1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 3 2; RUN: llc < %s -mtriple=x86_64-- | FileCheck %s 3 4define void @prefault(ptr noundef %range_start, ptr noundef readnone %range_end) { 5; CHECK-LABEL: prefault: 6; CHECK: # %bb.0: # %entry 7; CHECK-NEXT: cmpq %rsi, %rdi 8; CHECK-NEXT: jae .LBB0_3 9; CHECK-NEXT: .p2align 4 10; CHECK-NEXT: .LBB0_1: # %while.body 11; CHECK-NEXT: # =>This Inner Loop Header: Depth=1 12; CHECK-NEXT: lock orb $0, (%rdi) 13; CHECK-NEXT: addq $4096, %rdi # imm = 0x1000 14; CHECK-NEXT: cmpq %rsi, %rdi 15; CHECK-NEXT: jb .LBB0_1 16; CHECK-NEXT: .LBB0_3: # %while.end 17; CHECK-NEXT: retq 18entry: 19 %cmp3 = icmp ult ptr %range_start, %range_end 20 br i1 %cmp3, label %while.body, label %while.end 21 22while.body: ; preds = %entry, %while.body 23 %start.04 = phi ptr [ %add.ptr, %while.body ], [ %range_start, %entry ] 24 %0 = atomicrmw volatile or ptr %start.04, i8 0 monotonic, align 1 25 %add.ptr = getelementptr inbounds i8, ptr %start.04, i64 4096 26 %cmp = icmp ult ptr %add.ptr, %range_end 27 br i1 %cmp, label %while.body, label %while.end 28 29while.end: ; preds = %while.body, %entry 30 ret void 31} 32