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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 3
; RUN: llc < %s -mtriple=x86_64-- | FileCheck %s
define void @prefault(ptr noundef %range_start, ptr noundef readnone %range_end) {
; CHECK-LABEL: prefault:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: cmpq %rsi, %rdi
; CHECK-NEXT: jae .LBB0_3
; CHECK-NEXT: .p2align 4
; CHECK-NEXT: .LBB0_1: # %while.body
; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
; CHECK-NEXT: lock orb $0, (%rdi)
; CHECK-NEXT: addq $4096, %rdi # imm = 0x1000
; CHECK-NEXT: cmpq %rsi, %rdi
; CHECK-NEXT: jb .LBB0_1
; CHECK-NEXT: .LBB0_3: # %while.end
; CHECK-NEXT: retq
entry:
%cmp3 = icmp ult ptr %range_start, %range_end
br i1 %cmp3, label %while.body, label %while.end
while.body: ; preds = %entry, %while.body
%start.04 = phi ptr [ %add.ptr, %while.body ], [ %range_start, %entry ]
%0 = atomicrmw volatile or ptr %start.04, i8 0 monotonic, align 1
%add.ptr = getelementptr inbounds i8, ptr %start.04, i64 4096
%cmp = icmp ult ptr %add.ptr, %range_end
br i1 %cmp, label %while.body, label %while.end
while.end: ; preds = %while.body, %entry
ret void
}
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