derek.holloway
7502bf64a4
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32 lines
1.2 KiB
LLVM
32 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 3
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; RUN: llc < %s -mtriple=x86_64-- | FileCheck %s
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define void @prefault(ptr noundef %range_start, ptr noundef readnone %range_end) {
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; CHECK-LABEL: prefault:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: cmpq %rsi, %rdi
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; CHECK-NEXT: jae .LBB0_3
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; CHECK-NEXT: .p2align 4
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; CHECK-NEXT: .LBB0_1: # %while.body
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; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: lock orb $0, (%rdi)
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; CHECK-NEXT: addq $4096, %rdi # imm = 0x1000
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; CHECK-NEXT: cmpq %rsi, %rdi
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; CHECK-NEXT: jb .LBB0_1
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; CHECK-NEXT: .LBB0_3: # %while.end
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; CHECK-NEXT: retq
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entry:
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%cmp3 = icmp ult ptr %range_start, %range_end
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br i1 %cmp3, label %while.body, label %while.end
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while.body: ; preds = %entry, %while.body
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%start.04 = phi ptr [ %add.ptr, %while.body ], [ %range_start, %entry ]
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%0 = atomicrmw volatile or ptr %start.04, i8 0 monotonic, align 1
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%add.ptr = getelementptr inbounds i8, ptr %start.04, i64 4096
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%cmp = icmp ult ptr %add.ptr, %range_end
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br i1 %cmp, label %while.body, label %while.end
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while.end: ; preds = %while.body, %entry
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ret void
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}
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