
; CHECK: statepoint
|
|
; CHECK-LABEL: loop
|
|
; CHECK-NOT: statepoint
|
|
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%counter = phi i8 [ 0 , %entry ], [ %counter.inc , %loop ]
|
|
%counter.inc = add nsw i8 %counter, 1
|
|
%counter.cmp = icmp slt i8 %counter.inc, %upper
|
|
br i1 %counter.cmp, label %loop, label %exit
|
|
|
|
exit:
|
|
ret void
|
|
}
|
|
|
|
|
|
; This function is inlined when inserting a poll.
|
|
declare void @do_safepoint()
|
|
define void @gc.safepoint_poll() {
|
|
; CHECK-LABEL: gc.safepoint_poll
|
|
entry:
|
|
call void @do_safepoint()
|
|
ret void
|
|
} |