; 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, 0x90 ; 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 }